Re: [Qgis-user] gridding with a polygon

[Kirk Schmidt via QGIS-User]

Hi Byron:

If I understand this correctly, you are concerned with how the contours 
will be generated at the edge of your raster data.  If I have this 
correct, I would grid the data that you have based on the attribute you 
want to contour.


Create a vector clip layer for your study area that is at least 1 grid 
cell smaller than the the boundary size of the original vector data.


Then create the contours from this new raster and you should be good to go.

Kirk Schmidt

On 5/2/2024 2:07 PM, Byron Veilleux via QGIS-User wrote:

i have a large geologic dataset that i want to grid and contour.
There is an irregular zero edge that bounds these data on one side and
a straight bounding area edge on the other sides.  If i create an 
irregular polygon that encloses these data, is there a way to grid and 
contour such that these data are truncated against the polygon and do 
not extend beyond?

--
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com
Cell:4037108414

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Re: [Qgis-user] Problem with contour algorithm

[Kirk Schmidt via QGIS-User]

Hi Grant:

Based on the other comments,  I tested a shapefile and the following 
GDAL command works


gdal_contour -b 1 -a ELEV -i 10.0 -f "ESRI Shapefile" "K:/Work2/McCallum 
Environmental/Wedgeport/Land Clearing/CHM Clearing.sdat" 
K:/Temp/contour_test.shp


The only difference is that in your example you have /vsimem/xxx.tif.  
There are no double quotes so I do not know if you are using a path 
variable or similar.  I would try an actual path to the tif dem file.


Kirk Schmidt

On 3/13/2024 12:37 AM, Grant Boxer via QGIS-User wrote:


I am trying to contour a grid file using the QGIS raster > 
extract>contour and I get getting errors saying “Warning 1: Model file 
not specified” or “ERROR 4: No such file or directory”.


I am using 3.34 and 3.36 and get the same error.

Any thoughts?

Regards Grant Boxer, Perth WA


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Re: [Qgis-user] Issues Extracting LiDAR From a Tif file to a Golden 7 Software Binary Grid (.GRD)

[Kirk Schmidt via QGIS-User]

Hi Hudson:

I just tried to export to golden 7 binary with QGIS version 3.20 and 
3.28 running on windows 8 and it worked fine.


Kirk

On 2/13/2024 12:27 PM, Hudson Mealy via QGIS-User wrote:

  Hello,

I just purchased a new computer. ROG GEOFORCE RTX STRYX and have 
downloaded QGIS 3.34.3. I was previously using a microsoft surface 
with GQIS 3.26.3. We use QGIS to extract lidar from a large area to 
individual fields (160-700 acres) to be used for drainage 
applications. The large lidar files are uploaded into QGIS in a tif 
file format. From there I use the raster extraction tool and clip 
raster by extent (The field boundary). From there I use the raster 
calculator tool, I choose the file destination which is into the ADMS 
drainage software. I then choose the golden software 7 binary grid 
file type for an output, and in the bottom box I multiply the clipped 
extent by 3.2808 to convert from metres to feet. From here I hit save, 
however QGIS does not respond and no matter how long I leave it it 
will not calculate the operation, I have to force quit the 
application. However, when going back to my old microsft surface 
everything works as normal. I am confused on to what has changed other 
than the newer QGIS download, why is my 5 year old laptop running this 
application without a hitch but my new desktop computer will not 
handle it.


If anyone has any solutions that would be very helpful!

Thanks


--
Hudson Mealy
Impact Tile Drainage
Box 172
Minto, Manitoba
R0K 1M0
204-305-0877
impacttiledrain...@gmail.com

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Re: [Qgis-user] Pansharpening Problem

[Kirk Schmidt via QGIS-User]

Hi Grant:

If you are ending up with null values and zero's, check the values in 
the raster you are pan sharpening against the training or higher 
resolution raster you are using to sharpen. Is there null data in the 
high res raster.  Review the input requirements of the routine to ensure 
the tool will work with your data. Perhaps pan sharpening a 3 channel 
raster with a single channel raster creates the problem.


Kirk Schmidt

On 11/15/2023 9:52 PM, Grant Boxer via QGIS-User wrote:


I am attempting to pansharpen a PRISMA hyperspectral RGB image and I 
am getting areas within the image that are clipped (no data). These 
appear to bands with zero values in two of the three bands. Anyone 
have a work around or suggest how this can be avoided. I am using the 
gdal pansharpen tool and latest release QGIS 3.34.


Cheers Grant

Perth WA


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Re: [Qgis-user] filtering data from highest to lowest in QGIS

[Kirk Schmidt via QGIS-User]

Hi Simon;


Why yes of course you can.  Please see the Filtering in Layer Properties 
section at the following link which provides the basics.



https://mapscaping.com/filtering-in-qgis-a-comprehensive-guide/


You can use the array functions to select and sort attributes as required.


Kirk Schmidt


On 8/17/2023 12:09 PM, Simon via QGIS-User wrote:

Hi all,

Just had a quick question. Is it possible to filter and display the 10 
highest values in a field using the Query Builder or Field calculator?


Thanks,

Simon

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Re: [Qgis-user] Clipping ecw to mask not working

[Kirk Schmidt via QGIS-User]

Hi Michael:

Enhance Compression Wavelet (ECW) is a proprietary compression format.  
I would try exporting your image as a geotiff to see if it is being read 
correctly and does not have internal write protection on it.


Kirk Schmidt

On 7/26/2023 2:02 AM, Michael Dufty via QGIS-User wrote:


I'm having issues trying to clip ecw images to a mask layer.

Using raster-extraction-clip raster to mask layer.

Default parameters.

The tool runs extremely quickly (successfullyin 0.12 seconds), but 
produces a raster entirely black (0,0,0 for all pixels).  With the 
correct extent of the mask layer.


If I tick the box to create an alpha output band it produces an 
entirely transparent result.


Source and mask layers both in EPSG 28350

Anyone else having this issue?  I cannot see any bug reports.

Tried in 328.8, 3.28.9, 3.32.0 and 3.32.1 with same result.

Seems to work fine if input raster is a tif.


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Re: [Qgis-user] YOLO Algorithm on Oil Palm Tree Counting

[Kirk Schmidt via QGIS-User]

Hi Loke;

I know that You Only Look Once (YOLO) is a neural network approach that 
is not very good at detecting small objects in an image.  This may be 
problematic depending on the scale of your plantation image mosiacs.


The image.darknet package in R is a YOLO solver.  It can be implemented 
in QGIS.


Kirk Schmidt

On 7/21/2023 1:17 AM, Loke Jian
 Munn via QGIS-User wrote:


Hi Everyone,

I have been recommended to try YOLO Algorithm on oil palm tree 
recognition and counting. (DSM and Orthomosaic )


Just to ask if someone have any insights of this algorithm and provide 
any reference or guidance ?


Thank you.

*Loke Jian Munn*

Information Technology (IT) Department

*KUALA LUMPUR KEPONG BERHAD*

Wisma Taiko,

No. 1, Jalan S.P. Seenivasagam,

3 Ipoh,Perak Darul Ridzuan,Malaysia

*T : *+605 240 8000 (ext. 2443)

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delete this message and kindly notify the sender.

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Re: [Qgis-user] Reclassify field values from txt rule file in QGIS

[Kirk Schmidt via QGIS-User]

Hi Fabio:


This is GRASS function and you can find an explanation at:

https://www.ibiblio.org/pub/packages/gis/grass/grass63/manuals/html63_user/v.reclass.html

Instead of a simple lookup table, some sql sytax is required.

9110 - (Hainsimsen-Buchenwald)    9110


you would require:


9110

where feature = '9110 - (Hainsimsen-Buchenwald)'or '9110 - 
(Hainsimsen-Buchenwald)(100.0%)' 



Note the single quotations for text.


An easier approach would be top calculate a new field using the field 
calculator and use the string left expression - left(/landclass field/, 4)



Kirk Schmidt

On 6/28/2023 9:52 AM, fabio castelli via QGIS-User wrote:

Dear Qgis users,

I kindly ask for your support with an issue related to the 
reclassification of attribute tables with the v.reclass function.
Here's the link to the question posted on Stackexchenge: 
https://gis.stackexchange.com/questions/462318/reclassify-field-values-from-txt-rule-file-in-qgis


Thank you and best regards,

Fabio Castelli


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Re: [Qgis-user] Qchainage plugin

[Kirk Schmidt via QGIS-User]

Hi Stewart:

You could write a simple script using python or modeler to do what you 
are looking for.  I would reproject to a UTM or similar projection and 
then the math for each segment gets easier.


Reach out to me privately as I have some ideas on how to implement it.

Kirk Schmidt

k...@nortekresources.com

On 3/30/2023 4:56 PM, Stewart Holt via QGIS-User wrote:

Tim,

Depending on how the GPS data was collected for the trail, your line 
shape may be longer than the actual trail. Each GPS point has some 
error and if the points were collected at one per second, the 
additional length caused by points being off the centerline, could be 
significant. GPS height is more noisy with error than the horizontal 
distance. That can contribute a lot of extra length. I use a sub-meter 
GNSS unit and filter the points to be no less than 10 feet apart. I 
add elevation from a USGS layer using the QGIS drape function because 
that is more accurate than the GPS height. By doing this, the 3D 
length is within about 1% as compared to a measuring wheel.


I made the earlier post for work I do for the Appalachian Trail. What 
I want is a way to calculate the 3D distance from one point to the 
next and put the running total in the M value of each point. In my 
case, the layers are in geo coordinates and would require the 
horizontal distance be calculated with lat/lon. I read the 
descriptions of every plugin and determined that nothing currently 
does what I wanted. I am a programmer but have very little Python 
experience. I did get one response which was helpful in writing 
plugins but have not yet pursued it. An example of a plugin which 
takes a vector layer input, does something (or nothing) with it and 
creates an output layer would be a good starting point. If I can 
achieve what I want to do, what you need would be a simple change.


Stewart Holt
Georgia Appalachian Trail Club


On Thu, Mar 30, 2023 at 3:10 PM Tim Fearn via QGIS-User 
 wrote:


Hi everyone,
I’m trying to use the qchainage plugin to create ½ mile markers
along a vector line that represents a trail.  The line is a single
feature with no multi-parts or dangles.  It is about 318 miles
long so I would expect right around 636 points if there is one
every half mile.  My project default is set to miles for length
measurements as is the qgis main preference. I set the unit
measurement to miles and input .5 as the interval.  I continually
get 771 points instead of the expected 636.  Also when I use the
automatic labeling feature of the plugin it appears to be in
degrees not an aggregate mileage.

     Several weeks ago a fellow had queried the list on the same
subject.  He was working with the Appalachian Trail I believe and
wanted to place points at given distances.  No one seemed to
really understand so I’m hoping that if anyone remembers the
original poster, and has come up with any thoughts or other ideas
it would be much appreciated.  This is something that can be done
for sure.  All of the National Scenic Trail maps in this country
are demarcated with some form of mile or half mile makers which
when labeled show the accumulated distance.

     Hoping for some traction on this.  I’ve only just started
learning python so I wouldn’t describe myself as a programer and
am looking for a relatively simple solution.

With much gratitude,

Tim Fearn
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Re: [Qgis-user] Shape Tools New Capabilities - Compass cardinal directions

[Kirk Schmidt via QGIS-User]

Nice Update Calvin.

What is your 0 or 360 degree reference?  I assume it is grid north if 
you use a projected coordinate system.


Kirk Schmidt

On 3/10/2023 8:04 AM, C Hamilton via QGIS-User wrote:
I thought I would highlight a couple of updates to the Shape Tools 
plugin. For those who are not aware, Shape Tools has a measuring tool 
that not only includes the distance from point A to B, but also 
displays the azimuth from A to B and from B to A. It shows each 
segment with these features and the total distance. It also has a 
measurement layer algorithm that creates a new layer from a polygon or 
line layer with already styled measurements of the line segments.


The recent addition is to also include the compass cardinal directions 
such as N, S, E, W or NE, WSW, or NEbE depending on the number of 
compass points that are selected. This has to be enabled from 
Vector->Shape Tools->Settings and then look for "Points of the 
compass" and you can select None, 4, 8, 16, or 32. It defaults to None.


The other addition is a related expression function with some examples

st_compass( azimuth[, number_of_points, mode] )

st_compass(33) → 'NNE'
st_compass(33, 8) → 'NE'
st_compass(33, 32) → 'NEbN'
st_compass(33, 16,'full') → 'north-northeast'
st_compass(33, 32,'full') → 'northeast by north'
st_compass(33, 32,'trad') → 'Quarto di Greco verso Tramontana'

Enjoy,

Calvin

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Re: [Qgis-user] LIDAR

[Kirk Schmidt via QGIS-User]

Hi Allan:

One way is to combine the files into a super file which may not be an 
option due to size.  The other would be to find the total range of z 
values in your project area and set the min and max symbology for the Z 
attribute.  while using the attributes by ramp option.  You can save the 
style and use it for the remaining point clouds.


Kirk Schmidt

On 2/13/2023 11:49 PM, Allan Younger via QGIS-User wrote:

Hi everyone,
I have multiple Lidar downloaded las files, on opening find each has 
its individual range of levels.

How can I shade uniform levels?
 200m plus points in several of blocks.
Chrs
AY



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Re: [Qgis-user] Mapa de visibilidad

[Kirk Schmidt via QGIS-User]

Hi Sara:

It depends what you mean by automatically. You can create a static 
viewshed of one or several points and click on a location to see if any 
or all are visible.  If you want to select a point and do the 
calculation on the fly, that is a different process and would take a bit 
of thinking on how to implement it.


The Visibility Analysis plugin will give you the functionality I 
described first.


Kirk Schmidt


On 1/11/2023 10:06 AM, Sara Gómez Zaragozà via QGIS-User wrote:

Buenos días,

Mi nombre es Sara Gómez, y querría preguntarles sobre una cuestión 
relacionada con la aplicación del QGIS (versión 3.8 para MAC OS X 
Capitan 10.11.6). Para generar un mapa de cuencas visuales de 
determinados elementos del paisaje (en este caso, arte rupestre o 
yacimientos arqueológicos) es posible que el programa marcando un 
punto en el mapa nos pudiera marcar los elementos que se visualizan 
desde este punto de forma automática?


Gracias, un saludo


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Re: [Qgis-user] Issues with SAGA's tools

[Kirk Schmidt via Qgis-user]

Hi Lucas;

Try installing SAGA as a stand alone and run the tool.  I use this tool 
regularly and it works fine.


Kirk Schmidt

On 4/19/2022 8:58 AM, Lucas Pomares via Qgis-user wrote:


Hello,

I’m trying to use fill sinks tool (Wang & Liu) of SAGA in Qgis 
Toolbox. However, when the process ends the program fails and doesn´t 
generate the result layers. I´ve tried it using different versions of 
Qgis (3.16 , 3.20 and 3.24) but I couldn´t solve the problem. SAGA 
version is 7.8.2. I also tried to uninstall and reinstall the program 
and I didn´t achieve.


I tried to solve it by myself but I don´t know where is the problem 
and would want to ask if anyone knows how to solve it.


I attach a picture of the fail and the log file in txt.

In English says that:

The following layers doesn´t generate correctly.

• 
C:/Users/Lucas/AppData/Local/Temp/processing_vRdlpU/1ee9a17ddce54df9967efcee956d7b95/FDIR.sdat


• 
C:/Users/Lucas/AppData/Local/Temp/processing_vRdlpU/83bae0d547e5462290b9d6530fb03bf3/WSHED.sdat


• 
C:/Users/Lucas/AppData/Local/Temp/processing_vRdlpU/a7ad2897f43e4c7bbfff4898a4a2cc07/FILLED.sdat


You can look the << register message panel>> in main window of Qgis 
for more information about algorithm.


Thank for the help!!

*Lucas Pomares Zambrano*

*Dpto. Ingeniería*

GEOLÉN

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Re: [Qgis-user] shapefile import error

[Kirk Schmidt via Qgis-user]

Hi David

Just to Clarify Richards comments.  A shape file is a collection of 
files, all with the same prefix.  At a minimum, you should have 3 files, 
*.shp, *.shx and *.dbf.  There may also be a few more files as well 
depending on how the file was created.  You may just have the  *.shp 
file which is creating the error.


Kirk Schmidt

On 3/3/2022 3:24 PM, Richard Greenwood via Qgis-user wrote:

Do you have the "side car" files .shx and .dbf and possibly others?

On Thu, Mar 3, 2022 at 9:31 AM David Witton  wrote:

Hello

I'm pointing the Data source Manager|Vector at a .shp file and
getting the error "Invalid Data Source". The file exists on an
external drive, and the path is valid - any ideas on what could be
causing this?

-- 
David Witton

307 413 2072
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Re: [Qgis-user] Labeling Lines with Bearings

[Kirk Schmidt]

Hi Springfield:

You can place the python code in the 
C:\Users\User\AppData\Roaming\QGIS\QGIS3\profiles\default\processing\scripts 
folder on your local machine and then it will show up under scripts in 
the processing toolbox.


Kirk Schmidt

On 2/10/2022 4:03 AM, Springfield Harrison wrote:


Hello Everyone,

Thanks very much for the suggestions.  The main_angle option seem to 
do the trick.


I didn't try the Python code.  Not familiar with that side of things 
although it is probably simple enough.  Could not find the recipe for 
adding it to the plug-in list, which I presume is where it is supposed 
to go.


Thanks again, very helpful…


Cheers, Spring


On 04/Feb/2022 07:10, Kirk Schmidt wrote:


Hi Springfield:


Sure it would , I have attached my little convergence tool. Just 
create a point in the area where you want to know the convergence at 
let her rip.  The vary last column is the convergence in minutes.  
So, depending on what side of the central meridian of your coordinate 
system you are, it will either be negative or positive. SO, I just 
used it yesterday for and area that is east of the meridian, UTM 
easting > 500,000,   therefore the resulting convergence was 22 
minutes, which need to be subtracted from the grid north value to 
obtain true north.  It is not a sophisticated workflow, but I only 
require it intermittently.


