Hi Aron,
Seems like you're dealing with large dataset?
A few things you can try.
* Make sure the datasets your running analysis on, or carrying out
spatial joins on, all datasets have a Spatial Index. This can be done by going
into the Layer Properties and under Source, click Create
Hi Sofia,
I unfortunately am unable to access the files you sent, as there are
restrictions on our systems here in relation to accessing files.
Apologies for that.
Kind Regards,
Richard
——
Richard McDonnell MSc GIS, FME Certified Professional
Flood Risk Management - Data Management
——
Oifig
Hi Sofia,
So I will start from the beginning, hopefully I understand your query properly…
1. Add your Raster to the Canvas
2. Using the Data Source Manager and Delimited Text, I add the CSV,
making sure the Headers, Columns and rows are correct, while also
setting/specifying the
Hi Andrew,
One probable solution is to save the new style as the default, for the Layer.
Kind Regards,
Richard
——
Richard McDonnell MSc GIS, FME Certified Professional
Flood Risk Management - Data Management
——
Oifig na nOibreacha Poiblí
Office of Public Works
Sráid Jonathan Swift, Baile Átha
Hi Nuno,
As usual there are a number of ways to do this. Grass: r.resamp.stats as Em
suggested would work, but might I also suggest the Warp tool, based on
gdal_warp.
This can be found by going to the Menu bar select Raster, Projections and Warp.
Parameters:
Input Layer
Set this to the Raster
Hi Sibylle,
To extract the Bioregions, I suggest you utilise the option Selected features
only which is a tick box below, where you select Mask layer. All you need to do
is select, on the map canvas, the bioregion you want to extract.
QGIS is capable of loading Tiff's I use them exclusively in
Hi Simon,
Not an IT person, but there are a number of formats, supported by gdal which
don't, by default install. This is due to them requiring a separate licencing
agreement.
You will need to manually install these, in the setup app, by using the
Advanced install and under Select Packages,
Hi Richard,
You can indeed load others.
From the layer properties, select the style button, usually bottom left. Then
select Load Styles, all other styles in the database will be listed there. You
can select any other ones you set up for that layer from there.
Kind Regards,
Richard.
——
You can also use the processing toolbox, search for split and you should be
able to access the tool.
--
Richard McDonnell MSc GIS, FME Certified Professional
Geographical Information Systems Officer
--
Oifig na nOibreacha Poiblí
Office of Public Works
Sráid Jonathan Swift, Baile Átha Troim,
Hi Chiz,
The only thing I can think of is Split Vector Layer (Vector => Data Management)
that will allow you to split your Layer by attribute, outputting a DXF for each
layer.
The only issue is that you will have a series of separate Layers which you will
have to manually merge into a single
Hi,
One solution is to use Warp, found under Raster --> Projections --> Warp
(reproject)
This will allow you to specify a resolution and also change the file type.
Kind Regards,
Richard
——
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management
——
Oifig na nOibreacha Poiblí
Hi Jaume,
I'm making the assumption that your styling is saved in the Project File and
not as a Style for the Layer itself.
Might I suggest that you create a default style for each layer, this can easily
be done by going to the Layer Properties and clicking on the Style button on
the bottom
Michael,
In addition to what Nyall said, might I suggest another possible method for you
doing it.
Instead of selecting and deselecting, how about you use a virtual field? To
sort/filter the river names.
1) Using the field calculator, create a virtual field and call it,
"filter" and set
Apologies,
I forgot to include the list in my response Grant, please see below.
Kind Regards,
Richard
--
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management
--
Oifig na nOibreacha Poibl?
Office of Public Works
Sr?id Jonathan Swift, Baile ?tha Troim, Co na M?, C15 NX36
Hi Rajesh,
The SCP Plugin is now running using a new Python Library called
"remotior-sensus", which you will have to load yourself, as it doesn't form
part of the standard list of QGIS Python Library's.
Further details and instillation instructions can be found
Hi Molly,
As you are aware, the SCP uses the polygons to create classifications. As you
have already got this, you could just try Reclassify by Table.
I have not tested this for your specific requirements, but you can add in rows
for each classification and specify your ranges.
I’m not sure of
Hi Grant,
The syntax is as follows...
