Re: [Qgis-user] Fwd: Export data with tiff and csv files in QGIS 3.36.3

[Richard McDonnell via QGIS-User]

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 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 
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From: ΣΟΦΙΑ ΤΣΙΤΟΥ 
Sent: 11 June 2024 14:34
To: Richard McDonnell 
Cc: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Fwd: Export data with tiff and csv files in QGIS 3.36.3

[https://ssl.gstatic.com/docs/doclist/images/icon_10_generic_list.png] 
igme5000.tif[X]
Dear Richard,

Thank you very much for your quick response. I followed this procedure many 
times but unfortunately I gοt null values. Attached you can find the files that 
I used (two different tiff maps-I use one map each time- and one csv file with 
the coordinates). I can't find out if there's a problem with my files or 
something I'm not doing right in the process.

Thank you.

Warm regards,
Sofia Tsitou

Στις Τρί 11 Ιουν 2024 στις 3:42 μ.μ., ο/η Richard McDonnell 
mailto:richard.mcdonn...@opw.ie>> έγραψε:
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 X, Y and Z fields (as required)

3.   This will result in a Point Dataset being added to the Canvas, with 
the CSV loaded as a temporary layer

4.   In the Processing Toolbox search bar, type “sample” and then select 
Sample raster values

a.   Input layer set to the Point Dataset

b.   Raster Layer set to the Raster you want to analyse

c.   Output column Prefix is handy if you have multiple datasets you want 
to sample, as you can change this for each subsequent sample.

d.   Sampled you can specify a Location for your output dataset, or you can 
leave it as a temporary layer until you have carried out all sampling.

I hope that clarifies things,

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 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/

From: QGIS-User 
mailto:qgis-user-boun...@lists.osgeo.org>> 
On Behalf Of S?F?? ?S via QGIS-User
Sent: 11 June 2024 12:52
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Fwd: Export data with tiff and csv files in QGIS 3.36.3


Dear QGIS team,

I have two maps in tiff format and coordinates in csv format and I try through 
zonal statistics and sample raster values to export the data but it gives me 
null values. Could you tell me the steps to extract the data because I might be 
making a mistake?

Thank you in advance,
Sofia Tsitou
--
Tsitou Sofia

Αdjunct Lecturer
Department of Economics
University of Ioannina
Greece

Post Doctoral Fellow
Department of Economics
University of Macedonia, Thessaloniki
Greece

Research Fellow
DAISSy Research Group
Hellenic Open University
Greece

e-mail: sofitsi...@gmail.com
Homepage: https://sites.google.com/view/sofiatsitou/home 



--
Tsitou Sofia

Αdjunct Lecturer
Department of Economics
University of Ioannina
Greece

Post Doctoral Fellow
Department of Economics
University of Macedonia, Thessaloniki
Greece

Research Fellow
DAISSy Research Group
Hellenic Open University
Greece

e-mail: sofitsi...@gmail.com
Homepage: https://sites.google.com/view/sofiatsitou/home 



--
Tsitou Sofia

Αdjunct Lecturer
Department of Economics
University of Ioannina
Greece

Post Doctoral Fellow
Department of Economics
University of Macedonia, Thessaloniki
Greece

Research Fellow
DAISSy Research Group
Hellenic Open University
Greece

e-mail: sofitsi...@gmail.com
Homepage: https://sites.google.com/view/sofiatsitou/home 

Re: [Qgis-user] Fwd: Export data with tiff and csv files in QGIS 3.36.3

[Richard McDonnell via QGIS-User]

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 X, Y and Z fields (as required)

3.   This will result in a Point Dataset being added to the Canvas, with 
the CSV loaded as a temporary layer

4.   In the Processing Toolbox search bar, type “sample” and then select 
Sample raster values

a.   Input layer set to the Point Dataset

b.   Raster Layer set to the Raster you want to analyse

c.   Output column Prefix is handy if you have multiple datasets you want 
to sample, as you can change this for each subsequent sample.

d.   Sampled you can specify a Location for your output dataset, or you can 
leave it as a temporary layer until you have carried out all sampling.