I usually use NRCAN magnetic declination calculator (online) to 
verify the magnetic declination for the day.  But it seems to be 
offline. I convert everything to magnetic for field work and then 
there are no mistakes due to declination calculations and settings.


Have fun

Kirk

On 2/4/2022 6:34 AM, Springfield Harrison wrote:


Aha, thanks Kirk.  That's why my lines are not as I intended.  This 
probably affects making the lines with the Shape Tool.


Yes, it seems to draw in grid north, angle_main reports in True DD.  
The map is 26907, UTM 7N.


I calculated the difference between as drawn and as reported and 
used that to change the input figure.  It works OK, not exact as the 
convergence varies with longitude, I believe.


Thanks Kirk . . . .


Cheers, Spring
On 03/Feb/2022 02:59, kirk wrote:





Sent from my Galaxy


 Original message 
From: kirk 
Date: 2022-02-03 5:55 a.m. (GMT-04:00)
To: Springfield Harrison , 
qgis-user@lists.osgeo.org

Subject: RE: [Qgis-user] Labeling Lines with Bearings

Hi Spingfield.

I use a little routine and the core if it is:

main_angle($geometry) which you can use in field calculator.

Note this will give you the azimuth in relation to grid north for 
the coordinate system you are using.  For projections, you will 
need to lookup or calculate convergence to get the adjustment to 
true north.


Kirk Schmidt



Sent from my Galaxy


 Original message 
From: Springfield Harrison 
Date: 2022-02-02 7:30 p.m. (GMT-04:00)
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Labeling Lines with Bearings

Hello,

I need to put the line direction (azimuth) into a line label. Some
searching has not come up with anything.

Is there a way?  Thanks very much . . . .


Cheers, Spring



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Re: [Qgis-user] Adding alpha band to raster

[Kirk Schmidt]

Hi Nicolas:

I just had an idea, why not use gdal directly?   I know gdalwarp has a 
-dstalpha switch to code null data Assuming this is what you want the 
alpha band for)


Kirk


On 1/21/2022 6:06 PM, Nicolas Cadieux wrote:

Hi,

I don't see it in the current processing algorithms. I see lot's or 
r.out... but not that one:(  I guess I could do it in Grass...


Thanks for the idea!

Nicolas

On 2022-01-21 1:37 p.m., Kirk Schmidt wrote:

Hi Nicholas:

Try r.out.gdal

https://grass.osgeo.org/grass78/manuals/r.out.gdal.html

Kirk Schmidt


On 1/21/2022 2:25 PM, Nicolas Cadieux wrote:

Hi,

What is the easiest way, in QGIS3, to add an alpha band to a 
raster?  Alpha bands are handy with the georeferencer. Currently, I 
am just adding it in GIMP before I start the georeferencer.


Thanks


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Re: [Qgis-user] Adding alpha band to raster

[Kirk Schmidt]

Hi Nicholas:

Try r.out.gdal

https://grass.osgeo.org/grass78/manuals/r.out.gdal.html

Kirk Schmidt


On 1/21/2022 2:25 PM, Nicolas Cadieux wrote:

Hi,

What is the easiest way, in QGIS3, to add an alpha band to a raster?  
Alpha bands are handy with the georeferencer.  Currently, I am just 
adding it in GIMP before I start the georeferencer.


Thanks


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B0K 1W0
Tel (902) 922.3607
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Re: [Qgis-user] QGIS Modeling, using an model input layer name

[Kirk Schmidt]

Hi Nicolas

The field calculator will not process raster data.  Try using the raster 
calculator


Kirk Schmidt

On 1/7/2022 2:56 PM, Nicolas Cadieux wrote:

Hi,

I can figure this on out!!!  I want to use the layer name of the input 
layer (a raster) as value for the field calculator.


layer_property(@Inputraster , 'name')  does not work.  Any suggestions?

Thanks


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Re: [Qgis-user] SAGA Issues

[Kirk Schmidt]

Hi All:

My short term work around is to run simple batch files (windows 
environment) to handle the saga processing.  Not very elegant, but it 
gets the job done.  Be aware that different SAGA versions may have 
different syntax.


Kirk Schmidt

On 1/4/2022 3:48 PM, i...@jcis.net.au wrote:


I am certainly not an expert,  but the SAGA issue has been discussed 
by the redoubtable Hans van der Kwast in a video in the QGIS Open Day 
session on Processing Provider plugins: https://youtu.be/9fWQZqPjPVk . 
I believe the issue lies with more recent versions  of QGIS using a 
more recent version of SAGA but SAGA not being integrated into QGIS in 
the way it previously was.


All sorts of QGIS Gurus are discussing this and at some point the 
clouds will open and a stone tablet will be issued.



It would be really great to have a fix for tis issue as the SAGA tools 
are really useful.


Cheers

*Dr Iain Stuart*

*/JCIS Consultants /*

P.O. Box 2397

Burwood North

NSW, 2134

(02) 9701 0191
(0413) 380116 (m)


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Re: [Qgis-user] Create new coverage

[Kirk Schmidt]

Hi Paddy:

The easiest approach would be to generate a new grid using the extents 
of your existing grid an defined at the 5 degree resolution.


Select Vector> Research Tools>Create Grid and follow the prompts.

Kirk Schmidt

On 11/3/2021 10:54 AM, Pat Brown wrote:

Hi,
  I have a shapefile which consists of a grid (polygons), each of 
which is 1 quarter degree in extent. I would like to create a second 
coverage where each polygon is again subdivided into smaller polygons, 
each being 5 degrees by 5 degrees in extent. Essentially each degree 
square would consist of 144 polygons.

 Appreciate any suggestions, thanks,

Paddy

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Re: [Qgis-user] Batch Aerial Imagery GeoReferencing

[Kirk Schmidt]

Hi Richard:

It sounds like you are in the world of  manually georeferencing or ortho 
creation.   This would entail identifying ground control points for each 
image and processing.


Assuming you do not need all 6000 images at one time, you could tag each 
image to its central location and then ortho or geo it if it is needed.


Kirk

On 11/3/2021 7:45 AM, John Layt wrote:

Hi Richard,

The Historic England aerial photography team have been working on a 
similar sort of project which they recently released (see 
https://historicengland.org.uk/whats-new/news/new-virtual-aerial-map-allows-everyone-to-explore-englands-archaeology-from-the-air/). 
Perhaps they might be able to provide some advice on how they did it? 
There's an email address at 
https://historicengland.org.uk/research/methods/airborne-remote-sensing/.


Cheers!

John.


On Wed, 3 Nov 2021 at 10:27, Richard McDonnell 
 wrote:


Hi Kirk and Charles,

Thanks for your reply. This is what we know…

CAMERA:    Wild RC8 and RC10 152mm Focal Length.

ALTITUDE:    4,560m with Block Adjustments for
Mountainous areas

IMAGE OVERLAP: 60% along track 25% side lap and all
flight line Orientations East – West except for offshore.

Im afraid though that GPS just wasn’t a thing when these images
where captured. We have been looking at reverse geotagging the
Images, that is we know there location…ish and we can convert them
to jpegs with EXIF values assigned in theory.

Though the biggest issue is, in talking on the guys on the Open
Drone Mapper forum, our overlaps aren’t sufficient for SFM, so an
automated process will be out of the question.

Once again, thanks for getting back, if you can think of anything
else, please let me know.

Regards,


Richard


——
Richard McDonnell MSc GIS, FME Certified Professional
/FRM Data Management/

——
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964 T +353 46 942 2409
https://gov.ie/opw

——
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Email Disclaimer:
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*From:*Qgis-user  *On Behalf Of
*Kirk Schmidt
*Sent:* 01 November 2021 12:59
*To:* qgis-user@lists.osgeo.org
*Subject:* Re: [Qgis-user] Batch Aerial Imagery GeoReferencing

Hi Richard:

You would require a couple of things:

1) Camera interior orientation which would include the lens
calibration

2) exterior orientation which would include precise coordinate at
time of exposure as well as the pitch, roll and yaw of the camera.

3) the offsets from the camera film or sensor center to the center
of the aircraft gps antenna.

4) an accurate DEM or your target area

If you have the above data, you can autoreference your images.

If the images have a high endlap and sidelap, you could use
commercial software such as Pix4D or  Global Mapper to
orthorectify the images based on structure from motion.  Check
into drone orthorectification software.

Kirk

On 10/29/2021 9:13 AM, Richard McDonnell wrote:

Afternoon all,

I have access to over 6000 Aerial Images covering Ireland, we
also have scans of the Flight Paths and Image Orientation and
Extents (Scans from Paper Maps)

What I was wondering is if there is a way to Batch
Georeference all of these Images?

Any Ideas, help, guidance welcome. I have thought about maybe
even reverse engineering the Flight Plan, then using
OpenDroneMap to georeference the Images.

Regards & Thanks,

Richard McDonnell

*
——*
*Richard McDonnell MSc GIS, FME Certified Professional*
/FRM Data Management/

——
*Oifig na nOibreacha Poiblí*
Office of Public Works

*Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36 *
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964 T +353 46 942 2409
https://gov.ie/opw <https://gov.ie/opw>

——
To send me files larger than 30MB, please use the link below
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<https://filetransfer.opw.ie/filedrop/richard.mcdonn...@opw.ie>

Email Disclaimer:
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Re: [Qgis-user] Batch Aerial Imagery GeoReferencing

[Kirk Schmidt]

Hi Richard:

You would require a couple of things:

1) Camera interior orientation which would include the lens calibration

2) exterior orientation which would include precise coordinate at time 
of exposure as well as the pitch, roll and yaw of the camera.


3) the offsets from the camera film or sensor center to the center of 
the aircraft gps antenna.


4) an accurate DEM or your target area

If you have the above data, you can autoreference your images.

If the images have a high endlap and sidelap, you could use commercial 
software such as Pix4D or  Global Mapper to orthorectify the images 
based on structure from motion.  Check into drone orthorectification 
software.


Kirk



On 10/29/2021 9:13 AM, Richard McDonnell wrote:


Afternoon all,

I have access to over 6000 Aerial Images covering Ireland, we also 
have scans of the Flight Paths and Image Orientation and Extents 
(Scans from Paper Maps)


What I was wondering is if there is a way to Batch Georeference all of 
these Images?


Any Ideas, help, guidance welcome. I have thought about maybe even 
reverse engineering the Flight Plan, then using OpenDroneMap to 
georeference the Images.


Regards & Thanks,

Richard McDonnell


——
Richard McDonnell MSc GIS, FME Certified Professional
/FRM Data Management/

——
Oifig na nOibreacha Poiblí
Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964 T +353 46 942 2409
https://gov.ie/opw

——
To send me files larger than 30MB, please use the link below 
https://filetransfer.opw.ie/filedrop/richard.mcdonn...@opw.ie


Email Disclaimer: 
https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/



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Re: [Qgis-user] georeferencing and displaying lat long.

[Kirk Schmidt]

Hi Byron:

So if you want to great a grid/graticule , the simplest way is to set 
the map view to your desired coordinate reference system (EPSG:4326 for 
example).  If you have some data that you can add to the map canvas that 
covers you can add it to use as the extent of the new graticule.   You 
can set the extent of the grid from either; calcutate from an existing 
layer, using the  current map canvas extent, or you can draw a box in 
the canvas.


To add the graticule, select Vector>Research Tools> Create Grid and fill 
out the parameters.


Kirk Schmidt


On 10/1/2021 2:30 PM, Firstname Lastname wrote:


i have several maps to georeference that have reference grid in 
lat/long.  can someone please tell me how to display the coordinate 
grid in lat long on the map so that i get some nice grid lines for 
reference.  actually, knowing how to post the reference lines in any 
coordinate system would be helpful.

--
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
by...@conjugategeo.com <mailto:by...@conjugategeo.com>
Cell:4037108414

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Re: [Qgis-user] ordinary kriging parameters

[Kirk Schmidt]

Hi Maria:

Just from the cuff, the units are pixels or meters.  Try reprojecting 
your source data to a projected coordinate system (UTM, for example) and 
try kriging again.  Set the raster resolution to a course value that 
makes sense for your data to run a test raster and then run at the final 
resolution you require if you are concerned with processing time.



By using geographic corrdinates, you probably were generating a hugh 
raster which caused your computer to hang.



Kirk Schmidt

On 9/30/2021 3:03 PM, Maria Eugenia Gomez wrote:

Hi,
I am using QGIS 3.16.9 Hannover. I want to create a surface (with 
kriging) from a list of points whose SRC is WGS84. They are in decimal 
degrees covering a surface of 10km x 9km. I can see the points correctly-


My problem comes with the "Ordinary Kriging" setup. I unchecked "block 
kriging" and used the following options:

quality measure: stand. dev.
Logarithmic transf.
variogram model: linear
fit:nodes
search range: local
search directions: all directions
number of points: max. number of points

But when I have to fill "cell size", "maximum search distance, block 
size.. etc", I do not understand the units and I think this is the 
problem. Which type of units should I use? I tried to use decimal 
degrees units but then the number of iterations was so high that my 
computer hangs.


Can somebody help me with this? I searched on the QGIS documentation 
but it does not say anything about units.

Thanks in advance,
Maria


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Re: [Qgis-user] QGIS on a mobile platform

[Kirk Schmidt]

Josh:

Another option is to use Avenza Maps (commercial) to view your 
georeferenced pdf's directly on a phone or tablet.  This makes a simple 
to use mobil solution that does not require an intenet connection


Kirk

On 9/10/2021 2:02 PM, Greg Troxel wrote:

If you just want something that will show a georeferenced and your
current look at viking and gpsd.  I am not sure if it does
georerferenced pdf, but am 99% sure it will do geotiff.  I use it with
openstreetmap TMS for looking at tracks.

I don't know if any of that works on windows, but with cygwin/X I would
expect it would.  Maybe someone knows of a less-posixy approach.

You probably could just run qgis and use live gps, but that may be too
heavy for your win7-32 box.

Your subject said "mobile" which usually means phone/tablet.  Not what
you asked, but there are various qgis-world apps: input, qfield, SMASH
that might do you what want, and Trail Sense on android, which can just
about do georeferenced pdf, if the pdf is in web mercator, but I'm
having a hard time with qgis-produced maps.

Also not what you asked, but if anyone knows of a command-line tool to
just print out the georeferencing information from a pdf and check it
for conformance, please let me know, and it could be useful to Josh in
debugging next steps too.

Greg

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Re: [Qgis-user] How can I export Vector & Raster layers together to import into mapshaper

[Kirk Schmidt]

Hi Kris;

I am not familiar with MapShaper, however, the vector data and the 
raster layer (Openstreetmap) are fundamentally different animals.  You 
could:


1) generate a geopackage which can store both raster and vector data 
types, but I do not know if you can read such a database with mapshaper?


2) create a map using print composer and export the vector and raster 
components as a georeferenced image or pdf file.  This export a pretty 
map but you would lose all the feature attributes of your vector layer.


Kirk

Kirk Schmidt, MScF, BScF, RPF
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On 8/12/2021 10:40 AM, Kris Lagocki wrote:
My issue seems to be with the raster layer, can't seem to figure out 
how to have it export together with the vector layer.


On Thu, Aug 12, 2021 at 5:27 AM Richard McDonnell 
mailto:richard.mcdonn...@opw.ie>> wrote:


Hi,

There is a TopoJSON Writer Plugin available for QGIS, you might
give that a try. It should write the vector dataset out as
TopoKSON for you.

Regards,


Richard


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To send me files larger than 30MB, please use the link below
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*From:*Qgis-user mailto:qgis-user-boun...@lists.osgeo.org>> *On Behalf Of *Kris
Lagocki
*Sent:* 11 August 2021 14:32
*To:* qgis-user@lists.osgeo.org <mailto:qgis-user@lists.osgeo.org>
*Subject:* [Qgis-user] How can I export Vector & Raster layers
together to import into mapshaper

Hi - I created a shape file using QGIS with a US Postal Code shape
file that I found on the Census website and joined it with a data
file listing the Postal Codes and which Sales Territory they
belong to.  I added in a raster layer OpenStreetMap.  I'd like to
export both layers together and import them into mapshaper so that
I can export as Topojson.  It has to be in this format to use
within Power BI.  Has anyone accomplished this?  Any help is
appreciated.  Thanks.


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Re: [Qgis-user] Did scale change outputting to PDF?

[Kirk Schmidt]

Hi All:

I always add a scale bar to a printed map so that if there is variaition 
between the pdf/print configuration, It can always be confirmed on the 
final printed map.


Kirk Schmidt

On 5/27/2021 4:27 AM, j.hu...@post-ist-da.de wrote:

Hi John,

as I understand it, you created the base map in QGIS. If you use the 
measure tool in QGIS to get the distance between two distinct features 
in the map (e.g. road intersections) and then measure the same 
distance on the printed base map with a ruler, it should be possible 
to calculate the scale. Maybe use two distances, one aligned more or 
less horizontally and one vertically, to check if the scaling is 
proportional.


As Andreas pointed out, it is probably a problem with the settings 
when the PDF was printed. In my experience it is a good idea to go to 
print shops usually working for architects and engineers since they 
are familiar with the importance of scaling (for advertising etc. it 
is more important that the whole content is printed, so that scaling 
might be used to fit the output to the printable area without 
potential cropping).
You can print directly to a plotter in QGIS if you have access to the 
device, avoiding the PDF detour.


EPSG 2264 should be fine. Units should be US feet.