For three separate single band Images
-A input1.tif --A_band=1 -B input2.tif --B_band=1 -C input3.tif --C_band=1
...
For a single raster multiple bands...
-A input1.tif --A_band=1 -B input.tif --B_band=2 -C input.tif --C_band=3
..
Hi Grant,
I have not tied it, but one possible solution is to use the additional command
-line parameters to specify the Bands, it might be worth a try..
Kind Regards,
Richard
--
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management
--
Oifig na nOibreacha Poibl?
Office of
ichard
> McDonnell via QGIS-User
> Sent: 27 September 2023 09:22
> To: Garth Fletcher ; asiajmur...@gmail.com
> Cc: qgis-user@lists.osgeo.org
> Subject: Re: [Qgis-user] opening .sid files in QGIS
>
> Hi Jeremy,
> Garth is indeed right. MrSID is not open source, therefore it's
Hi Jeremy,
Garth is indeed right. MrSID is not open source, therefore it's not installed
by default.
Thankfully it's easy to install, I can only give you instructions for Windows
though.
1) Open OSGeo4W Setup
2) Select Advanced Install
3) Install from Internet
4) Keep clicking Next until
Thomas,
I’m open to correction on this, but meters would generally be the default unit
used in GIS, when dealing with metric datasets.
What units you use to measure on your Map Canvas or store as attribution is
then a different thing.
I had a look for the EPSG codes for EASE2 but all I could
Hi Javier,
DWG files are proprietary and can have changes between versions. For this
reason, AutoCAD allows users to save there drawings to various versions
including.. 2018, 2013, 2010, 2007, 2004, 2000 and R14...
I've found when sending CAD data to 3rd parties that saving to an older DWG
Hi All,
It appears that, when you georeference an image which already contains
reference information it in effect applies a shift to the outputs.
One solution might be one of the options suggested
Hi Salvatore,
You could try:
1. Selecting/Highlighting Polygon 1, which should also highlight the area
you want to cut into area 4.
2. Using the Split Features tool, you can then create a cutline to clip
it successfully, something like what’s shown below in green, should work.
The
My Steps...
1)Use the OSGeo4W Installer to uninstall everything
2)Delete the OSGeo4w Folder
3) Delete the QGIS folders in C:\Users\...SomeUserName...\AppData\Roaming\QGIS
Do a restart of the computer, which should clear most of the stuff.
Then you can do a fresh Install if you require.
Kind
Hi Simon,
Apologies, I didn't quite understand what you were trying to do. So let's start
from the beginning again.
Thank you for sending on a sample, it helps greatly to understand what you are
trying to do. Im still not 100% on what you are trying to achieve, so I have
included two separate
Hi Simon,
You don't mention the field name in QGIS, but in the example below, I will use
"TEST"
Create a new field, giving it a name, it can be "RefName" if you like, you can
then create an expression like
CASE WHEN " TEST " ='symbolLayer0' THEN 'SomeOtherStringA'
WHEN " TEST " ='symbolLayer1'
Hi All,
I would like to just throw my two cents in on this.
If Raster processing is envisaged, push it out to 32 minimum 64 recommended and
128 if you can stretch.
As for Processors, you need as many Threads as you can afford, with a good base
clock.
I would agree with the use of SSD I would
Hi Grant,
My advice would be to have a shared drive, or network drive, which both
machines access with the same path.
But...in the absence of that, you could also modify your path if you prefer...
The Filepath attribute could be shortened/modified, and you can manually set
the start of the path.
Hi Grant,
Do you mean insert a GeoTIFF in?
If that's the case, then you want the following Action..
Type: Python
Description: Add Raster to Canvas or whatever you want
Action Text:
qgis.utils.iface.addRasterLayer('[%filepath%][%filename%]','[%filename%]')
For the above to work, you will need
Andrea,
I believe what Riccardo is getting at is that while an "ESRI Shapefile" (*.shp)
always will have MultiPolygon as its Geometry Type, the "Polygons" within the
shapefile are unique individual geometries.