I hope that clarifies things,

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 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/
From: QGIS-User  On Behalf Of S?F?? ?S 
via QGIS-User
Sent: 11 June 2024 12:52
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Fwd: Export data with tiff and csv files in QGIS 3.36.3


Dear QGIS team,

I have two maps in tiff format and coordinates in csv format and I try through 
zonal statistics and sample raster values to export the data but it gives me 
null values. Could you tell me the steps to extract the data because I might be 
making a mistake?

Thank you in advance,
Sofia Tsitou
--
Tsitou Sofia

Αdjunct Lecturer
Department of Economics
University of Ioannina
Greece

Post Doctoral Fellow
Department of Economics
University of Macedonia, Thessaloniki
Greece

Research Fellow
DAISSy Research Group
Hellenic Open University
Greece

e-mail: sofitsi...@gmail.com
Homepage: https://sites.google.com/view/sofiatsitou/home 



--
Tsitou Sofia

Αdjunct Lecturer
Department of Economics
University of Ioannina
Greece

Post Doctoral Fellow
Department of Economics
University of Macedonia, Thessaloniki
Greece

Research Fellow
DAISSy Research Group
Hellenic Open University
Greece

e-mail: sofitsi...@gmail.com
Homepage: https://sites.google.com/view/sofiatsitou/home 

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Re: [Qgis-user] Raster reverts to old Min/Max

[Richard McDonnell via QGIS-User]

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 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/
From: QGIS-User  On Behalf Of Drew French 
via QGIS-User
Sent: 28 May 2024 15:27
To: QGIS List 
Subject: [Qgis-user] Raster reverts to old Min/Max

Hi all,
I have two DEMs, one is the whole USA, the other is a watershed. They obviously 
have two different raster Min/Max levels, based on elevation. When I adjust the 
watershed DEM to my liking, I then right click, copy the style, and right click 
the USA DEM to paste the style. So far, so good, I did this a thousand times in 
the past without a problem. Now, though, when I adjust anything in the USA DEM, 
it reverts right back to the old Min/Max. Anybody else have this issue and what 
do you think is going on?
Using 3.34.1 Prizren

--
Andrew French
(715) 986-8088
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Re: [Qgis-user] RASTER RESOLUTION REDUCING

[Richard McDonnell via QGIS-User]

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 you want to resample

Source/Target CRS
If you’re not transforming your dataset to another CRS then you can leave these 
alone, but you can also set these to the value of the Raster CRS
Resampling method to use
As you are looking for the average of the Pixel values, you can select Average 
here.

No Data value for output Bands:
Set if required

Output file resolution……:
This is the one of most interest to you, here you can set the resolution of the 
output to 2500

Reprojected:
Specify the Location and Filename that you want the new Dataset to have, you 
can leave it blank if you like for a Temporary file to be created.

Hope this helps!
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 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/
From: QGIS-User  On Behalf Of Emma Hain via 
QGIS-User
Sent: 14 May 2024 02:20
To: Nuno Manuel de Figueiredo de Santos Loureiro 
Cc: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] RASTER RESOLUTION REDUCING

Hi Nuno
Apologies in advance, I am no raster specialist, but perhaps try using some of 
the other tools such as Grass: r.resamp.stats

To get the information, would the GDAL Raster Information 
tool
 assist?

Cheers
Em

On Tue, 7 May 2024 at 23:16, Nuno Manuel de Figueiredo de Santos Loureiro via 
QGIS-User mailto:qgis-user@lists.osgeo.org>> wrote:
Dear all,

I need to reduce the resolution of a raster, from a 30 meter pixel to a 2500 
meter pixel.
Performing this operation via "Creating new layers from an existing layer" and 
using the "Resolution" raster parameter is very easy.
But the value of the new 2500 meter grids is not the average of the values ​​of 
the 30 meter grids.

How can I determine that in the destination grids its value is the average of 
the values ​​in the original grids?

Suggestions will be very welcome!