Regards
Jochen


Am 27.05.21 um 07:15 schrieb John Antkowiak:
Hi. This plan was too simple to fail - but it failed. The charity 
whose project this is needed a large (that is... massive) paper wall 
map on which to plot and rethink its delivery driver assignments. 
Both drivers and delivery addresses are subject to change from week 
to week but it's not a pizza delivery; this is a regular run to 
supply people in a bad way. So the plan was to print the base map 
(roads and road names and county boundaries only) and then print 8.5 
x 11 address maps with parcel data and orthos. That way, the base 
maps don't change but the physical parcel layer is flexible. (On top 
of that is a third paper layer indicating which drivers go where so 
someone can stand back and take in the whole picture graphically. Not 
a cutting-edge state of the digital art solution, but not everyone is 
cut out for that. It is what it is.) In order for this to work, the 
parcel maps have to be the same scale as the base map. Which they 
were... in QGIS.


We have to convert all the maps to PDF to print them, and we had to 
send the base map PDFs to FedEx/Kinkos to print the 9 map grid panels 
at 42" by 62" each.


When we got the big base maps up on the wall, we discovered the scale 
did not match the 8.5" x 11" parcel maps output to PDF and printed 
from home. It's not off by a lot, but it's enough to be painfully 
obvious from a single standard size sheet of paper. I don't know how 
to reverse engineer the big map scale precisely enough to enter a new 
scale number in the QGIS Print Layout. I didn't foresee it because 
this never would've been a conceivable scenario at the engineering 
firm where I picked up my meager GIS skills. (ArcMap sent a map 
directly to the plotter without interim steps.) There was no scale 
bar on the map. It shouldn't have been needed for this.


Did something happen to the map scale when QGIS output the map to 
PDF? Could the size of the image on the pdf page have been adjusted 
manually or otherwise when being sent to a plotter with 42" paper? 
Could the image have been distorted horizontally differently from 
vertically? For the life of me, I cannot trial-and-error guess at a 
scale to enter. I've gone through dozens of new 8.5" x 11" test maps 
trying to guess the correct scale.


Any ideas?

Thank you all -

John A.

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Re: [Qgis-user] Aerial photo dates in legend without RGB patches?

[Kirk Schmidt]

Hi Michael:

Just to be clear, these are your own georeferenced aerial photo's or 
professionally produced ortho photo's (as opposed to satellite 
imagery).  If so, where would the date field come from, the name of the 
image files or perhaps embedded in the geotiff header (if using this 
file type)?


Kirk Schmidt


On 5/25/2021 10:22 AM, Michael Dufty wrote:


Has anyone got a good solution to display aerial photo dates in the 
legend?


I can change the name of the layer, but then it displays a huge 
useless R G B legend.  Is there any way to turn this off?  Setting the 
patch size to 0 doesn’t seem to be possible for local images, although 
it does work for WMS layers.


Alternatively is there a way to just put a manual line of text in the 
legend, other than with dummy layers/groups?


*Michael Dufty*


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Re: [Qgis-user] Model Designer - Updating Field in Place

[Kirk Schmidt]

Hi Ryan;

Yes, you would run a selection on then table first, apply the updates 
and save. If you require interactive selection criteria, you can use a 
number or string in input in your model. The user will then define them 
when it is run.  Look under the vector selection Algorithms for select 
and/or extract functions in the process modeler



Kirk Schmidt

On 5/17/2021 11:27 AM, ryanpeel wrote:

Perfect!  It worked!

And would you know how to set up model designer to have the model input to
choose only selected rows versus whole table?



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Re: [Qgis-user] Model Designer - Updating Field in Place

[Kirk Schmidt]

Hi Ryan;

There is a network plugin which may solve your issue.

see 
https://gis.stackexchange.com/questions/279650/processing-modeler-to-update-table


Kirk Schmidt

On 5/17/2021 10:50 AM, Ryan Peel wrote:

Hello,

I have created a new Model in Model Designer and I'm using a Point 
Layer as Input and a Field Calculator that calls a custom function.  I 
would like the output/result of the field calculator to update an 
existing field in the attribute table.


I cannot get this to work.  I can only get it to output a new 
temporary scratch table.


Is my idea possible?

--

Sincerely,
Ryan

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Re: [Qgis-user] validatore topologico Qgis3

[Kirk Schmidt]

Hi Elisa:

This may be best answered by the plugin developer.  I am not familiar 
with that plugin but you can use the grass module v.clean or in process 
modeler to fix topological errors.


Kirk Schmidt

On 5/12/2021 12:45 PM, Elisa Franchi wrote:


Buongiorno a tutti,

ho notato che il plugin validatore topologico Qgis3 non rileva 
correttamente gli errori: segnala errori che sulla versione Qgis2 non 
ci sono e non ne segnala altri che in Qgis2 vengono rilevati.


Ci sono impostazioni particolari da fare rispetto alla versione di Qgis2?

Elisa

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Re: [Qgis-user] (no subject)

[Kirk Schmidt]

Hi jean:

Another issue is that you can set your elevation reference point in most 
Garmin units to either use the height above the ellipsoid or and 
approximation mean sea level.  This setting will also have an impact on 
your observed elevation.


Kirk Schmidt


On 4/20/2021 8:45 PM, jean Lukusa wrote:

Hi all .
I hope you are doing fine.
I have experienced an issue:
The elevation taken in the field with gps garmin64 is 623 m but the 
one given by SRTM download from Qgis is 612m.

How can I interprete this gap knowing that SRTM resolution is 30 meters.

Jean Lukusa
B.Sc. Geology
Trained on Jorc  Code
GIS  Operator
+243812156128

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Re: [Qgis-user] QGIS-3 single line/point layers from hand-written co-ordinates

[Kirk Schmidt]

Hi John:

Yes, life is too short to waste time.  I would add the lat/long into a 
spreadsheet or simple ascii text file.  This way, you can double check 
your entries and once you are ready, you can bring them into QGIS as a 
*.txt or *.csv file.


A simple text format would be :

1,45.3741, -62.1548

where 1 is the point id and the next is the longitude and latitude.  
These values are separated by a comma, however a semi colon or tab would 
work as well.  You can also reverse the lat/long if it is easier for you.


Instructions on how to import the file and convert it to a spatila layer 
are found at: (I know, another tutorial)


https://www.qgistutorials.com/en/docs/3/importing_spreadsheets_csv.html

If your coordinates are in degrees/minutes, you can use them as well.  
Reach out to me and I can give you the correct syntax if you need it.


Kirk Schmidt

On 4/19/2021 11:36 AM, John Moyle wrote:
I am a retired Chartered Engineer, Physician and Anaesthetist!. In 
retirement I have completed a PhD "The Maintenance of the Victorian 
Submarine Telegraph Cable System".  I want to correlate N Atlantic 
cable interruptions with geological events of that era. I have found a 
raster-file of the sea bed and a shape file of the tectonic plate 
boundaries. Fantastic! Now I want to make separate point or line 
layers for each interruption, volcano, earthquake and landslide.  I 
have all the data in lat/long, hand written in a notebook whilst 
searching the archives at the National Maritime Museum.
My problem is that all QGIS-3 courses take  many hours turning one 
into a town and country planner before the simple layers I want to 
make!  At 75, life is too short. I want to input the co-ordinates, by 
hand, layer by layer. Can anyone give me step by step instructions please.

Thank you
John Moyle



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Re: [Qgis-user] Help! QGIS crashed and has deleted my QGZ file

[Kirk Schmidt]

Hi John:

I am sorry to hear about your crash.  It is important to note that QGIS 
provides a means of querying, updating, analysing and displaying data 
that is stored outside of the software (in a variety of formats).  SO, I 
would suggest looking for the actual spatial files(s) that you were 
editing when it crashed.  I assume they still exist, however, depending 
on the data format, you probably would have lost the attributes you were 
editing at the time of the crash.


The QGIS project file may also have been corrupted at the time of the 
crash.  You may have to use a backup to restore your last saved version.


I hope this helps

Kirk Schmidt

On 4/19/2021 9:56 AM, j...@john-firth-editor.co.uk wrote:


I’m using QGIS 3.16.0 on Windows 10, standalone PC. I have taken some 
training, but am a pretty inexpert user. The map that I’ve spent 
several months developing (for a book I’m writing) crashed on 
Saturday, and when I tried to load it just now it is greyed out in the 
Open Recent list (with an exclamation mark next to it) and File 
Explorer no longer finds it on my hard disk.


I attempted to do what your website advised (downloaded DeBug View, 
which did not appear to run on my computer). When the file crashed, I 
had just added a couple of entries to an attribute table (it’s not a 
large one, though there are others in the file). I’ve no doubt someone 
more expert than I am could tell me how to extract a crash report, if 
that would be helpful.


Is there any chance of saving my map?



John Firth

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Re: [Qgis-user] Generate the bearing in the attribute table

[Kirk Schmidt]

Hi Carlos;

It seems you have the calculation of azimuth figured out.  I would 
generate a new filed in the attribute table and use the field calculator 
to calculate your bearings. If you are comfortable with python, you can 
create a script as well.


If you are using a projected coordinate system, take note that North 
would be actually be grid north and your calculate azimuth would be in 
relation to it.  If you want to reference actual true north, you would 
have to calculate the convergence between true and grid north for your 
project area.  If you want the coordinates referencing magnetic north 
(perhaps for field work), then you would also have to calculate the 
magnetic declination for your project.


    Kirk Schmidt

On 4/8/2021 6:30 PM, Sebastian Gutwein wrote:

Carlos-
Interesting problem-
You might get better responses on stack exchange.
I have the same confusion as Ujaval. Each side of your polygon will 
have a different bearing.
If all you care about is the average angle then you can use this 
expression  main_angle( $geometry)

This will return azimuth of the polygon in degrees from north.
I don't know how to convert this to bearing in QGIS.



On Thu, Apr 8, 2021 at 3:28 PM carlos h <mailto:carloslda...@gmail.com>> wrote:



  Hello, for example have this in the attribute table:

https://ibb.co/wWn4PfM <https://ibb.co/wWn4PfM>

What I need is to have the bearing in the polygon's attribute table.

  Thanks

CA




image.gif
El jue, 8 abr 2021 a las 10:49, Ujaval Gandhi
(mailto:uja...@spatialthoughts.com>>) escribió:

Can you elaborate with an example? It's not clear what the
bearing would be for a polygon.
Logo <https://spatialthoughts.com/>   
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On Thu, Apr 8, 2021 at 8:50 PM carlos h
mailto:carloslda...@gmail.com>>
wrote:


Hello, nice to write here.

How can I generate the bearing in the attribute table
of a polygon? the bearing not in azimuth, but for
example N30E etc

Thanks

CA


image.gif
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Re: [Qgis-user] off topic Deimos 2 images

[Kirk Schmidt]

Hi Carlos:

I just looked at the technical specifications for DEIMOS-2 data and data 
are available at 2 processing levels, L1B and L1C, both of which are 
calibrated and radiometrically corrected.  The L1C level data are 
orthorectified.


So your data is most likely already corrected if you purhased it from a 
vendor.


Kirk Schmidt

On 4/4/2021 7:13 PM, carlos h wrote:
Hello, a pleasure to greet you, has someone carried out atmospheric 
correction of images of deimos 2?


Thanks

CA

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Re: [Qgis-user] off topic Deimos 2 images

[Kirk Schmidt]

Hi Carlos:

Do you have the calibration files?  These are usually available from the 
data provider.


Kirk Schmidt

On 4/4/2021 7:13 PM, carlos h wrote:

deimos 2


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Re: [Qgis-user] How to access r.series command

[Kirk Schmidt]

Hi Jeff:

Under the top right word menu, click on Processing>Toolbox to activate 
the toolbox which will appear on the right hand side of the canvas.  Add 
r.series to the search window, or navigate to grass> raster>r.series


If grass is not activated, left click the tool icon in the processing 
toolbox.  Look under providers and activate Grass.


Kirk Schmidt


On 3/30/2021 1:19 PM, gafna jeff wrote:

Hello everyone,
I would like to sum up pixel values of several raster layers using the 
r.series command but I don't seem to know where to find it on QGIS 
after loading all my rasters. I would appreciate any help

Jeff

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Re: [Qgis-user] First steps with 3D Scan Data?

[Kirk Schmidt]

Hi Bernd:

Just a clarification on LAStools.  The library has open as well as 
licensed algorithms. Typically, the basic functionality is available for 
free and implemented in QGIS.  The advanced tools are available through 
licensing.  Rapidlasso GmbH also developed the laz format which is an 
efficient compression standard to make large datasets/point clouds more 
manageable.


PDAL and R can be used to process the data but if your data is 
compressed, you would have to use  the unlicensed Laszip routine 
available in QGIS 3.x to convert the data to an uncompressed las format.


Kirk





On 3/26/2021 6:23 AM, Karl Magnus Jönsson wrote:

Hi!
Lots of suggestions here. But if I understand you correct it is lidar data and 
all about photogrammetry is not in question. Why not pdal? Open source, 
powerful and what QGIS is using in 3.18.

https://pdal.io/

Karl-Magnus


-Ursprungligt meddelande-
Från: Qgis-user  För Bernd Vogelgesang
Skickat: den 26 mars 2021 09:35
Till: Benoit de Cabissole ; qgis-user 

Ämne: Re: [Qgis-user] First steps with 3D Scan Data?

Hi Benoit,

ok, thanks. las then.

But when I read about the lastools plugin, the description says that I need to 
install the lastools software, and the website there tells me that the license 
is about 1500€ which is a little too much for some learning efforts.

Any other options?

Cheers,

Bernd


On 26.03.21 09:28, Benoit de Cabissole wrote:

Hi Bernd,

OK, that more info!

The files are likely to be in Timble RealWorks format.
So you will have to get your contractor to provide you with .las
files, otherwise your stuck buying RealWorks!
Or, perhaps, the viewer is able to export in .las??

When you get las files, you can use lastools plugin for QGIS to
process them.

Cheers,
Benoit


On 26/03/2021 10:01, Bernd Vogelgesang wrote:

Hi Benoit,

as I was not present when the scans were made, I can only assume that
this was a laser scanner on a tripod.

With the sent data, there is a Trimble Scan Explorer Viewer software
where I can make a "virtual walk" through the scene, so there have to
be photos but also laser scan data as I can see from different view modes.

As I said, this is the very first time I get in touch with this
stuff, and Google was of no big help so far.

Besides of tons of other files, the bigger ones with around 50 to 80
MB are .rwcx and .tzf files.
I hoped that someone would know what these file explicitly hold, and
what I have to do to get them e.g. into QGIS or other open source
software.

Cheers,

Bernd

On 26.03.21 08:40, info wrote:

Hi Bernd,

Well, could you give more info? E.g. what kind of scan:
laser/lidar/photo/other? This will influence your workflow.

+/-Open source laser/lidar could be based on lastools [1]
Open source photogrammetry could be based on AliceVision meshroom
[2,3],  MeshLab [4] and blender [5]

In photogrammetry: Agisoft metashape [6] and pix4D [7] as good
commercial products.

BTW: 32 scans, if photos, is quite a very low number of photos for
reconstructing a 3D scene!

Hope this helps.
Cheers,
Benoit de Cabissole

[1] http://lastools.org/
[2] https://alicevision.org/#photogrammetry
[3] https://github.com/alicevision/meshroom
[4] https://www.meshlab.net/
[5] https://www.blender.org/
[6] https://www.agisoft.com/
[7] https://www.pix4d.com/



On 25/03/2021 23:07, Bernd Vogelgesang wrote:

Hi folks,

in a project on a former dumpside now to be transformed into a sand
lizard habitat, I saw the chance to get my hands dirty for the
first time on 3D scan data (terrestrial). I received 10GB of stuff,
and now I'm completely lost.

The data consists of .rwcx files, .tzf files and lots of other stuff.

Is there any chance that I can process any of this data with an
open source stack?
Or what should be done, to make them digestible?

Second step: There seem to be 32 different scans of the area form
all angles. In case I succeed to somehow load the data, how do I
combine them ?

For the first steps, I actually "only" would like to generate a
decent DEM from the data to be able to place some features on a map
for the guys in charge to do the habitat stuff.

Any kind of hints or links to reads about this topic would be
appreciated

Cheers,

Bernd


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Re: [Qgis-user] Learning resources/books for QGIS

[Kirk Schmidt]

Hi Rod:

I would suggest a video to get a feel for how things work. Things are a 
lot easier without command level inputs.  Try:


https://www.youtube.com/watch?v=kCnNWyl9qSE

There are lots of resources on youtube.

Kirk Schmidt

On 3/12/2021 1:39 PM, Roderick Anderson wrote:

Good day.

I looking for some suggestions of books on learning QGIS.

I have some background (very long ago - late 80's / early 90's) with 
GIS but at that time is was more about mapping not analysis.


In fact, I am looking to use QGIS for building maps for personal use. 
Something along the lines of the Washington state (US) "Map Your 
Neighborhood" project.  The ability to easily load personal data is 
important.


For me the QGIS Documentation assumes a more current knowledge of the 
technology and terminology than I have.


I've looked at the QGIS book selections but not quite sure which would 
the best for my needs.


Any and all suggestions are welcome.


TIA,
Rod


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Re: [Qgis-user] Combing Vector Layers - With Attributes

[Kirk Schmidt]

Hi Springer

You could try joining the databases using a common field assuming the 
second one does not have new point features.  However, I expect you are 
adding new point features.


In that case, I usually write a little python script to generate a new 
set of features in the update layer that matches those of the master 
layer.  I then recalculate the values of the new features before 
dropping the initial set of fields. You can use Graphical Modeler to 
generate a model and access through the Processing Toolbox> Models Group.


If you send me to sample shapefiles, I can put it together if you are 
not familiar with the Graphical Modeler.


Kirk Schmidt

On 3/12/2021 4:35 AM, Springfield Harrison wrote:

Hello All,

I have a master database (point shapefile) of trees to which I need to 
add new records frequently.  The two files have different (but 
similar) attribute lists.  I need to combine them and add the new 
attributes into the appropriate SHP database columns.