We have this requirement in our own organisation, in reaction to Shapefiles,
there
.ie>
——
Email Disclaimer:
https://www.gov.ie/en/organisation-information/439daf-email-disclaimer/<https://www.opw.ie/en/disclaimer/>
From: QGIS-User On Behalf Of Richard
McDonnell via QGIS-User
Sent: 09 May 2023 09:27
To: andrea antonello
Cc: qgis-user@lists.osgeo.org
Subject: Re
Hi Andrea,
If you are ok substituting the method you are using for GDAL, then you can use
the following..
gdal_calc.py -A input.tif --outfile=result.tif --calc="(A>=-2000)*(A<=1500)"
--NoDataValue=-
You can also implement this in QGIS using GDAL Calculator from the Processing
Toolbox, It
Hi Riccardo,
Have you tried, after you delete your rows, disabling editing and then enabling
editing again before you add your new rows?
Also have a look at this
https://gis.stackexchange.com/questions/132346/is-there-a-way-of-auto-increment-for-the-id-column-in-qgis
Regards,
Richard.
--
Hi Riccardo,
You can use the Processing Toolbox, so a search for Promote to multipart.
This will create a new layer, which will have all geometries converted to
multipart.
Kind Regards,
Richard
--
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management
--
Oifig na
Hi Gino,
From the screengrab you forwarded to me, I am inclined to agree with Richard.
The data appears to be looking fine. You, as Richard said should probably use
background mapping to verify the location but besides that it looks fine.
I have been on the Global Wind Atlas website, and looked
Hi Gino,
Just to echo what Richard Duienvoorde said, QGIS should handle GeoTIFF
perfectly fine. I use the format myself when working with raster's in QGIS.
First question's I would ask would be:
1)Are you getting any error messages when you load the Raster? What are they??
2)Is the Raster
Hi,
Im not sure but maybe have a look at "Attribute table row cache".
Settings, Options, Data Sources then Attribute table row cache
On mine its set to 10,000 and Ive never had any issues Regards,
Richard
——
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management
——
Oifig
Hello all,
I'm looking for some advice in relation to Geometry Error detection. We have a
proprietary tool, which can validate geometries in line with OGC, which is
flagging geometries as having holes outside of area. Indeed when I check the
vertices I can see the issue, with the "Holes"
Hi,
Just to add to what Nyall said.
See link below, which suggests a way using OGR to carry out the process you
require.
https://gis.stackexchange.com/questions/324848/transform-datum-csv-csv-using-ogr2ogr
It suggests you preform your horizontal transformation first, this can be done
in QGIS,
PostGIS with Geometry Index's?!
Set up Styles with Zoom Levels so as when zoomed in to 1:5000, that's the only
time you have full LOD
--
Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management
--
Oifig na nOibreacha Poibl?
Office of Public Works
Sr?id Jonathan Swift, Baile
Hi Grant,
What I meant is that, using the Field calculation you can create new fields for
each thing you want to style. In your case you want a field for colour.
Using the field calculator you can set up a script, for example...
CASE
WHEN "class" = 'Igneous' THEN '#fc9403'
WHEN "class" =
Morning,
I'm not sure if this is a solution for you, but have you considered using
attribution and storing your styling requirements as a set of attribute values.
You can do this for Fill Colour, Stroke Thickness, Font, Sizes...etc...
You could build a graphic modeller to add the attribution to
Andrea,
Thank you for the clarification and the work around!
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,
Hi All,
Im currently running the Following
QGIS version
3.28.1-Firenze
Qt version
5.15.3
Python version
3.9.5
GDAL/OGR version
3.6.0
PROJ version
9.1.0
EPSG Registry database version
v10.074 (2022-08-01)
GEOS version
3.11.1-CAPI-1.17.1
SQLite version
3.39.4
PDAL
Hi,
So the underlying data might not be very efficient, for example, no internal
Tiling, or compressions used.
What I would suggest is…
1. Create a VRT of all the data you have.
2. Using GDAL Translate convert the VRT into a GeoTiff, with the following
a. NoData Value of
Easiest way I can think of doing what you want is to create a VRT of the three
raster’s.
Raster ==> Miscellaneous ==> Build Virtual Raster
When you do this set the Nodata value to 0 (the default transparent value form
the Georeference Tool)
This should create a merged raster for you and allow
Hi Walter,
As an alternative to Wouter’s suggestion, I would recommend VRT’s (Raster ==>
Miscellaneous ==> Build Virtual Raster) Not alone does it merge/mosaic but it
also results in a small file size. It is also very easy to generate convert
that VRT to any other format output, using
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