Grateful,

Nuno
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Emma Hain — Product Manager/Senior GIS Analyst
e...@north-road.com
[https://north-road.com]

North Road
Cartography • Development • Spatial Analysis

north-road.com
[https://ci3.googleusercontent.com/mail-sig/AIorK4xbsQ72BNIM2cWMZcuEKVer1Bwaq_gqYkdbtrjK2ifrqv-4o7aWjcvilgYXtNGpXLNgD00xgmQ][https://ci3.googleusercontent.com/mail-sig/AIorK4zEBWGJKio8gqmFT0h_51t4ZnmoGgbmV7SeL-4FKvwWApFWDWyK7p-c0-cSskUe7pjQzjEZj9Q][https://ci3.googleusercontent.com/mail-sig/AIorK4wlMciFPm8hqQZB_Qi57PUCv1dJqUC1A2i9qEMzWRFLcJ7Jil30YnULdJLxT6-qMfI6J4kcac4]


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Re: [Qgis-user] merging parts from various raster files

[Richard McDonnell via QGIS-User]

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 any Raster work I 
do. The virtual raster is just an 
easy way for you to merge/mosaic the raster's (10-12 Raster's) together into a 
single raster.
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 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/
From: QGIS-User  On Behalf Of Sibylle 
Stöckli via QGIS-User
Sent: 30 April 2024 14:10
To: 'Frank Broniewski' ; qgis-user@lists.osgeo.org; 
broniew...@a-a.lu
Subject: Re: [Qgis-user] merging parts from various raster files

Hello Frank and Richard
,
I have 10-12 raster files (figure 1, .tif files), they all look the same and 
cover the entire country with no definition of the biogeregions.
Second there is the shape file defining the biogeoregions (figure 2, different 
colors).

-  Probably I first need to extract the different biogeoregions out 
from each raster file or define the linkage between the raster files the the 
biogeoregions in the shape file. However, raster - crop raster based on layer 
mask extracts the entire mask (entire country) not the different biogeoregions.
-  Furter I may delete all the data in the raster files not needed: 
e.g. in raster 1  just data on biogeo 1, but not the other biogeoregions, in 
raster 2, data on biogeo 2, but not the other biogeregions. By doing so there 
will be no overlap, as each raster file consists only one biogregions.
-  I am not sure about the virtual raster, because it is not possible 
to import .tif files.
-  Then I may just use the "merge" function - merging each bioregions.

Background: postprocessing of a model output. It was not possible to run the 
model only for biogeoregion 1 (with input data from biogeoregion 1) , bioregion 
2 (with input data from bioregion 2) etc. It was necessary to model the entire 
country with input data from bioregion 1 etc.

Kind regards
Sibylle


Figure 1
[cid:image003.jpg@01DA9B0B.B9FA38E0]
Figure 2
[cid:image005.jpg@01DA9B0B.B9FA38E0]
From: Frank Broniewski mailto:broniew...@a-a.lu>>
Sent: Tuesday, April 30, 2024 1:48 PM
To: qgis-user@lists.osgeo.org; 
sibylle.stoec...@gmx.ch
Subject: AW: [Qgis-user] merging parts from various raster files

Hello Sybille,

I am not sure if I understand your problem correctly. I assume, you have a 
mosaic of raster files (that overlap) and you want to create a single raster 
file for statistical analysis. In my opinion, the easiest way to achieve that 
is to create a virtual raster (VRT) and either use that for stats or create a 
new raster file from the VRT. You can find the tool in the processing toolbox. 
With the tool you can even define the resolution, if mixed, and how the VRT 
should be resampled.

HTH
Frank

https://docs.qgis.org/3.34/en/docs/user_manual/processing_algs/gdal/rastermiscellaneous.html#build-virtual-raster

Von: QGIS-User 
mailto:qgis-user-boun...@lists.osgeo.org>> 
im Auftrag von Sibylle Stöckli via QGIS-User 
mailto:qgis-user@lists.osgeo.org>>
Gesendet: Dienstag, 30. April 2024 11:34
An: qgis-user@lists.osgeo.org 
mailto:qgis-user@lists.osgeo.org>>
Betreff: [Qgis-user] merging parts from various raster files

Dear community

I am working with QGIS 3.34 (Prizren) and would like to merge region 1 from
raster (.tif) file 1 and region 2 from raster file 2, and...
For sure I will need to use raster-miscellaneous-merge.

My question is related to the pre-processing of the input raster files.
- The 12 raster files all have the same coordinate system.
- The raster files are fully overlapping (the entire country).
- The region is not defined per se in the raster file, but in an additional
shape file (biogeo.shp).
- For sure I can carry out some zonal statistics using raster and shape
file, but to merge the regions I need all the pixels form a regions as input
file for the merging process. This process is more than just selecting
regions or cropping. Do you have any suggestions?