Copying and pasting records from the new file into the master list 
does work but if the fields are not identical, no attributes are 
brought into the master file.


Is there a way to import the new records into their corresponding 
fields in the master file?


I've searched for help on this to no avail.  Manifold GIS handles this 
very well, setting up a field matching dialogue but I would prefer to 
keep the process within QGIS.


Thanks very much for any ideas . . . .

-
Cheers, Springfield Harrison



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Re: [Qgis-user] Georeferencer GDAL - Tool - What is the meaning of the scaling factor in the Info

[Kirk Schmidt]

Hallo Michael:

I assume you are referring to the parameters in the lower part of the 
georeferencing window? I qset up a test georeferencing and the screen 
shot is below.


In this case, the values are the transformation parameters based on the 
4 GCP's I used.  The value after the | are the coordinates of the cursor 
measured from the top left corner.


Is this what you are referring too?

If the values are in your main map view, something has gone wrong in 
your georefrencing and perhaps you do not have enough GCP or one of your 
coorinates is wrong.  Try overlaying some additional vector or raster 
data to confirm your image is in the right spot.


Kirk Schmidt

On 3/11/2021 10:47 AM, Michael Werner Maur wrote:

Hello,


I use the Georeferencer in the QGis Raster dialog för a long time. But 
yet I need further and detailed information about the quality 
parameters of the  transformation.


For example I did a Helmert Transformation and find in the lower part 
of my desktop the parameters. There are two scaling factors for each 
coordinate axis, but they  are as the following value (0,05325...) 
...I expected something in relation to the original scale of the 
scanned raster map (f.e. 1 : 1250 -> 0,0008).


It will be very helpful, if there is a explanation to it ! Thanx a lot !




Mit freundlichen Grüßen
Im Auftrag
Michael Maur

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Re: [Qgis-user] Trimble GeoXT 2005 Accuracy

[Kirk Schmidt]

Hi Springfield:

PPP requires long observation times in the order of hours and therefore 
a new field survey.  I would try post processing from a high precision 
site with your existing data.


Another issue may be the aviation antennae you mentioned.  These are 
usually mounted on the top of a fuselage and therefore the aluminum acts 
as a ground plane to effectively filter out multipath.  If you use a 
metal disk or plate and a ground plane on your antennae and mount it on 
a tripod, you may find you end up with better results.  You will notice 
survey grade antennae's have a large diameter plastic case since the 
contain an internal 10 cm metal disk.


Kirk Schmidt

On 3/9/2021 1:36 PM, Springfield Harrison wrote:

Hello Garth,

Thanks very much for that reference.  I have used the service in the 
past.


I'm in the middle of other work but may try to re-process some Map A 
files using PPP to see what changes.


Your work sounds more like surveying than mapping, interesting.

I do use the GPS reception planning tools but SV availability is 
certainly better than in the early days.


Thanks again . . . .

-
Cheers, Spring



On 09/Mar/2021 09:01, Garth Fletcher wrote:

Nicolas Cadieux wrote:
Kirk could be on the right track.  You could try PPP using this 
site.  You will need to create a user name and password.  Then, you 
upload the Rinex file.   I am 99% sure you can process point from 
outside of Canada. 


I routinely use CSRS PPP to post process RINEX files from Southern New
Hampshire (43°N, 72°W).

Using an iGage iG3s (L1/L2 dual frequency, GPS + GLONASS) recording at
5 second epochs in forested areas, from post processing I get
 30 minute recordings, 95% error ellipses < 1 meter
 10 hour recordings,   95% error ellipses < 2 cm

CSRS-PPP site is
<https://webapp.geod.nrcan.gc.ca/geod/tools-outils/ppp.php?locale=en>
enter your email address
select Static and which NAD 83 epoch you want, or ITRF
Submit a RINEX file (.zip compressing the file is encouraged)
they will email back a detailed report

You can submit for 1 of 3 levels of post processing
 ultra-rapid : submit > 90 minutes after end of recording
 rapid: submit > 24 hours after end of recording
 final:  submit ~ 3 weeks after end of recording

Major part of corrections are in ultra-rapid, the higher levels provide
further refinements.


FYI: Trimble provides occupation planning aids at
<https://www.gnssplanning.com/#/charts>
just enter your location and date and it shows you the DOP as
a function of the hour of day.

Cordially,

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Re: [Qgis-user] Lidar download

[Kirk Schmidt]

Hi Jean:

I am not sure what you are looking for?

Do you want to download a lidar derived image (such as a surface model) 
or do you want to work with raw  point cloud data?


Kirk Schmidt

On 3/4/2021 8:41 AM, jean Lukusa wrote:

Hi all ,
how Can I download Lidar image from  Qgis 3.18.0 ?

Jean Lukusa
B.Sc. Geology
Trained on Jorc  Code
GIS  Operator
+243812156128

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Re: [Qgis-user] contours and symbology

[Kirk Schmidt]

Hi Saber:

You can do this directly in symbology. See link below, Use Rule Based 
Symbology and "Elev" % 100= 0 to separate all the contours that are 
multiples of 100.  Set your line symbols and you should be good to go.


https://gis.stackexchange.com/questions/259875/styling-contours-at-specific-numbers


Kirk Schmidt

On 3/3/2021 2:15 PM, Saber Razmjooei wrote:

Hi Azzurra,

You can use Raster styling to display it as contours with minor and 
major contours:
https://www.qgis.org/en/site/forusers/visualchangelog314/index.html#feature-raster-layer-contour-renderer 
<https://www.qgis.org/en/site/forusers/visualchangelog314/index.html#feature-raster-layer-contour-renderer>


Kind regards
Saber

On Wed, 3 Mar 2021 at 18:01, Azzurra Lentini <mailto:azzurralent...@gmail.com>> wrote:


Hi to all,

I have extracted contours from a dtm raster 20 m resolution file
and the result is a vector file of contours with 20 m of interval
between the contours.

I would like to have two different symbols for these contours: for
example black colour and thickness 1 for the contours with
interval of 100 m (0, 100, 200, 300 etc.) and grey colour and
thickness 0.5 for the contours 20, 40, 60, 80, 120, 140 .. etc.).

What can I do?

Normally I create another contours file only for the contours
equidistant 100 m and I put a different symbol for the 2 layers.

Do you know other ways without the creation of another file?
maybe rule-based symbology?


Thank you, Azzurra


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Re: [Qgis-user] raster with distance values from a point

[Kirk Schmidt]

Hi Nicholas:

If you activate the various providers under the Processing toolbox 
options, you can have direct access to the various algorithms I 
mentioned.  I often generate a quick general model, export as a python 
script and then refine the script as required.


I am running 3.16.2-Hannover.

Kirk

On 2/25/2021 9:26 PM, Nicolas Cadieux wrote:


Interesting Kirk,

The QGIS vector to raster conversion is not available in the graphical 
modeler or do you have another reason behind your solution? I don’t 
use much the graphical modeler so I appreciate your incite.


Cheers!

Nicolas Cadieux
https://gitlab.com/njacadieux <https://gitlab.com/njacadieux>

Le 25 févr. 2021 à 15:44, Kirk Schmidt  a 
écrit :




To add to Nicolas" comment:

1) Create your point layer from a csv (easting, northing id) as a minimum

2) If you want to stay with process modeler, use the SAGA>Raster 
creation tools> Rasterize Algorithm to convert the point layer to 
your required resolution and size


3) Use the  GDAL>Raster Analysis>Proximity or SAGA>Raster tools> 
Proximity Raster  to create your output.


Kirk Schmidt

On 2/25/2021 4:24 PM, Nicolas Cadieux wrote:


Hi,

You can cut down you use of several plugins by doing the following,

1) Create a vector point file with a single point having the 
numerical field containing the value 1. This file could be a csv 
containing WKT.


2) Use the vector to raster conversion.  (This will take your vector 
point file, an create a raster of x,y dimensions.  You point will 
become 1 and all other values will be 0.


3) Use the Proximity raster distance gdal function.

This requires no plugins so it should be easy to create a graphical 
modeler.  My favorite way would be to go to strait Python and to 
call the gdal proximity function from my Python script.  If you had 
hundred or thousands of these to do, I could develop a Python script 
that could automate the entire thing.   Contact me if you have 
questions.


Nicolas Cadieux


On 2021-02-25 12:58 p.m., Fabio Falchi wrote:


Dear all,

not having received any answer, I repeat the request.
I need to speed up the process of obtaining rasters with distances 
from a single point (or a single lat-lon coordinate) in it. 
Manually I use this procedure:
With a georeferenced raster in a UTM projection I use raster 
calculator to obtain a raster with all pixels set to zero. Then, 
with Serval plug-in, I manually set to 1 the value of the pixel in 
the wanted position (either by using a satellite overlay or by 
using a point vector layer with the appropriate coordinates). Then 
I use the proximity function under Raster>Analisys menu.
I want to make this via the Graphical Modeler, in order to be able 
to make the process fast and skip the manual introduction with 
Serval plug-in. At the very least, I need a mode to put the value 1 
in the pixel of the selected null raster in the position givel by 
lat-lon coordinates.

Thank you!
Best,
Fabio Falchi

/USC - Universidade de Santiago de Compostela/

/ISTIL - Light Pollution Science and Technology Institute/


Il sabato 20 febbraio 2021, 18:04:14 CET, Fabio Falchi 
 ha scritto:



Dear all,

I need to speed up the process of obtaining rasters with distances 
from a single point in it. Manually I use this procedure:
With a georeferenced raster in a UTM projection I use raster 
calculator to obtain a raster with all pixels set to zero. Then, 
with Serval plug-in, I manually set to 1 the value of the pixel in 
the wanted position (either by using a satellite overlay or by 
using a point vector layer with the appropriate coordinates). Then 
I use the proximity function under Raster>Analisys menu.
I want to make this via the Graphical Modeler, in order to be able 
to make the process fast and skip the manual introduction with 
Serval plug-in. At the very least, I need a mode to put the value 1 
in the pixel of the selected null raster in the position givel by 
lat-lon coordinates.

Thank you!
Best,
Fabio Falchi

/USC - Universidade de Santiago de Compostela/

/ISTIL - Light Pollution Science and Technology Institute/


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Re: [Qgis-user] raster with distance values from a point

[Kirk Schmidt]

To add to Nicolas" comment:

1) Create your point layer from a csv (easting, northing id) as a minimum

2) If you want to stay with process modeler, use the SAGA>Raster 
creation tools> Rasterize Algorithm to convert the point layer to your 
required resolution and size


3) Use the  GDAL>Raster Analysis>Proximity or SAGA>Raster tools> 
Proximity Raster  to create your output.


Kirk Schmidt

On 2/25/2021 4:24 PM, Nicolas Cadieux wrote:


Hi,

You can cut down you use of several plugins by doing the following,

1) Create a vector point file with a single point having the numerical 
field containing the value 1.  This file could be a csv containing WKT.


2) Use the vector to raster conversion.  (This will take your vector 
point file, an create a raster of x,y dimensions.  You point will 
become 1 and all other values will be 0.


3) Use the Proximity raster distance gdal function.

This requires no plugins so it should be easy to create a graphical 
modeler.  My favorite way would be to go to strait Python and to call 
the gdal proximity function from my Python script.  If you had hundred 
or thousands of these to do, I could develop a Python script that 
could automate the entire thing. Contact me if you have questions.


Nicolas Cadieux


On 2021-02-25 12:58 p.m., Fabio Falchi wrote:


Dear all,

not having received any answer, I repeat the request.
I need to speed up the process of obtaining rasters with distances 
from a single point (or a single lat-lon coordinate) in it. Manually 
I use this procedure:
With a georeferenced raster in a UTM projection I use raster 
calculator to obtain a raster with all pixels set to zero. Then, with 
Serval plug-in, I manually set to 1 the value of the pixel in the 
wanted position (either by using a satellite overlay or by using a 
point vector layer with the appropriate coordinates). Then I use the 
proximity function under Raster>Analisys menu.
I want to make this via the Graphical Modeler, in order to be able to 
make the process fast and skip the manual introduction with Serval 
plug-in. At the very least, I need a mode to put the value 1 in the 
pixel of the selected null raster in the position givel by lat-lon 
coordinates.

Thank you!
Best,
Fabio Falchi

/USC - Universidade de Santiago de Compostela/

/ISTIL - Light Pollution Science and Technology Institute/


Il sabato 20 febbraio 2021, 18:04:14 CET, Fabio Falchi 
 ha scritto:



Dear all,

I need to speed up the process of obtaining rasters with distances 
from a single point in it. Manually I use this procedure:
With a georeferenced raster in a UTM projection I use raster 
calculator to obtain a raster with all pixels set to zero. Then, with 
Serval plug-in, I manually set to 1 the value of the pixel in the 
wanted position (either by using a satellite overlay or by using a 
point vector layer with the appropriate coordinates). Then I use the 
proximity function under Raster>Analisys menu.
I want to make this via the Graphical Modeler, in order to be able to 
make the process fast and skip the manual introduction with Serval 
plug-in. At the very least, I need a mode to put the value 1 in the 
pixel of the selected null raster in the position givel by lat-lon 
coordinates.

Thank you!
Best,
Fabio Falchi

/USC - Universidade de Santiago de Compostela/

/ISTIL - Light Pollution Science and Technology Institute/


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Re: [Qgis-user] raster with distance values from a point

[Kirk Schmidt]

Hallo Fabio:

What version of QGIS are you using?

Kirk Schmidt

On 2/25/2021 1:58 PM, Fabio Falchi wrote:


Dear all,

not having received any answer, I repeat the request.
I need to speed up the process of obtaining rasters with distances 
from a single point (or a single lat-lon coordinate) in it. Manually I 
use this procedure:
With a georeferenced raster in a UTM projection I use raster 
calculator to obtain a raster with all pixels set to zero. Then, with 
Serval plug-in, I manually set to 1 the value of the pixel in the 
wanted position (either by using a satellite overlay or by using a 
point vector layer with the appropriate coordinates). Then I use the 
proximity function under Raster>Analisys menu.
I want to make this via the Graphical Modeler, in order to be able to 
make the process fast and skip the manual introduction with Serval 
plug-in. At the very least, I need a mode to put the value 1 in the 
pixel of the selected null raster in the position givel by lat-lon 
coordinates.

Thank you!
Best,
Fabio Falchi

/USC - Universidade de Santiago de Compostela/

/ISTIL - Light Pollution Science and Technology Institute/


Il sabato 20 febbraio 2021, 18:04:14 CET, Fabio Falchi 
 ha scritto:



Dear all,

I need to speed up the process of obtaining rasters with distances 
from a single point in it. Manually I use this procedure:
With a georeferenced raster in a UTM projection I use raster 
calculator to obtain a raster with all pixels set to zero. Then, with 
Serval plug-in, I manually set to 1 the value of the pixel in the 
wanted position (either by using a satellite overlay or by using a 
point vector layer with the appropriate coordinates). Then I use the 
proximity function under Raster>Analisys menu.
I want to make this via the Graphical Modeler, in order to be able to 
make the process fast and skip the manual introduction with Serval 
plug-in. At the very least, I need a mode to put the value 1 in the 
pixel of the selected null raster in the position givel by lat-lon 
coordinates.

Thank you!
Best,
Fabio Falchi

/USC - Universidade de Santiago de Compostela/

/ISTIL - Light Pollution Science and Technology Institute/


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Re: [Qgis-user] MrSIS Import Reference File Problem

[Kirk Schmidt]

Hi Baz:

Do not click on the sdw file but the actual MrSID image file.  It will 
look for the world file and load appropriately.


Kirk

On 2/1/2021 8:08 PM, bazza_05.excite wrote:

I am an absolute newbie to QGIS  but have used other GIS programs.

I have tried to import a MrSID rater file with a correlating world file (.sdw) 
by using the menu path: Layer - Add Layer - Add Raster Layer.
I navigate to the folder where the file resides that also contains the .sdw and 
when I click on add I get a CRS error and the image does not go to its proper 
coordinates and defaults to near 0,0

The project reference is NAD 83 UTM Z12 N (ESPG 26912) which is the same as the 
image world file.

Is there a correct method to insert the image file?

I am on version 3.16.2

Cheers,
Baz

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Re: [Qgis-user] Volume calculation - Reg

[Kirk Schmidt]

Hi Mike:

I usually convert the contours or breaklines into a point layer and then 
generate a dem from that.  This is not a precise methodology but it 
would depend on what you are trying to do and the precision of the 
underlying data.


Kirk Schmidt

On 12/18/2020 5:28 AM, Michael Dufty wrote:


The links for Nicolas are quite useful, but I think to create a raster 
DEM from vector lines you probably need to use the interpolate 
triangulation with breaklines or structure lines.


The dialogue takes a bit of getting used to, you need to choose the 
layer the data will come from, click + then in the box below choose 
whether the layer is being used for points, breaklines or structure lines.


I’ve had major issues with the interpolation crashing QGIS if I try to 
used it with breaklines for complex imported data, but it seems to 
work OK for simple test geometries, and may be good for a simple 
excavation.


I’d be interested to know if anyone has had success with interpolation 
using breaklines for more complex data, I’ve had to resort to other 
software trying to import DEM supplied as dxf 3d faces, but maybe I’m 
missing a basic step like fixing geometry or removing duplicates.


*From:*Qgis-user  *On Behalf Of 
*Nicolas Cadieux

*Sent:* Friday, 18 December 2020 12:04 AM
*To:* Abhi Shek 
*Cc:* qgis-user@lists.osgeo.org
*Subject:* Re: [Qgis-user] Volume calculation - Reg

This should help

https://youtu.be/EerXfUf-aHo <https://youtu.be/EerXfUf-aHo>

https://www.pointsnorthgis.ca/blog/how-to-calculate-surfacecut-volume-qgis-advanced/ 
<https://www.pointsnorthgis.ca/blog/how-to-calculate-surfacecut-volume-qgis-advanced/>


Nicolas Cadieux

https://gitlab.com/njacadieux <https://gitlab.com/njacadieux>



Le 17 déc. 2020 à 04:57, Abhi Shek mailto:psn.abhis...@gmail.com>> a écrit :



Sir,

I invite your kind attention to the above subject. I am a beginner
in qgis.

I want to create a raster DEM using Vector Lines.

In a nutshell, I want to calculate the planned excavated volume.

please guide me in this matter.

-- 


with warm regards,
P S N Abhishek,

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Re: [Qgis-user] Import mapinfo tabfile

[Kirk Schmidt]

Hi Jean:

The tab file is what you need to open.  The other files make up the rest 
of the components of the vector file similar to a shapefile.  You can 
either drag and drop the tab file into and open QGIS canvas or use the 
add vector layer button.  If you use the later, you can select the file 
type to Mapinfo and the suitable files will be displayed (*.TAB files).


Kirk Schmidt

On 12/17/2020 7:34 AM, Weijers, Jean (Kerkrade) wrote:


Hello

I got  mapinfo files (.DAT, .ID, .MAP, .TAB).

I want to import this into QGIS, but I don’t get a vectorfile. I see 
only TAB-file.


How can I convert the tab-files into vectorfiles.

Does anaone have a solution.

Thanks in advance,

Jean Weijers


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Re: [Qgis-user] [X] Re: Trying to use the v.split to break down a Polyline into 2 point segment to add feet label.

[Kirk Schmidt]

Hi Mark:

The issue appears to be with the group permissions within your network 
that is creating the issue.   The routine starts, run into a write 
issue, then shuts down.  I suspect it is write permission to the 
local\temp folder.


"This program is blocked by group policy. For more information, contact 
your system administrator."


Kirk


On 12/11/2020 3:29 PM, Wolf, Mark wrote:

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Re: [Qgis-user] R: Importing a raster into a Geopackage

[Kirk Schmidt]

Hi Nicolas:

I reached out to Alberto for the original data as the one on google 
drive did not contain georeferencing and therefore would not write to a 
geopackage.  I tried to write the geopackafge from Alberto's data and I 
generated 3 bands.  I just got back from a meeting and I will play with 
it some more.


Kirk

On 12/2/2020 12:10 PM, Nicolas Cadieux wrote:

Hi Alberto,

Can I share the file and your question in the gdal dev group?  Perhaps 
they will have an answer to your problem. You can also do that 
yourself if you prefer.


Kirt, if you have time, can you do the same run with the data in my 
google link?  If you can’t duplicate the problem, then we will have a 
better idea if you share your QGIS version and OS. Perhaps there is 
change in the gdal version between both computers.


Nicolas Cadieux
https://gitlab.com/njacadieux <https://gitlab.com/njacadieux>

Le 2 déc. 2020 à 10:11, Alberto Vavassori 
 a écrit :




Hi Kirk,

I tried with another raster file that represents a temperature 
distribution (continuous values). In this case, when I import it into 
the Geopackage, I see the same issue that you have just described: 
minimum and maximum values in the legend change, but it seems that 
the actual values remain unchanged, thus correct. Unfortunately this 
is not the case of the land cover raster (discrete set of values) 
that I have shared with you: in this case, the raster characteristics 
change, as we have all noticed.


Just another question, hoping that you might have an answer: is it 
possible to store the symbology of a raster file inside the 
Geopackage? I know that it is possible for vector data, by clicking 
on “Style > Save style” in the “Symbology” tab. But I cannot find a 
way to save the symbology in case of raster files.


Thanks a lot.

Alberto

*Da:* Qgis-user  *Per conto di 
*Kirk Schmidt

*Inviato:* mercoledì 2 dicembre 2020 16:00
*A:* Nicolas Cadieux ; 
qgis-user@lists.osgeo.org

*Oggetto:* Re: [Qgis-user] R: Importing a raster into a Geopackage

Hi all:

I ran the r.stats to get a list of each pixel value on my test data 
(A small DEM) before and after conversion to a geopackage (see second 
image below). The values and summary stats are identical for the two 
rasters but the default legend entry has a different min and maximum 
value.  So, I can conclude that the data is being written correctly 
but the default display parameters for the geopackage  are different 
than a geotiff.


Kirk




On 12/1/2020 3:24 PM, Nicolas Cadieux wrote:

Hi,

I changed the link so you have access to more files.


https://drive.google.com/drive/folders/1fMl9odowUFFRQFK61rTxgHeom_D8ymN6?usp=sharing

<https://drive.google.com/drive/folders/1fMl9odowUFFRQFK61rTxgHeom_D8ymN6?usp=sharing>

Nicolas

On 2020-12-01 1:58 p.m., Kirk Schmidt wrote:

Hi Nicolas

I did the same and the legend indicates a change magnitude
but if I subtract the geopackage raster from the original,
all pixels equal zero.

Kirk

On 12/1/2020 2:36 PM, Nicolas Cadieux wrote:

Hi,

Tried this:

gdal_translate -of GPKG -b 1
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif
C:/Users/Nicolas/Desktop/test.gpkg

I read 4 band and still get data modifications.

Nicolas

On 2020-12-01 1:28 p.m., Kirk Schmidt wrote:

Hi Nicolas:

try the -b 1 parameter.  I just tried this and wrote
a single band raster from a 3 channel tiff.

Kirk

On 12/1/2020 2:03 PM, Nicolas Cadieux wrote:

I tried

gdal_translate -of GPKG -co "BAND_COUNT=1"
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif
C:/Users/Nicolas/Desktop/TEST.gpkg for the
creation and

C:\>gdal_translate -of GPKG -co "TILE_FORMAT =
TIFF"
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif
C:/Users/Nicolas/Desktop/TEST.gpkg

Same problem.  I wonder if we need to change the
reading options...
https://gdal.org/drivers/raster/gpkg.html
<https://gdal.org/drivers/raster/gpkg.html>


"Opening options

By default, the driver will expose a GeoPackage
dataset as a four band (Red,Green, Blue,Alpha)
dataset, which gives the maximum compatibility
with the various encodings of tiles that can be
stored. It is possible to specify an explicit
number of bands with the BAND_COUNT opening option."

The problem could be when QGIS Reads the file,
not when it writes 

Re: [Qgis-user] R: Importing a raster into a Geopackage

[Kirk Schmidt]

Hi all:

I ran the r.stats to get a list of each pixel value on my test data (A 
small DEM) before and after conversion to a geopackage (see second image 
below).  The values and summary stats are identical for the two rasters 
but the default legend entry has a different min and maximum value.  So, 
I can conclude that the data is being written correctly but the default 
display parameters for the geopackage  are different than a geotiff.


Kirk


On 12/1/2020 3:24 PM, Nicolas Cadieux wrote:


Hi,

I changed the link so you have access to more files.

https://drive.google.com/drive/folders/1fMl9odowUFFRQFK61rTxgHeom_D8ymN6?usp=sharing

Nicolas

On 2020-12-01 1:58 p.m., Kirk Schmidt wrote:


Hi Nicolas

I did the same and the legend indicates a change magnitude but if I 
subtract the geopackage raster from the original, all pixels equal zero.


Kirk

On 12/1/2020 2:36 PM, Nicolas Cadieux wrote:


Hi,

Tried this:

gdal_translate -of GPKG -b 1 
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif 
C:/Users/Nicolas/Desktop/test.gpkg


I read 4 band and still get data modifications.

Nicolas

On 2020-12-01 1:28 p.m., Kirk Schmidt wrote:


Hi Nicolas:

try the -b 1 parameter.  I just tried this and wrote a single band 
raster from a 3 channel tiff.


Kirk

On 12/1/2020 2:03 PM, Nicolas Cadieux wrote:


I tried

gdal_translate -of GPKG -co "BAND_COUNT=1" 
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif 
C:/Users/Nicolas/Desktop/TEST.gpkg for the creation and


C:\>gdal_translate -of GPKG -co "TILE_FORMAT = TIFF" 
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif 
C:/Users/Nicolas/Desktop/TEST.gpkg


Same problem.  I wonder if we need to change the reading 
options... https://gdal.org/drivers/raster/gpkg.html



"Opening options

By default, the driver will expose a GeoPackage dataset as a four 
band (Red,Green, Blue,Alpha) dataset, which gives the maximum 
compatibility with the various encodings of tiles that can be 
stored. It is possible to specify an explicit number of bands with 
the BAND_COUNT opening option."


The problem could be when QGIS Reads the file, not when it writes 
the file.  I explains why we see 4 bands but not why values are 
changing.  I would make a bug report or ask the question on the 
gdal dev group to get Even Rouault's attention.


Nicolas


On 2020-12-01 12:17 p.m., Sebastian Gutwein wrote:
This looks like the same issue you are having. 
github.com/qgis/QGIS/issues/38227 
<http://github.com/qgis/QGIS/issues/38227>
According to the documentation linked in the issue you need to 
set the band count to 1 otherwise it defaults to 4.
gdal.org/drivers/raster/gpkg.html 
<http://gdal.org/drivers/raster/gpkg.html>

I have not tried this to see if it works.

On Tue, Dec 1, 2020 at 11:52 AM Nicolas Cadieux 
<mailto:njacadieux.git...@gmail.com>> wrote:


Hi,

Looking at it now.  I see what you see.  I will try a few things.

Nicolas

On 2020-12-01 11:42 a.m., Alberto Vavassori wrote:


Hi Nicolas,

thank you for the answer. I send the raster that I am
interested in.

Alberto

*Da:*Nicolas Cadieux 
<mailto:njacadieux.git...@gmail.com>
*Inviato:* martedì 1 dicembre 2020 17:40
*A:* Alberto Vavassori 
<mailto:alberto.vavass...@polimi.it>
*Cc:* qgis-user@lists.osgeo.org
<mailto:qgis-user@lists.osgeo.org>
*Oggetto:* Re: [Qgis-user] Importing a raster into a Geopackage

Hi,

Send a sample data set if you can't figure it out.

Nicolas

On 2020-12-01 10:35 a.m., Nicolas Cadieux wrote:

Hi,

Perhaps this can help:
https://gdal.orgdrivers/raster/gpkg.html
<https://gdal.orgdrivers/raster/gpkg.html>

“Various kind of input datasets can be converted to
GeoPackage raster :

·Single band grey level

·Single band with R,G,B or R,G,B,A color table

·Two bands: first band with grey level, second band with
alpha channel

·Three bands: Red, Green, Blue

·Four band: Red, Green, Blue, Alpha

GeoPackage rasters only support Byte data type.”

My guess is that if the original raster does not
correspond to one of the categories above, it will be
converted to the closest format.

Nicolas Cadieux

https://gitlab.com/njacadieux
<https://gitlab.com/njacadieux>



Le 1 déc. 2020 à 09:58, Alberto Vavassori

<mailto:alberto.vavass...@polimi.it> a écrit :



Hello everybody. I have an issue regarding the
Geopackage format. I have tried to import a
singleband raster file (it represents the land
cover, thus every pixel has a single integer value
corresponding to the land cover class), but this
operation seems to modify the raster
characteristics: the raste

Re: [Qgis-user] R: Importing a raster into a Geopackage

[Kirk Schmidt]

Hi Nicolas

I did the same and the legend indicates a change magnitude but if I 
subtract the geopackage raster from the original, all pixels equal zero.


Kirk

On 12/1/2020 2:36 PM, Nicolas Cadieux wrote:


Hi,

Tried this:

gdal_translate -of GPKG -b 1 
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif 
C:/Users/Nicolas/Desktop/test.gpkg


I read 4 band and still get data modifications.

Nicolas

On 2020-12-01 1:28 p.m., Kirk Schmidt wrote:


Hi Nicolas:

try the -b 1 parameter.  I just tried this and wrote a single band 
raster from a 3 channel tiff.


Kirk

On 12/1/2020 2:03 PM, Nicolas Cadieux wrote:


I tried

gdal_translate -of GPKG -co "BAND_COUNT=1" 
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif 
C:/Users/Nicolas/Desktop/TEST.gpkg for the creation and


C:\>gdal_translate -of GPKG -co "TILE_FORMAT = TIFF" 
C:/Users/Nicolas/Desktop/Land_cover_Corine2018.tif 
C:/Users/Nicolas/Desktop/TEST.gpkg


Same problem.  I wonder if we need to change the reading options... 
https://gdal.org/drivers/raster/gpkg.html



"Opening options

By default, the driver will expose a GeoPackage dataset as a four 
band (Red,Green, Blue,Alpha) dataset, which gives the maximum 
compatibility with the various encodings of tiles that can be 
stored. It is possible to specify an explicit number of bands with 
the BAND_COUNT opening option."


The problem could be when QGIS Reads the file, not when it writes 
the file.  I explains why we see 4 bands but not why values are 
changing.  I would make a bug report or ask the question on the gdal 
dev group to get Even Rouault's attention.


Nicolas


On 2020-12-01 12:17 p.m., Sebastian Gutwein wrote:
This looks like the same issue you are having. 
github.com/qgis/QGIS/issues/38227 
<http://github.com/qgis/QGIS/issues/38227>
According to the documentation linked in the issue you need to set 
the band count to 1 otherwise it defaults to 4.
gdal.org/drivers/raster/gpkg.html 
<http://gdal.org/drivers/raster/gpkg.html>

I have not tried this to see if it works.

On Tue, Dec 1, 2020 at 11:52 AM Nicolas Cadieux 
mailto:njacadieux.git...@gmail.com>> 
wrote:


Hi,

Looking at it now.  I see what you see.  I will try a few things.

Nicolas

On 2020-12-01 11:42 a.m., Alberto Vavassori wrote:


Hi Nicolas,

thank you for the answer. I send the raster that I am
interested in.

Alberto

*Da:*Nicolas Cadieux 
<mailto:njacadieux.git...@gmail.com>
*Inviato:* martedì 1 dicembre 2020 17:40
*A:* Alberto Vavassori 
<mailto:alberto.vavass...@polimi.it>
*Cc:* qgis-user@lists.osgeo.org <mailto:qgis-user@lists.osgeo.org>
*Oggetto:* Re: [Qgis-user] Importing a raster into a Geopackage

Hi,

Send a sample data set if you can't figure it out.

Nicolas

On 2020-12-01 10:35 a.m., Nicolas Cadieux wrote:

Hi,

Perhaps this can help:
https://gdal.orgdrivers/raster/gpkg.html
<https://gdal.orgdrivers/raster/gpkg.html>

“Various kind of input datasets can be converted to
GeoPackage raster :

·Single band grey level

·Single band with R,G,B or R,G,B,A color table

·Two bands: first band with grey level, second band with
alpha channel

·Three bands: Red, Green, Blue

·Four band: Red, Green, Blue, Alpha

GeoPackage rasters only support Byte data type.”

My guess is that if the original raster does not
correspond to one of the categories above, it will be
converted to the closest format.

Nicolas Cadieux

https://gitlab.com/njacadieux <https://gitlab.com/njacadieux>



Le 1 déc. 2020 à 09:58, Alberto Vavassori

<mailto:alberto.vavass...@polimi.it> a écrit :



Hello everybody. I have an issue regarding the
Geopackage format. I have tried to import a singleband
raster file (it represents the land cover, thus every
pixel has a single integer value corresponding to the
land cover class), but this operation seems to modify
the raster characteristics: the raster becomes a
4-bands raster and the pixels values change
accordingly (basically, the original raster is saved
in the Geopackage as an RGB image). It seems to be a
bug of QGIS. I have also tried to use GDAL translate
through the processing toolbox of QGIS to convert the
TIFF file to a Geopackage file, but the result is the
same.

Has anybody faced this problem? May anybody suggest a
way to work this problem out?

Thank you.

Alberto

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Re: [Qgis-user] R: Importing a raster into a Geopackage

[Kirk Schmidt]

/njacadieux  <https://gitlab.com/njacadieux>

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Re: [Qgis-user] Importing a raster into a Geopackage

[Kirk Schmidt]

Hello Alberto:

I just tried saving a dem (single band raster) as a geopackage using 
QGIS 3.10.1.  The only issue I can think of is if you select rendered vs 
raw data in the export dialog (see top of screen shot below).


Can you share the version you are using?

Kirk

On 12/1/2020 10:56 AM, Alberto Vavassori wrote:


Hello everybody. I have an issue regarding the Geopackage format. I 
have tried to import a singleband raster file (it represents the land 
cover, thus every pixel has a single integer value corresponding to 
the land cover class), but this operation seems to modify the raster 
characteristics: the raster becomes a 4-bands raster and the pixels 
values change accordingly (basically, the original raster is saved in 
the Geopackage as an RGB image). It seems to be a bug of QGIS. I have 
also tried to use GDAL translate through the processing toolbox of 
QGIS to convert the TIFF file to a Geopackage file, but the result is 
the same.


Has anybody faced this problem? May anybody suggest a way to work this 
problem out?


Thank you.

Alberto


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Re: [Qgis-user] Does QGIS3 freezes more often than QGIS2 ?

[Kirk Schmidt]

Hi Idan:

I usually go through the "add raster Layer" button and it seems to work 
seamlessly with small and large rasters in 3.10.1 working on windows 
8.1x 64.  I wonder if it is an issue with the drag and drop function and 
or related to raster files size?


Kirk

On 11/26/2020 1:18 PM, Idan Miara wrote:

Hi,

I was wondering if I'm the only one who experiences sudden freezes in 
QGIS3 (on Win10x64)
It's hard to pinpoint exactly what triggers these freezes but usually 
it happens more often when I drag and drop raster files from the file 
explorer onto the QGIS canvas.
Usually after a few seconds it unfreezes and I can continue my work, 
otherwise I just force close and reopen QGIS.


This almost never happens to me with QGIS 2.17 and keeps happening on 
every QGIS3 version I tested (including the latest).


Is there any easy way to debug this?