Kind regards
Sibylle

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Re: [Qgis-user] Installing gdal-mrsid with osgeo4w-setup.exe command fails

[Richard McDonnell via QGIS-User]

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, Libs select dgal-mrsid.
You can use the Search to help find it and other formats like ECW (gdal-ecw).
Hope that helps,

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 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 
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Email Disclaimer: 
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--
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--
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From: QGIS-User  On Behalf Of Simon 
Gröchenig via QGIS-User
Sent: 29 March 2024 07:10
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Installing gdal-mrsid with osgeo4w-setup.exe command fails

Hi all,

a customer installs qgis with the following command at Baramundi.

path/to/osgeo4w-setup.exe
 -q -A -L -l 
\\url.com\apps\qgis\_Deployment\Repo\
 -a x86_64 -g -k -P qgis gdal-mrsid -o -k

While QGIS is installed fine, gdal-mrsid is silently failing (cannot load 
sid-files in QGIS). The problem occurs since upgrading to QGIS 3.36.

The installation works using the setup.exe graphical app.

Any ideas?

Best regards
Simon


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Re: [Qgis-user] Multiple styles saved in database, how to choose one?

[Richard McDonnell via QGIS-User]

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.






——
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, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
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https://gov.ie/opw

——
To send me files larger than 30MB, please use the link below 
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Email Disclaimer: 
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——
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, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
——
M +353 87 688 5964   T +353 46 942 2409
https://www.opw.ie

——
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.opw.ie/en/disclaimer/
> -Original Message-
> From: QGIS-User  On Behalf Of Richard
> Duivenvoorde via QGIS-User
> Sent: 15 March 2024 10:20
> To: Qgis-user@lists.osgeo.org
> Subject: [Qgis-user] Multiple styles saved in database, how to choose one?
>
> Hi,
>
> I'm busy loading a lot of datasets in a Postgis database.
>
> For vectordata it is possible to save the QGIS style IN the database.
> Off course you can save several styles for the same table in the database.
> But I fail to find a way to choose between those.
>
> Am I missing an option? Or is this not yet implemented?
> (would be cool to have it in Browser too :-) )
>
> Thanks in advance,
>
> Richard Duivenvoorde
>
> PS: I was also missing this option for Raster files (saved in Postgis).
> Created a Feature Request for that one:
> https://github.com/qgis/QGIS/issues/56870
>
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Re: [Qgis-user] Convert .shp to CAD, with attribute values as different layers

[Richard McDonnell via QGIS-User]

You can also use the processing toolbox, search for split and you should be 
able to access the tool.


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Geographical Information Systems Officer

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From: Chiz Harward 
Sent: 13 February 2024 13:03
To: Richard McDonnell 
Cc: qgis-user@lists.osgeo.org
Subject: RE: Convert .shp to CAD, with attribute values as different layers

Thanks all, will try and do this as soon as I can get the Vector drop down list 
to actually drop down... is there a keyboard shortcut to get to the options? 
Ctrl+O isn't working

Chiz Harward BA MCIfA he/him
Senior Archaeologist, Urban Archaeology

I work flexibly - so whilst it suits me to email now, I do not expect a 
response or action outside of your own working hours

http://urban-archaeology.blogspot.com
https://www.facebook.com/urb.arch/
http://gloscross-slabs.blogspot.co.uk/

Urban Archaeology
2 Slad View,
Gaineys Well,
Stroud,
Gloucestershire
GL5 1LQ
07881 486837
c...@urban-archaeology.co.uk

Urban Archaeology is a trading name of Chiz Harward BA MCIfA

From: Richard McDonnell 
mailto:richard.mcdonn...@opw.ie>>
Sent: Tuesday, February 13, 2024 11:16 AM
To: Chiz Harward 
mailto:c...@urban-archaeology.co.uk>>
Cc: qgis-user@lists.osgeo.org
Subject: RE: Convert .shp to CAD, with attribute values as different layers

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 dxf file.

One other consideration would be, splitting the single layer by attribute in 
QGIS as separate Layers and then exporting the Project.
Sorry I can't be of more help, there's probably a way, using Python, to carry 
out the split and write out a single DXF, but I can't help you there.
Kind Regards,

Richard



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From: QGIS-User 
mailto:qgis-user-boun...@lists.osgeo.org>> 
On Behalf Of Chiz Harward via QGIS-User
Sent: 13 February 2024 10:04
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Convert .shp to CAD, with attribute values as different 
layers

Hallo, I have a shapefile that has attributes and need to convert this to a CAD 
file. I can do this by export project to dxf, but it comes through with one CAD 
layer per shapefile. I need to have the shapefile come through as different CAD 
layers according to one of the attribute fields.

Example: Shapefile contains many polygons, the attribute field 'colour' of each 
polygon can be red, blue, green etc. I need it to get it into CAD with a layer 
for the red polygons, one for the blue, one for green etc

Running QGIS 3.16.11 Hannover
Any help appreciated

Chiz Harward BA MCIfA he/him
Senior Archaeologist, Urban Archaeology

I work flexibly - so whilst it suits me to email now, I do not expect a 
response or action outside of your own working hours

http://urban-archaeology.blogspot.com

Re: [Qgis-user] Convert .shp to CAD, with attribute values as different layers

[Richard McDonnell via QGIS-User]

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 dxf file.

One other consideration would be, splitting the single layer by attribute in 
QGIS as separate Layers and then exporting the Project.
Sorry I can't be of more help, there's probably a way, using Python, to carry 
out the split and write out a single DXF, but I can't help you there.
Kind Regards,

Richard



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Geographical Information Systems Officer

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From: QGIS-User  On Behalf Of Chiz Harward 
via QGIS-User
Sent: 13 February 2024 10:04
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Convert .shp to CAD, with attribute values as different 
layers

Hallo, I have a shapefile that has attributes and need to convert this to a CAD 
file. I can do this by export project to dxf, but it comes through with one CAD 
layer per shapefile. I need to have the shapefile come through as different CAD 
layers according to one of the attribute fields.

Example: Shapefile contains many polygons, the attribute field 'colour' of each 
polygon can be red, blue, green etc. I need it to get it into CAD with a layer 
for the red polygons, one for the blue, one for green etc

Running QGIS 3.16.11 Hannover
Any help appreciated

Chiz Harward BA MCIfA he/him
Senior Archaeologist, Urban Archaeology

I work flexibly - so whilst it suits me to email now, I do not expect a 
response or action outside of your own working hours

http://urban-archaeology.blogspot.com
https://www.facebook.com/urb.arch/
http://gloscross-slabs.blogspot.co.uk/

Urban Archaeology
2 Slad View,
Gaineys Well,
Stroud,
Gloucestershire
GL5 1LQ
07881 486837
c...@urban-archaeology.co.uk

Urban Archaeology is a trading name of Chiz Harward BA MCIfA

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Re: [Qgis-user] Amal Kar - India - Batch conversion of files for raster layer format from geotiff to idrisi, and simultaneously from a higher pixel resolution to a lower one.

[Richard McDonnell via QGIS-User]

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


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FRM Data Management

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From: QGIS-User  On Behalf Of Amal Kar via 
QGIS-User
Sent: 11 January 2024 08:16
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Amal Kar - India - Batch conversion of files for raster 
layer format from geotiff to idrisi, and simultaneously from a higher pixel 
resolution to a lower one.