Idan

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Re: [Qgis-user] map link request

[Kirk Schmidt]

Students that verbally or physically abuse their fellow students 
(mobbing auf Deutsch).


Kirk

On 11/9/2020 10:01 AM, Bernd Vogelgesang wrote:

what is school bulling?

On 09.11.20 13:58, labri...@eled.auth.gr wrote:

Hi all,

Does anyone know if there is any world map of school bulling?
If yes, can you please send me the link?

thank you
Nikos



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Re: [Qgis-user] Checking SRTM resolution .

[Kirk Schmidt]

Hi Jean:

Load the raster into QGIS and left click on the name in the Layers 
View.  Click on properties item and then information tab . Scroll down 
to the "Dimensions / Origin/Pixel size" Labels. The fisrt integer next 
the pixel size will be the resolution in meters if you are using a 
projected coordinate system.


You can always double check by zooming into a few pixels and use the 
measure tool to measure the pixel extent.


Kirk

On 8/16/2020 7:49 AM, jean Lukusa wrote:

I have downloaded SRTM from QGIS 3.14.1.
How Can I Check its  resolution?

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Re: [Qgis-user] wishing for accurate lattitude/longitude from a cell phone

[Kirk Schmidt]

Hi List:

In my experience, the key is writing output in rinex format so that the 
rover data can be corrected either using PPP if you can collect your GPS 
data over and extended period of time or use pre-existing (or self 
deployed) base station over a know coordinate to provide correction 
data.  Most consumer grade units output the final position solution, not 
detailed satellite data which is required for followup processing.


Kirk Schmidt

On 5/25/2020 2:31 PM, chris hermansen wrote:

Martin and list,

To me, in general, I think I would try to go with a Raspberry Pi based 
solution.  The hardware isn't all that expensive and the easy ability 
to do stuff directly with the output of the device in Python or some 
other programming language seems to be preferable to messing around 
with Android or iOS applications.


One of many articles that may be of interest 
https://learn.adafruit.com/adafruit-ultimate-gps-on-the-raspberry-pi?view=all


On Mon, May 25, 2020 at 9:25 AM Martin Weis 
mailto:martin.weis.newsadr...@gmx.de>> 
wrote:


Dear list,

I would like to add some things here, since I am trying to use RTK GPS
in the field with mobile devices.

> 1) Accuracy of GPS Devices

RTK GPS or any more precice GPS technology will be external, you
cannot
get around the missing measurements and lack of algorithms in consumer
grade chips.

Then it depends on the capabilities of the device to receive
satellites
of all systems (one or multiple frequencies/signals) and be able to
apply correction data (a question of algorithms). For better equipment
the prices rise quickly.

There are some low cost devices evolving, a new chip was recently
announced: Skytraq PX1122R for about $100. Could be tested with a
break
out board and antenna, e.g. see board at navspark shop. The module
even
supports PPP, which might be especially interesting where mobile
network
is not available.

https://navspark.mybigcommerce.com/px1122r-evb-px1122r-multi-band-quad-gnss-rtk-evaluation-board/

Other low cost solution were mentioned (emlid/REACH, Catalyst, etc).


Am 23.05.20 um 21:51 schrieb Michael.Dodd:
> One app that claims to do a lot of what high precions gps does
is> Mobile Topographer Free – Apps on Google Play

> 2) Software

On Android I was able to get the external signal into the system, you
need the app "Bluetoth GPS" (or similar) or a USB2serial + app (better
avoid tiny plugs and large cables during field work). Additionally you
need to override the internal GPS position with the Blue GPS App
in the
developer settings (mock provider).

My impression was, that most Android applications target the
accuracy of
the device only, so e.g.

* you cannot zoom to cm-levels, only ~100m
* not many proper GIS Apps are available, most are expensive
* Tracking usually does not rely on cm-grade positions, so the
apps are
not made for it

One particular thing is, that with high accuracy of the signal, an
internal computation in single precision float will not suffice (all
computations must be in double precision), and you may end up with
a cut
off of the last position digits, e.g. if you have 8 digits, 4
before and
4 after the decimal separator (e.g. in DDMM. format), then you end
up with coordinates cut down to 2-3 decimeters in the real world
(typical GPS mouse output, not so uncommon).

So, looking into that aspect may be required, and only few Apps may
implement that (e.g. expensive "surveyor" apps for professionals? did
not test).
BTW, sponsoring the double accuracy implementation for QField is
welcome, as mentioned ot the webpage. It is already a very usable and
FLOSS GIS solution for the field, especially useful if you have a QGIS
workflow already ;)

Finding proper solutions and recommendations still required...



>

> *From:* Qgis-user mailto:qgis-user-boun...@lists.osgeo.org>> on behalf of
> j.hu...@post-ist-da.de <mailto:j.hu...@post-ist-da.de>
mailto:j.hu...@post-ist-da.de>>
> *Sent:* 23 May 2020 20:35
> *To:* qgis-user@lists.osgeo.org
<mailto:qgis-user@lists.osgeo.org> mailto:qgis-user@lists.osgeo.org>>
> *Subject:* Re: [Qgis-user] wishing for accurate
lattitude/longitude from
> a cell phone
>
>
> Hi Steve,
>
> I think there are two different aspects to your question:
> 1) Accuracy of GPS Devices
> I agree with others that you can't expect a better accuracy than
the 10
> to 30 feet you observed with a smartphone or a simple handheld
GPS. This
> might improve by averaging, but this takes time. Survey grade GPS
> device

Re: [Qgis-user] Viewshed From Specific Elevation?

[Kirk Schmidt]

Chris:

Super. In retrospect, the negative observer height should come back with 
a null result as you cannot see much if you are standing in a well.


You could run a buffer of 2 m around every observation point and 
recalculate your raster DSM values to a set elevation (ie 10m) and 
calculate your observation elevation by  subtracting 10 m from your 
actual observation elevation.  That way, your observation height will be 
modeled correctly.


Have fun

Kirk Schmidt


On 5/14/2020 6:48 PM, cg...@graytechsoftware.com wrote:


I’ve done what you described – select a point away from the edge and 
manually adjust the observer height. This does work.


I also tested negative observer height. If it is surrounded, the 
viewshed simply shows nothing (neighboring pixels only).


However, I’m going to be doing 100+ points over multiple locations. 
Ideally, when I setup a viewshed point (including elevation), I can 
just run an analysis from that location and ignore the first 2m or so. 
I think manipulating every point will be cumbersome.


Thank you, Chris

*From:* kirk 
*Sent:* Thursday, May 14, 2020 5:36 PM
*To:* cg...@graytechsoftware.com; qgis-user@lists.osgeo.org
*Subject:* Re: [Qgis-user] Viewshed >From Specific Elevation?

You could try converting the first lidar returns to a raster layer and 
using a negative elevation observer value or select point that is one 
or 3 pixels away from the edge of the roof.  I am not sure if the 
negative observer height will work but it may.  If you need to remove 
obstructions, you can create a mask and recalculate the elevations if 
the obsructions below the observer height and rerun the viewshed.


Sent from my Samsung Galaxy smartphone.

 Original message 

From: cg...@graytechsoftware.com <mailto:cg...@graytechsoftware.com>

Date: 2020-05-14 5:42 PM (GMT-04:00)

To: qgis-user@lists.osgeo.org <mailto:qgis-user@lists.osgeo.org>

Subject: [Qgis-user] Viewshed From Specific Elevation?

I am attempting to test viewsheds from multiple heights below the 
roofline of particular buildings. I have been identifying viewing 
positions from directly from LiDAR data, but I cannot find a way to 
use absolute values for elevation.  The build-in visibility analysis 
seems to always use the raster elevation value plus the relative 
observer height.


I would like to use an absolute Z value, and have some immediate zone 
that is ignored (i.e., ignore the first 2m of obstructions) so that a 
viewpoint that might be lower than the raster elevation value can get 
outside of a building.


Is there a plugin or alternative visibility analysis tool that can do 
this? I was able to get it to work in Manifold Viewer, but I would 
like to keep the workflow within QGIS if possible.


Thank you, Chris


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Re: [Qgis-user] QGIS: DTM from numerous xyz files

[Kirk Schmidt]

Hi Bjorn

I usually combine the xyz files using a windows batch file that appends 
all the files in a directory. Then import into SAGA and write as a 
geotiff.  If you contact me directly, I am sure I can lay my hands on a 
routine that does the append


Kirk

On 4/29/2020 10:42 AM, Rauchfuss, Björn wrote:

Hi folks, this is my first question via the QGIS user mailing list. I am no 
longer a complete beginner with QGIS but I am certainly not a professional.

Now I have to combine almost 4000 (!) xyz files with a total of about 3 GB to a 
DTM. Unfortunately I have not yet found an elegant solution for this without 
adding each file individually. I'm thinking of a kind of batch processing (add 
raster layer, set projection, etc.). Does anyone have an idea or a helpful link 
at one's fingertips?

Best wishes
Bjoern
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Re: [Qgis-user] (no subject) (LIDAR vs SRTM accuracy comparisons)

[Kirk Schmidt]

You sure can, you can create a difference grid using the Saga tools.  
You also can use profile tools for liner features to compare route 
elevations.  One would expect the Lidar to win if it was processed with 
kinematic GPS.


On 3/24/2020 12:05 PM, qgis-u...@stripfamily.net wrote:

On 3/24/2020 6:20 AM, Noor Ainekar wrote:


I am currently doing my dissertation for University. And wanted to 
know if i can use QGIS to compare LiDAR data and SRTM data for a 
specific location for an accuracy assessment.


QGIS has a range of tools for comparing two rasters. Once you have 
converted your LIDAR data to a raster file, you will be able to 
compare the LIDAR and SRTM values.


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Re: [Qgis-user] how show themes from single polygon having rainfall time series data

[Kirk Schmidt]

Hi Shrawan:

I am not sure if you want to show a time series graph on the polygon or 
were you thinking something else.  Perhaps monthly totals over 12 maps?


Please provide more detail and I am sure the community can help you out?

Kirk Schmidt

On 3/22/2020 4:12 PM, shrawan tripathi wrote:

Hi,
I want to show rainfall distribution for a time series for a single 
polygon, is it possible?

if yes please let me suggest.

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Re: [Qgis-user] Transformations & Projections

[Kirk Schmidt]

Hello Glarivie:

I just did a quick test to convert from NAD83 to Conus albers. When yous 
elect your CRS for the exported data, the converston parameters are 
shown at the bottom of the CRS selector window.  In my case :


Extent: -124.79, 24.41, -66.91, 49.38

Proj4: +proj=aea +lat_1=29.5 +lat_2=45.5 +lat_0=23 +lon_0=-96 +x_0=0 
+y_0=0 +ellps=GRS80 +units=m +no_defs



This shows you the bounds of the new CRS as well as the default 
ellipsoid for Conus Albers.  I  this case there is no scaling (k=0) and 
no false eastings or northings applied.



I hope this helps.


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RR # 1
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B0K 1W0
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Email: k...@nortekresources.com
Web: www.nortekresources.com



On 2/26/2020 7:59 AM, glarivie . wrote:

Hello,

I'm pretty new to QGis, so I'm sure this is basic but I was hoping 
someone could walk me through this using version 3.4. I have csv data 
that's in both WGS84 and NAD83. The desired end-projection is EPSG: 
6350 NAD83(2011) Conus Albers. I've loaded each into a blank QGis 
project (separately) and saved as shapefiles in the target CRS. I then 
need to perform some interpolations using the data.


My question is, have I missed a step? Do I need to perform a separate 
step to transform the datum (particularly the WGS84 data). Since 3.4 
uses PROJ 5.2, I was assuming that the step where I "save as" in the 
target CRS takes care of both the datum transformation and the 
projection. Is this assumption correct? If so, what default 
transformation is taking place and is there a way for me to determine 
what it is?


Thanks so much for your help! I'm, unfortunately, a little stumped here.

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Re: [Qgis-user] HELP - Saving a new Shape file layer.

[Kirk Schmidt]

Hi Edward:


Right click on the layer in the legend window and select export > save 
features as.



Kirk

On 1/21/2020 10:59 AM, Edward Molteno wrote:
Have just upgraded to version 3.10.1 from 2.18 and 2.16 after a long 
layoff from using QGIS and need to do some urgent work on QGIS.


Not sure what I am missing but can not save a new Shape file layer as 
R clicking does not bring up menu to save and no button on form either.


Please help.

Edward



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Re: [Qgis-user] Micro-Geometry Problems

[Kirk Schmidt]

Hi All:

 

This is a classic digitizing issue that can be corrected with GRAS  as Harrisou 
suggests.  If the layer does not get cleaned during the import process, you can 
use the grass functions v.build and v.clean to fix the digitizing slivers and 
incomplete intersections.

 

Kirk Schmidt

 

 

 

From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of DelazJ
Sent: Wednesday, January 15, 2020 3:45 AM
To: dhdeange...@comhem.se
Cc: qgis-user
Subject: Re: [Qgis-user] Micro-Geometry Problems

 

Hi,

There's also a "snap geometries to layer" Processing algorithm in QGIS that 
could be worth a look.

https://docs.qgis.org/3.4/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#snap-geometries-to-layer

 

Regards,

Harrissou

 

Le mer. 15 janv. 2020 à 08:34, Hernán De Angelis  a 
écrit :

Steve,

In my opinion this is where GRASS topological vector model shines. One 
suggestion would be to import these vectors into a GRASS location and let GRASS 
clean the polygons and fix the topology automatically during import. My 
experience with similar problems is that after the import and cleaning there 
would be few if any errors of the sort you mention. In the worst case any 
surviving error is found it could in principle be solved by deleting the 
stubborn surface and digitizing it again. It will definitely not take two weeks 
of work!

Good luck!

H.

 

On 2020-01-14 22:51, smiller...@cfl.rr.com wrote:

All-

 

I have digitized a land use/land cover layer as individual polygons.  The snap 
options were used and, for most vertices, the snap was precise.  A vertex in 
polygon A has a precise match to a vertex in neighboring polygon B.

 

But in 582 out of 2799 polygons, there are mis-matches in adjoining vertices 
that are only evident if you zoom into the layer at a magnification (i.e., a 
scale) of from 2:1 to 4 to 1.  I have spent a couple of weeks trying to 
remedy these by hand using the Vertex Tool and other means.  My question is 
this: is there an automated way in QIS to detect and remedy these situations?

 

Thanks,

Steve Miler

 

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Re: [Qgis-user] multiple polygon features within a layer

[Kirk Schmidt]

Hi Dave:

You can create a new layer and then digitize the polygons you require.  
Give each polygon a unique attribute and then set up the symbology as 
categorized by the attribute you coded.  Select a colour pallet and apply.


You can add a unique attribute to each polygon immediately after you 
finish digitizing.  The default attribute id 'id' and you can just enter 
seqential numbers as you go.  Alternatively you can add a new attribute 
or recalculate the id field after you finish digitizing.


Kirk

On 12/18/2019 4:17 AM, Dave Gardiner wrote:

I'm sure this is very basic stuff but how do I create multiple polygon
features within a layer, each with its unique color?

regards
Dave





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Re: [Qgis-user] Plugin to perform repetetive update ?

[Kirk Schmidt]

Do you expect to modify and update vector data and/or attribute data only? 

 

From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Lars I. 
Nielsen, LIFA A/S
Sent: Thursday, June 20, 2019 10:50 AM
To: 'Régis Haubourg'
Cc: 'QGIS Users List (qgis-user@lists.osgeo.org)'
Subject: Re: [Qgis-user] Plugin to perform repetetive update ?

 

Hi Regis.

 

Yes, I know that anything can be built. But I’m looking for a kind of generic 
tool, that I can use for ad-hoc updates. The updates tasks will vary from time 
to time.

 

You mention scripts. Is that the Processing Modeler you’re thinking of ?

 

 

Med venlig hilsen

 

Lars I. Nielsen, LIFA A/S
GIS-konsulent, FME Certified Professional
Geoinformatik
 


T

6313 6800

@

l...@lifa.dk


D

6313 6849

W

www.lifa.dk


M

2492 4866

 

 

 

 



  
  Beskrivelse: 
C:\Users\lin\AppData\Roaming\Microsoft\signatures\21x21-Images-Get-L749-l8.png
Følg os på LinkedIn og læs de seneste nyheder fra LIFA A/S 
 

Fra: Régis Haubourg [mailto:regis.haubo...@gmail.com] 
Sendt: 20. juni 2019 14:43
Til: Lars I. Nielsen, LIFA A/S
Cc: QGIS Users List (qgis-user@lists.osgeo.org)
Emne: Re: [Qgis-user] Plugin to perform repetetive update ?

 

Hi many things are possible using plugins, scripts or even database side logic, 
but we need you to explain what you precisely need so that we can help. 

Regards

Régis

 

Le jeu. 20 juin 2019 à 14:41, Lars I. Nielsen, LIFA A/S  a écrit :

Hi list.

 

I’m looking for a tool (plugin or otherwise) that assist me in making 
repetitive updates to features in a QGIS layer a little less cumbersome.

 

Does such a tool exist ?

 

 

Med venlig hilsen

Lars I. Nielsen, LIFA A/S
GIS-konsulent, FME Certified Professional
Geoinformatik
Beskrivelse: Beskrivelse: 
C:\Users\lin\AppData\Roaming\Microsoft\signatures\284x82-Images-Get-L749-l3.gif


T

6313 6800

@ 

l...@lifa.dk


D

6313 6849

W

www.lifa.dk


M

2492 4866

CVR

20937289


  Beskrivelse: Beskrivelse: 
C:\Users\lin\AppData\Roaming\Microsoft\signatures\21x21-Images-Get-L749-l8.png
Følg os på LinkedIn og læs de seneste nyheder fra LIFA A/S 

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Re: [Qgis-user] Is location info included in metadata when save an image file?

[Kirk Schmidt]

Ert:

With a jpg or png file, the coordinate data are stored in the world file 
(a simple text file with the pixel x gsd , rotation,pixel y gsd, x 
coordinate, top left, y coordinate top left - see sample below).  For a 
pdf, the coordinate data is stored within the pdf and you would have to 
check the geo-pdf specs to see where they are stored.  If you write a 
geotiff, the coordinates will be contained withing the file header.


Sample tiff world file (*.tfw)

0.025000
0.00
0.00
-0.025000
674643.3881379978
4945024.4282323727

Kirk

On 6/4/2019 1:48 PM, Alex M wrote:

Nyall,

I just did a test like Kirk png and jpg do not contain EXIF coordinates.
For the purposes of this discussion the original poster wants to know
which formats drop the location data, and it appears jpg and png are
safe for that purpose. I would advise that not every format will behave
the same, as we all seem to agree a tiff from the Image Save should have
the location in it's metadata. Though I know a good way to strip that
out - GIMP or Photoshop, open & export usually kills all metadata,
command line Photography tools might also (e.g. imagemagick).

Tested with QGIS 3.4

Thanks,
Alex

On 6/3/19 16:16, Nyall Dawson wrote:

On Tue, 4 Jun 2019 at 09:13, Fernando M. Roxo da Motta  wrote:

On Mon, 3 Jun 2019 11:01:06 -0300, Kirk Schmidt
 wrote:



Hi Ert:

You can save locational data in jpg and pdf files from within the
Print Composer window.  Under composition tab on the right hand side
of the window, scroll down and check the Save World File checkbox.
Export your map/composition as a jpg or pdf and the geolocation data
will be written to a world file for a jpg and internally for a pdf.

   Just to be sure that I understood it correctly.   If I save as jpg
the geolocation information will be only written to the world file if I
check the Save World File checkbox.   That means that, regardless to
check or not that checkbox, the jpg image will not contain any
geolocation information.

   Is that correct?

Incorrect. It will always be embedded directly inside the image
metadata where possible. The "create world file" checkbox only
controls whether an external text file with the referencing
information is also created.

Nyall




Good luck

Kirk Schmidt

On 6/2/2019 4:26 AM, Ert Four wrote:

Thank you Alex and Roxo for your replies.

  From what I can tell the SVG and JPG files probably don't have
location info in them, but it's also hard to tell what exactly the
data is in some places, especially in the SVG.

It looks like qgsmaprenderertask.cpp was written two years ago,
which was after 2.14 came out.

I will post on the developer list per Alex's suggestion. All of
this is trying to prove that something doesn't exist -- which is
always hard.

Thanks again.



On June 1, 2019 at 4:41 PM "Fernando M. Roxo da Motta"
 wrote:


On Thu, 30 May 2019 17:09:59 +0200 (CEST), Ert Four
<4...@mailbox.org> wrote:



Does any coordinate or location data get embedded in the image
file if I use Project > Save as Image or Composer > Export as
Image/PDF/SVG?

I'm using QGIS version 2.14.3 Essen, although I would like to know
about more recent versions, too, for when I upgrade later.

(I'm aware of the option to check "World file on" and create a
separate world file. What I need is to make sure there is no
identifying info whatsoever from the project file in the image
file itself.)

Eg, say I have a basemap like OpenStreetMap open for a country
and I load points in another layer that are inside that country.
Then I zoom in on a group of points from my data layer, I turn
off the basemap layer, and make a map with just my data points. I
want to preserve the relative spatial relationships between my
points but not reveal where in the world the map came from. If I
publish this image file, might the metadata reveal the location?

For the work we do, it's critically important we not unknowingly
publish specific locations.


AFAIK, if you save in PNG or JPEG format no coordinate
information is stored in metadata of the image:

$ exiftool Inhambu.jpg
ExifTool Version Number : 10.80
File Name   : Inhambu.jpg
Directory   : .
File Size   : 49 kB
File Modification Date/Time : 2019:06:01 11:37:04-03:00
File Access Date/Time   : 2019:06:01 11:37:04-03:00
File Inode Change Date/Time : 2019:06:01 11:37:24-03:00
File Permissions: rw-r--r--
File Type   : JPEG
File Type Extension : jpg
MIME Type   : image/jpeg
JFIF Version: 1.01
Resolution Unit : inches
X Resolution: 96
Y Resolution: 96
Image Width : 917
Image Height: 665
Encoding Process: Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Comp

Re: [Qgis-user] Is location info included in metadata when save an image file?

[Kirk Schmidt]

Hi Ert:

You can save locational data in jpg and pdf files from within the Print 
Composer window.  Under composition tab on the right hand side of the 
window, scroll down and check the Save World File checkbox.  Export your 
map/composition as a jpg or pdf and the geolocation data will be written 
to a world file for a jpg and internally for a pdf.


Good luck

Kirk Schmidt

On 6/2/2019 4:26 AM, Ert Four wrote:

Thank you Alex and Roxo for your replies.

 From what I can tell the SVG and JPG files probably don't have location info 
in them, but it's also hard to tell what exactly the data is in some places, 
especially in the SVG.

It looks like qgsmaprenderertask.cpp was written two years ago, which was after 
2.14 came out.

I will post on the developer list per Alex's suggestion. All of this is trying 
to prove that something doesn't exist -- which is always hard.

Thanks again.



On June 1, 2019 at 4:41 PM "Fernando M. Roxo da Motta"  wrote:


On Thu, 30 May 2019 17:09:59 +0200 (CEST), Ert Four <4...@mailbox.org>
wrote:



Does any coordinate or location data get embedded in the image file
if I use Project > Save as Image or Composer > Export as
Image/PDF/SVG?

I'm using QGIS version 2.14.3 Essen, although I would like to know
about more recent versions, too, for when I upgrade later.

(I'm aware of the option to check "World file on" and create a
separate world file. What I need is to make sure there is no
identifying info whatsoever from the project file in the image file
itself.)

Eg, say I have a basemap like OpenStreetMap open for a country and I
load points in another layer that are inside that country. Then I
zoom in on a group of points from my data layer, I turn off the
basemap layer, and make a map with just my data points. I want to
preserve the relative spatial relationships between my points but not
reveal where in the world the map came from. If I publish this image
file, might the metadata reveal the location?

For the work we do, it's critically important we not unknowingly
publish specific locations.


   AFAIK, if you save in PNG or JPEG format no coordinate information is
stored in metadata of the image:

$ exiftool Inhambu.jpg
ExifTool Version Number : 10.80
File Name   : Inhambu.jpg
Directory   : .
File Size   : 49 kB
File Modification Date/Time : 2019:06:01 11:37:04-03:00
File Access Date/Time   : 2019:06:01 11:37:04-03:00
File Inode Change Date/Time : 2019:06:01 11:37:24-03:00
File Permissions: rw-r--r--
File Type   : JPEG
File Type Extension : jpg
MIME Type   : image/jpeg
JFIF Version: 1.01
Resolution Unit : inches
X Resolution: 96
Y Resolution: 96
Image Width : 917
Image Height: 665
Encoding Process: Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components: 3
Y Cb Cr Sub Sampling: YCbCr4:2:0 (2 2)
Image Size  : 917x665
Megapixels  : 0.610

$ exiftool Inhambu.png
ExifTool Version Number : 10.80
File Name   : Inhambu.png
Directory   : .
File Size   : 47 kB
File Modification Date/Time : 2019:06:01 11:37:04-03:00
File Access Date/Time   : 2019:06:01 11:37:04-03:00
File Inode Change Date/Time : 2019:06:01 11:37:44-03:00
File Permissions: rw-r--r--
File Type   : PNG
File Type Extension : png
MIME Type   : image/png
Image Width : 954
Image Height: 652
Bit Depth   : 8
Color Type  : RGB with Alpha
Compression : Deflate/Inflate
Filter  : Adaptive
Interlace   : Noninterlaced
Significant Bits: 8 8 8 8
Pixels Per Unit X   : 3780
Pixels Per Unit Y   : 3780
Pixel Units : meters
Image Size  : 954x652
Megapixels  : 0.622

   If you save as geotiff the positioning information should be written
in metadata.  I don't know about the PDF format.  In any case, all
informations, except the CRS, will be written to the world file.

   HTH



Thank you, first time posting, very much appreciate QGIS and its
community!








   Roxo

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Except where explicitly stated I speak on my own behalf.|  VI !!
 PU5RXO  | I see text,
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Re: [Qgis-user] (no subject)

[Kirk Schmidt]

Hi Tulika:

You will need a minimum of 3 GCP's for the algorithm to work. With out 
more detail, it is difficult to determine what the issue is.  Please 
provide more detail and I am sure we can find a solution for you.


Kirk


On 4/28/2019 2:35 PM, Tulika Biswas wrote:
I have an issue with using the georeferencer.My problem is after 
adding co ordinates to the map and giving the transformation 
settings.. I am running the georeferencing option.. Then it is being 
displayed on the screen as
"Failed to compute GCP points." and the map is also not being shown in 
the qgis interface..

Plz  help.. Its very urgent..

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Re: [Qgis-user] QGIS, gdal_contour and numerical label formatting...

[Kirk Schmidt]

Hi Richard:

A simple work around is to multiply the raster by 1 or so, generate 
the contours and then recalculate the actual value in the attribute 
table to the precision you require.


Kirk Schmidt

On 4/25/2019 11:31 AM, Richard Duivenvoorde wrote:

Hi List,

I have a (smoke dispersion) raster model output of which I want to have
contour lines.
One special/strange condition: contours should be on 0.0001 (1.0E-4)...
(apparently gdal)

QGIS/gdal_contour to the rescue:

http://duif.net/temp/labelnumbers.png

But as I demo'ed this to somebody, some things came up:

- if you use gdal_contour in processing in QGIS  with a temporary layer,
then you create a SHAPE file with (default) column type 10/3 so all
values are show as 0.000 
BUT, if you let processing save to geopackage (as in screendump), you do
NOT have this limit.

Question: would it be feasible to move to geopackage as intermediate
format in processing (at least for gdal_contour)? Is this easy to do?

- if you open the attribute table of the contours, there is an ELEV
column with type 'real' but the values you see in the labels in the
image are the same as you see in the attribute table
While if you open the geopackage in slqitebrowser, you see values like
ordered: 0.0001, 0.0002,  etc without the trailing 10 numbers..
Going to geojson, it looks good too (and saving that one to gpkg... is
ok too)?

- the (number) labels look awfull?

Question: how determines QGIS how to show floats/reals in the attribute
table? Is that something we could influence? Or is that 'not done', and
should I create a text column from the real column?

Question2: for what I can see you can influence the format of TEXT in
the label tools, but you cannot influence the format of NUMBERS, am I right?

Would be a nice feature I think? (or is this overkill, and should I go
the number->text way)?

Thanks for any input or pointers.

Wanne play? http://duif.net/temp/smoke.zip is an example epsg:4326
raster smoke plume.

Regards,

Richard Duivenvoorde
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Re: [Qgis-user] Road Network Extraction out of Raster Images

[Kirk Schmidt]

Hallo Elvin:

This would be a bit tricky as roads are not created equal.  A paved road 
and associate paint is very different from a cobblestone or gravel 
road.  Add shadows from trees, buildings and rock cuts and the 
complexity increases.   If you used a supervised classification you 
would end up with clusters of pixel polygons or pixel points that would 
not be very consistent.  The level of work required to edit and simplify 
these  would be very time consuming.  It is for these reasons that 
original line features such as roads where digitized as simple vectors.  
As bernd suggest below, existing vector data is available for most areas 
and it is simply a matter of locating and accessing these sources.


Kirk

On 4/18/2019 12:10 PM, Bernd Vogelgesang wrote:


Hi Elvin,

I do not know of any trick how to extract a road network from images 
besides a trained image classification model. But may the question be 
allowed why you can't just use the OpenStreetMap data directly?


Cheers,
Bernd

Am 18.04.19 um 15:12 schrieb Elvin Roldan:


Hello:

I’m writing because I’ve been a long time user QGIS and really 
appreciate all the work that has been put to it and all the 
initiatives to continue to evolve and maintain it as an important 
open source GIS system.


My question is aim does anybody know how to extract a road network 
using spatial analysis tools within QGIS. I want to extract all roads 
from aerial images to convert to vectors (polylines or polygons) to 
do various analysis involving the existing road network.


If anybody can point me in the right direction  I would appreciated.

Thanks.

Elvin Roldán


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Re: [Qgis-user] Qgis 3.6 network analysis

[Kirk Schmidt]

Hi jean:

Open the composer and right click on the default page.  Select page 
properties from the dropdown and you can set up your paper and 
orientation parameters.


On 4/16/2019 8:06 AM, jean Lukusa wrote:

Hi  All !
Would  like  to  know  how  I can set up my map in portrait   shape.  
I tried  all tools  but can't  with Qgis3. 6


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Re: [Qgis-user] Creating DEM from Contour lines

[Kirk Schmidt]

Hi Ulli:

 

I would try converting the contour lines to points first, then generating a 
DEM.  We use this workflow from time to time when we do not have a high quality 
DEM to work with.  

 

Kirk

 

From: Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] On Behalf Of Ulrich 
Kriechbaum
Sent: Thursday, November 08, 2018 7:10 AM
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Creating DEM from Contour lines

 

Hello all!

 

I investigate a Glacial Lake Outburst Flood which eroded a lot of material. 
What i try to do is to backcalculate the event with the simulation tool 
r.avaflow. For my simulations i need a Pre-Event DEM. I have a Post-Event DEM 
where the eroded trench is clearly visible. So what i did was to project the 
Contour lines of the Post-DEM, change them so that the trench is "flattened". 
Now i try to generate a Pre-Event DEM with these Contour lines. That's the 
point at which i am struugling. I tried to interpolate the Contour lines (TIN 
and IDW) but the results were not really satisfying.

 

Does anyone have an idea how to get a nice DEM from contour lines?

 

Best regards,

 

Ulli

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Re: [Qgis-user] Georeferencing for Avenza

[Kirk Schmidt]

Hi Peter:

Generate the map you require in the field using the print composer.  In 
the items window on the right hand side of the standard composer window, 
select the Composition Tab and check the save world file option in the 
export settings.


Save the pdf of the map and load into Avenza.


Kirk


On 10/30/2018 7:39 AM, Gmail - Peter wrote:


Dear List Subscribers

Are there any updates to the threads of 2015/2016 regarding QGIS 
producing georeferenced tifs or pdfs for loading into Avenza?  I am a 
newbie to QGIS (Madeira 3.4) and while I have succeeded in producing a 
correctly georeferenced tif file via Raster>Conversion>translate, this 
only works on one layer.  The three other methods I can see to export 
or print a pdf or tif do not produce a correctly georeferenced file in 
Lats/Longs using GDA94Z50.  The file according to Avenza is ~54deg and 
89deg south and west of where it should be.


I am starting with a non-georeferenced raster which I put through the 
georeferencer with 6 GCPs and several experiments of transformation 
types, settling on polynomial 1.  The process produces a tif, pdf, and 
loads back into the main window.  The main window raster is 
georeferenced perfectly, so wouldn’t you think the other output would 
be too?


The correct method should be to use Print Layout, produce a map with 
all the layers from the main window, and export as an image or pdf.  
This might work if the map units were real world and not mm.


The fall back should be Project>Import/Export>Export Map to Image or 
pdf from the main window, but that doesn’t work either.


I hope the solution is obvious and I have overlooked something 
simple.  Any guidance appreciated, I like to take my maps out into the 
field.


Regards

Peter



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Re: [Qgis-user] Process images to generate the median

[Kirk Schmidt]

Hi Eddison

Use the processing toolbox, SAGA>Raster Calculus>Raster Calculator.  
Select the raster (grid) layers you require and use the formula 
(a+b+c+d+e/5).  This assumes the values for each grid is a single band.


Kirk

On 10/17/2018 4:21 PM, Eddison Araya wrote:

Hello!! a question:

If I have 5 satellite  (Image 1, 2, 3, 4 and image 5) images of the 
same area but from different times and I want to make an image 6 that 
represents the median, how can I do that with the QGIS tools?


Thank you

Eddison


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Re: [Qgis-user] WFS failure

[Kirk Schmidt]

I just tried it with 2.18.6 and get the same error.

Layer OGC_Gasnetbeheerdervlak: Download of features for layer 
se:OGC_Gasnetbeheerdervlak failed or partially failed: Server generated 
an exception in GetFeature response: Internal error. You may attempt 
reloading the layer with F5


Kirk Schmidt

On 6/15/2018 11:12 AM, Jeroen Hovens wrote:

Hi all,

Using Qgis 2.18.20 (64bit, windows) I can't download/open a specific wfs layer.
Using 2.14.18 (64bit, windows) the same WFS link works without a problem.

What is going wrong in 2.18.20?
The error is the following (in Dutch)
Laag se:OGC_Gasnetbeheerdervlak: Downloaden van objecten voor laag 
se:OGC_Gasnetbeheerdervlak mislukt of gedeeltelijk mislukt: Server genereerde 
een uitzondering in het antwoord GetFeature: Internal error. U kunt met F5 
proberen om de laag opnieuw te laden

The wfs link is the following (all public data)
https://ogc.polygonentool.nl/wfs?
Username: MijnAansluitingOGC
Password: MApoly2017

Thanks in advance.

Jeroen

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Re: [Qgis-user] Coordinate Conversion

[Kirk Schmidt]

Hi Grant:

I would have a look at v.rectify which is a Grass routine that you can 
access through the processing toolbox>Vector>v.rectify.



Kirk Schmidt

New Glasgow, Nova Scotia, Canada


On 6/7/2018 1:36 AM, Grant Boxer wrote:


I have local grid coordinates (no projection) and I want to convert it 
into real world (GDA94 z 50) UTM coordinates. I have 4 points with 
both local and real world coordinates. I have looked at using 
v.transform but I need a way to calculate the parameters for the 
transform. Any suggestions where/how I can do this?


Grant Boxer

Perth, Western Australia



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Re: [Qgis-user] Problem georeferencing images in UTM

[Kirk Schmidt]

Hi Carlos:

I georeferenced 2 screen shots of your maps and obtained good results.  
I would have a close look at the coordinates of your ground control 
points and make sure you selected the utm grid intersection as a control 
point versus the corner of the mapsheet which is a lat/long grid. It is 
easy to make a simple mistake


Kirk



On 5/17/2018 8:53 PM, Carlos Henrique Grohmann de Carvalho wrote:

Thanks for the input Nicolas

These are official maps so the utm grid is ok. I figured that I was 
using a linear transformation, with the option to just create the 
world file, which works for control points at the corners (lat/long), 
since the boundaries of the map is defined by latitude/longitude. With 
UTM, this simple transformation won't work, but TPS will give the 
correct results.


Carlos


On Thu, May 17, 2018 at 7:28 PM, Nicolas Cadieux 
<nicolas.cadi...@archeotec.ca <mailto:nicolas.cadi...@archeotec.ca>> 
wrote:


Hi,
The utm grid is way off or we have the wrong epsg code.  If you
geofence using 2 points (linear algo)  using a service like google
earth, you will see the distortion.  The long lat coordinate are
probably ok but I did not test them.

You can either use the long lat or use more points. With 4 points
and using the thin plate spline, I got good results.
Nicolas

Le 17 mai 2018 à 12:42, Carlos Henrique Grohmann de Carvalho
<carlos.grohm...@gmail.com <mailto:carlos.grohm...@gmail.com>> a
écrit :


Thanks Nicolas, but the misalignment still persists. OTF is off,
project has same CRS as data (epsg 29192). There is a ~400m
difference in the N-S direction.

Carlos

On Thu, May 17, 2018 at 1:28 PM, Nicolas Cadieux
<nicolas.cadi...@archeotec.ca
<mailto:nicolas.cadi...@archeotec.ca>> wrote:

Hi,
Disable projection on the fly. Make sure the project is in
the same CRS as your maps.
Nicolas

Le 17 mai 2018 à 12:14, Carlos Henrique Grohmann de Carvalho
<carlos.grohm...@gmail.com
<mailto:carlos.grohm...@gmail.com>> a écrit :


Hello all

I have two pngs of topographic maps from southeastern Brazil
(a zip file with images and points is available here:
https://www.dropbox.com/s/mexeh4be46pgsk6/images_georef.zip?dl=0
<https://www.dropbox.com/s/mexeh4be46pgsk6/images_georef.zip?dl=0>)

I'm trying to georeference them, but with partial success
only. In this image
(https://www.dropbox.com/s/37xxqp4fkwpdyqh/utm_error.png?dl=0
<https://www.dropbox.com/s/37xxqp4fkwpdyqh/utm_error.png?dl=0>)
you can see that the X coordinate is fine, but the Y
coordinate of the two maps won't match.

Both maps use South American Datum 1969. I selected points
near the edges, and used the UTM values.

Interestingly, if I use Lat/Long, and place the points at
the corners, using decimal degrees, the maps align perfectly.


Any help is appreciated


-- 
Prof. Carlos Henrique Grohmann

Institute of Energy and Environment - Univ. of São Paulo,
Brazil
- Digital Terrain Analysis | GIS | Remote Sensing -

http://carlosgrohmann.com <http://carlosgrohmann.com/>
http://orcid.org/-0001-5073-5572
<http://orcid.org/-0001-5073-5572>

Can’t stop the signal.
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Institute of Energy and Environment - Univ. of São Paulo, Brazil
- Digital Terrain Analysis | GIS | Remote Sensing -

http://carlosgrohmann.com <http://carlosgrohmann.com/>
http://orcid.org/-0001-5073-5572
<http://orcid.org/-0001-5073-5572>

Can’t stop the signal.





--
Prof. Carlos Henrique Grohmann
Institute of Energy and Environment - Univ. of São Paulo, Brazil
- Digital Terrain Analysis | GIS | Remote Sensing -

http://carlosgrohmann.com <http://carlosgrohmann.com/>
http://orcid.org/-0001-5073-5572

Can’t stop the signal.


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Re: [Qgis-user] Problem with "non valid geometry"

[Kirk Schmidt]

Hi Boris:

You can use the grass modules under processing toolbox>Grass GIS 7 
commands>Vector>v.build.check or v.clean to isolate the problem. 
Typically it is a polygons with and intersecting sliver that creates the 
problem.


Kirk


On 5/9/2018 9:35 AM, boris diaz wrote:

Hi there, I´m trying to cut a raster with a polygon mask in qgis 2.18

The validation tool produces a draw with the message "valid output", 
but the topology tool finds a "non valid geometry" in the id objetc 0. 
The shape has only one object, an irregular polygon representing a 
watershed. SO the error shows the entire watershed.

Anyone can help me finding the real error and how can i repair it?
Thanks. Boris

--
Boris G. DIAZ - Mg.Sci.Ing. Forestal
Área Recursos Hídricos - INTA EEA Santa Cruz
Unidad Académica Río Gallegos (UNPA)
https://www.facebook.com/aguapatagonia/ 
<http://santacruzhidro.blogspot.com.ar/>

http://santacruzhidro.blogspot.com.ar/
www.researchgate.net <http://www.researchgate.net>
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Re: [Qgis-user] True North

[Kirk Schmidt]

The central meridian in each utm zone is oriented directly at true north 
(Easting of 500,000 m).  The difference in angles when you move east of 
west of the meridian is referred to as convergence and the following 
link provides 2 formulas for calculating the convergence angles in utm 
projections.  A quick search on convergence calculators or methods 
should also provide some tools.


https://gis.stackexchange.com/questions/115531/how-to-calculate-grid-convergence-true-north-to-grid-north

Kirk


On 4/3/2018 5:25 AM, Springfield Harrison wrote:


Alexandre,

I believe that true north is actually a constant oriented towards the 
North Pole, i e 90 degrees north latitude. Also where all meridians 
converge in the northern hemisphere.


The other North orientations are magnetic north and grid North and 
these do vary as you suggested.


I do need to use a UTM projection but need bearings to be in degrees 
true north.


Thanks Alexandre...

Cheers . . . . .   Spring
Samsung Tab 4

On Apr 2, 2018 4:27 PM, "Alexandre Neto" <senhor.n...@gmail.com 
<mailto:senhor.n...@gmail.com>> wrote:


AFAIK, true bearing differs in time and location because of
magnetic declination. So I don't think there is a such thing as a
CRS with true bearings.

Assuming you are working at regional level, find the magnetic
declination for that region and remove it from your observations.
Then draw the azimuth using the chosen CRS. I think 26910 will
work just fine.

If you are at a larger scale, then you may need to use different
magnetic declination values for each observation.

This may help:

https://www.ngdc.noaa.gov/geomag/declination.shtml
<https://www.ngdc.noaa.gov/geomag/declination.shtml>

Best Regards,

Alexandre Neto

A seg, 2/04/2018, 23:54, Springfield Harrison
<stellar...@gmail.com <mailto:stellar...@gmail.com>> escreveu:

Hello,

I am using CRS 26910, NAD83 / UTM zone 10N, and need to draw
lines at
exact true bearings.  The Advanced Digitizing Tool seems to do
this but
which CRS would I use to ensure that the bearing is True?

Thanks very much . . .


Cheers . . . . . Springfield Harrison


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Re: [Qgis-user] Looking for Spatial Query plugin on QGIS 3.1.0-Master

[Kirk Schmidt]

I like the new organization.  Makes it simple to access all loaded 
functionality in one pane.  Good work.


Kirk Schmidt


On 2/28/2018 10:42 AM, Colm O'Neill wrote:


Thank you Frank, I indeed found these functions in the processing 
section along with other options I didn't even know were possible.


Happy days!

Thanks all,

Best,

Colm.

On 28/02/2018 08:41, Frank Broniewski wrote:


Moin Colm,

you’re looking for buffer and such functions? They’ve moved to the 
processing toolbox (CTRL+ALT+T): select by location is there as well …


HTH

Frank

Dipl. Geogr. Frank Broniewski
Waldhölzbacher Str. 51
66679 Losheim am See
06872 509 068 4

0176 611 26 9 2 6
www.frankbroniewski.com

*Von:*Qgis-user [mailto:qgis-user-boun...@lists.osgeo.org] *Im 
Auftrag von *Colm O'Neill

*Gesendet:* Dienstag, 27. Februar 2018 19:00
*An:* qgis-user@lists.osgeo.org
*Betreff:* [Qgis-user] Looking for Spatial Query plugin on QGIS 
3.1.0-Master


Hello all,

New to qgis, really enjoying the learning curve. I'm looking for the 
functions that seem to be built in to the Spatial Query plugin, 
however I can't seem to find the plugin through the built in plugin 
manager or on plugins.qgis.org


To be clear, I'm looking for the plugin refereed to in this 
documentation 
https://docs.qgis.org/2.8/en/docs/user_manual/plugins/plugins_spatial_query.html 
or even at point 22 of 
http://www.qgistutorials.com/en/docs/performing_spatial_queries.html


Has it been renamed or integrated into the core?

Thanks!

All the best,

Colm O'Neill

--

Colm O'Neill | BE +32478479350 | NL +31685263286 | m...@colm.be 
<mailto:m...@colm.be>

colm.be | osp.kitchen


--

Colm O'Neill | BE +32478479350 | NL +31685263286 | m...@colm.be
colm.be | osp.kitchen



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Re: [Qgis-user] Exporting Maps

[Kirk Schmidt]

Tyler:

You can generate geopdf's directly in in print composer. Generate a map 
with a suitable size and scale to meet your needs.  Under the 
composition tab, scroll down and check the save world file in the export 
settings.  Then export a pdf and it will be georeferenced.



Kirk


On 2/21/2018 10:05 AM, Tyler Veinot wrote:

Richard;
No worries; you answered a question I haven't asked yet. I have been 
on and off looking for a way to make geopdf's.

Tyler

On Wed, Feb 21, 2018 at 8:48 AM, Richard McDonnell 
<richard.mcdonn...@opw.ie <mailto:richard.mcdonn...@opw.ie>> wrote:


Scratch that, I misunderstood your question.



On 21/02/2018 12:45, Richard McDonnell wrote:

Tyler,
Try GeorefExport Plugin for QGIS, it allows for a Geostatial PDF
see link below


https://gis.stackexchange.com/questions/146602/can-qgis-export-geospatial-pdf-for-avenza-pdf-map-app

<https://gis.stackexchange.com/questions/146602/can-qgis-export-geospatial-pdf-for-avenza-pdf-map-app>

Hope it helps.
Regards,

Richard


On 21/02/2018 12:11, Tyler Veinot wrote:

All;
I have a college that would like a map of an area, it is a
rather large area, at 1:250. Currently he uses an atlas of grids
but would like one all inclusive map. I tried various things
including QField and QGIS on his computer setup with the data
but he is a bit "technologically challenged" and doesn't quite
like the solution. The area is far too big for export to PDF;
and I tried a locally stored web map. Was wondering if anyone
out there has thoughts on a robust portable electronic map
document that can be exported from QGIS.
Thanks;
Tyler


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Re: [Qgis-user] Zonal Statistics multiple classe

[Kirk Schmidt]

Hi Nicolas:

I would use the SAGA Raster Statistics for polygons tool which which you 
can access through the processing toolbox.




On 2/12/2018 5:38 AM, Nikos Alexandris wrote:
* Nicolas Cadieux <nicolas.cadi...@archeotec.ca> [2018-02-11 23:37:13 
-0500]:



Hi,
I have a raster (int16) with multiple class (ex 1 = grass, 2 = 
trees...) and a vector polygon file.  I want to have the zonal 
statistic (cum, min, max, sum...) for every class.  What is the best 
way to get this done in QGis 2.18.16 on Windows 10?


Thanks,
Nicolas


Nicolas,

not a direct answer, yet if you have access to GRASS' tools, then you 
could look

into v.rast.stats.html [0] (or even r.stats.zonal [1] if you have a
raster version of your "polygons").

If I understand correctly, you want to get statistics per polygon, not
per class. I.e., min, max, sum and the rest, for each class inside
each vector polygon.

v.rast.stats will derive the statistics in question from a raster map
for the parts covered by the vector map. Note, internally, the vector 
map is

converted to a raster.

If you have two rasters, then your base map is the "multiple classes 
map".
Your cover map will be the "rasterised vector polygons", which you 
consider as

the zones to compute the statistics in question within. Very useful,
here, is the `-r` flag: "Create reclass map with statistics as category
labels".

Nikos

[0] https://grass.osgeo.org/grass74/manuals/v.rast.stats.html
[1] https://grass.osgeo.org/grass74/manuals/r.stats.zonal.html


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Re: [Qgis-user] Polygon Dimensioning in QGIS

[Kirk Schmidt]

That works very well Thanks Paulo


On 2/1/2018 12:23 PM, Paolo Cavallini wrote:

Il 01/02/2018 15:28, Kirk Schmidt ha scritto:

One way to work around the issue is to generate a new line layer

it's much simpler, only styling.
if nobody comes up with the solution, bear with me, I'll package a
sample project.
All the best.



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Re: [Qgis-user] Polygon Dimensioning in QGIS

[Kirk Schmidt]

One way to work around the issue is to generate a new line layer 
digitized at the position that you want the finished dimension to show 
up on your graphic or map.  Add a length attribute to the completed 
linse and calculate the length in trhe units of your choice.  This is 
not ideal for a large number of polygons but does work.



On 2/1/2018 5:49 AM, Bernd Vogelgesang wrote:

Oh Paolo, please find the time to find that example ;)
I think there is quite some need for such a function, especially in 
the moving-from-CAD-to-QGIS-community.


Cheers
Bernd


Am 01.02.2018, 10:44 Uhr, schrieb Paolo Cavallini <cavall...@faunalia.it>:

I am sure, we have done it.
I can dig out an example when I find the time.
All the best.

Il 1 febbraio 2018 09:40:39 WET, Andreas Neumann
<a.neum...@carto.net> ha scritto:

I am not so sure if it can be easily done with styling. Perhaps with
geometry generators and labels. But it is definitely not so trivial.

In QGIS 2.x there was a dimensioning plugin:
https://github.com/kalxas/dimensioning

I haven't tried this myself, not sure if and how it works.

Andreas


On 01.02.2018 10:35, Paolo Cavallini wrote:

Il 01/02/2018 09:11, ha...@gbd-consult.de ha scritto:

Dear QGIS-User community, I am looking for
an opportunity in order to create a polygon
dimensioning in QGIS. Do you have any suggestions how
I can do this? -- The result should look like the
picture below. The best case scenario should show the
dimensioning in meter as the unit. I tried the plugin
QAD but it seems like I can not do it within the
plugin. Any assistance is welcome! 


this can be easily done with styling. I agree it could be
more automatic, but it is doable right now. All the best. 





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-- 
Sorry for being short





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Bernd Vogelgesang
Siedlerstraße 2
91083 Baiersdorf/Igelsdorf
Tel: 09133-825374


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Re: [Qgis-user] Why does this message keeps occuring in QGIS? GEOS geoprocessing error: One or more input features have invalid geometry.

[Kirk Schmidt]

Oh, that's simple.  In the upper word menu, under Vector>Geometry Tools> 
Select Multipart to single part. Repeat this for all you polygon layers 
and then your merge should work (I assume you are trying to merge the 
layers).



On 1/16/2018 12:48 PM, David Shi wrote:

Hi, Kirk,

To make it simple, how to convert all polygons into simple polygons?

Regards,

David


On Tuesday, 16 January 2018, 14:09, Kirk Schmidt 
<k...@nortekresources.com> wrote:



This usually occurs when you try to merge features that are mixed 
single and multipart lines or polygons. Simply use vector geometry 
tools to convert from one type to another.


On 1/16/2018 7:53 AM, David Shi wrote:
How to resolving this issue?



Regards,

David




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Re: [Qgis-user] Why does this message keeps occuring in QGIS? GEOS geoprocessing error: One or more input features have invalid geometry.

[Kirk Schmidt]

This usually occurs when you try to merge features that are mixed single 
and multipart lines or polygons. Simply use vector geometry tools to 
convert from one type to another.



On 1/16/2018 7:53 AM, David Shi wrote:

How to resolving this issue?



Regards,

David




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Re: [Qgis-user] ctrl-c selection issue

[Kirk Schmidt]

After a few selections, you may have to close and reopen qgis to purge 
the memory as well. Importing a csv is memory intensive so another 
approach is to try saving as a spatial database (SQLite) or even a 
shapefile.  Once written, you can load the spatial file and you should 
have lots of memory to keep selecting points.


Kirk

On 1/9/2018 4:58 PM, Ramon Andinach wrote:
I’m not sure what the problem is, but if I were doing that repeatedly, 
I’d probably use Layer -> Save As, tick the Save Only Selected 
Features box and save it to CSV.  Then muck about with excel later.


This way ought to be a bit lighter on the memory.


Ramon.
On 10 Jan 2018, at 04:25, Jeroen Hovens <m...@groenebij.nl 
<mailto:m...@groenebij.nl>> wrote:


Hi,
Using qgis 2.14.18 I have been working today with a large csv file 
(7.5 mln objects). I just need selections of this database which I 
can then modify in excel. So I opened the attribute table and made a 
selection based on a specific value for an attribute, and copied that 
selection (about 30.000 objects) via the clipboard (ctrl-c) to a new 
Microsoft Excel file, then saved the excel file and repeated the 
process for another selection. This worked perfect for some time. 
However, some selections won’t copy: when I press the copy button the 
programs turn to ‘not responding’ and won’t snap out of it anymore. 
 Selection size when this happens is about the same (about 20k to 35k 
objects).
What could be the problem? Could the data be corrupted? How can I 
check what is wrong?

Thank you
Gr.
Jeroen
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