Dear Community Members,
I am currently trying to make use of a series of Raster data files from Modis 
satellite sensors that are available in Geotiff format (.tif) and in the pixel 
resolution of 500-m.
I downloaded the files from a USGS website, and wanted to convert each file 
into an Idrisi raster format (16 bit integer elevation data in .RST & .RDC 
files), and in 1-km pixel resolution.
I am using the batch convert utility in my QGIS (ver. 3.18; Zurich) within the 
GDAL Toolbox, especially its "Translate (Convert Format)" utility under "Raster 
Conversion".
While this utility converts all the files from .tif to .rst & .rdc very quickly 
and accurately, it does not have any scope of changing the pixel resolution 
(i.e., from pixel width & height of 0.00417 arc degrees for 500 m pixels to the 
width & height of 0.00833 arc degrees for the desired 1-km pixels).
When i do the conversion of files individually by opening each .tif raster file 
and then exporting each ("Save as") to idrisi format, it opens a new window of 
"Save Raster Layer as", where the options are for changing the 
"Resolution", both horizontal and vertical.
However, changing each data file through this process, especially when i am 
dealing with a few hundreds of daily satellite data files, is very cumbersome. 
There must be some clickable tool  hidden within the Tool Box, which i am too 
naive to understand and pick up (i am NOT computer-savvy, although i use it 
more often for digital analysis of my earth surface data in GIS).
I shall be highly grateful if you can lead me to the appropriate tool in my  
QGIS (ver. 3.18; Zurich), which can be easily followed.
Thanking You for Your patience, and with Kind Regards,
amal kar.
-- -- --

--
Dr. Amal Kar
Former Principal Scientist and Head, Division of Natural Resources & 
Environment,
Central Arid Zone Research Institute, Jodhpur 342003, India
A-1/6, Baitalik Housing Society, KMDA Housing Complex,
Baghajatin (Near Hiland Park),
KOLKATA 700 094, India
Email: akarca...@gmail.com


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Re: [Qgis-user] How to convert qml style file from version 3.28.6 to 3.16.14

[Richard McDonnell via QGIS-User]

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 Left and selecting Save as Default. This will result in a default 
style for the Layer so it doesn't matter what version of QGIS you use, or 
indeed what project you load the layer into, it will use the default style. You 
can also manually do this, by saving the style with the same name as the 
dataset.

The same can be done for all layers, Vector or Raster. It will even do it for 
PostGIS Layers, saving the style in a new table called style in the public 
schema in your Database.

I hope the above helps.
Kind Regards,

Richard




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FRM Data Management

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From: QGIS-User  On Behalf Of Rigola C Jaume 
INFORMACIO DE BASE via QGIS-User
Sent: 08 January 2024 13:13
To: 'qgis-user@lists.osgeo.org' 
Subject: [Qgis-user] How to convert qml style file from version 3.28.6 to 
3.16.14

For reasons that are not relevant to this discussion I have two versions of 
QGIS installed on my Desktop (3.16.14-Hannover & 3.28.6-Firenze).

I have realised that when a project is saved at 3.28.6-Firenze version, the 
symbology styles are lost if opened with QGIS 3.16.14-Hannover. I've browsed 
for solutions, and I read that that's an issue since version 3.22, but I 
couldn't find a way to solve it.

Does anyone know how to save the layer stlyles on 3.28.6-Firenze  so they can 
be recovered on 3.16.14-Hannover? (Maybe a version conversor, or a QML file 
conversor)

Many thanks in advance,

Jaume


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Re: [Qgis-user] Reselect Features

[Richard McDonnell via QGIS-User]

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 all values to 1 or 0, based on something like... CASE WHEN 
river_name = 'SomeRiverName' THEN  1 ELSE 0 END (expression may have some 
errors)
2)  Style your Layer using the "filter" value as your classification and 
set 0 as Invalid and 1 as Valid.

You should then be able to see only the geometries with the valid name and spot 
the gaps.
If instead of selecting and deselecting, you use the filter column to edit the 
filter attribute to 1 or 0 you can add or remove features until you have what 
you want. You can also set the attribute table to display only what is visible 
on canvas, which may also help.
Hopefully the above helps
Kind Regards,

Richard




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

——
Oifig na nOibreacha Poiblí
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Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
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FRM Data Management

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Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
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> -Original Message-
> From: QGIS-User  On Behalf Of Michael
> Edward McNeil via QGIS-User
> Sent: 17 November 2023 02:48
> To: Andrea Giudiceandrea 
> Cc: qgis-user@lists.osgeo.org
> Subject: Re: [Qgis-user] Reselect Features
>
> Thank you for your reply, Andrea. I'll be glad to describe the situation and 
> what
> I'm doing.
>
> I'm running Qgis 3.23.3 for Windows (Windows 11), which is the regular
> environment I'm now working Qgis in – though earlier I also tried 3.23.2 on
> MacOS (the latter of which – Qgis for MacOS – I now believe to be a less
> refined and less finished variety of Qgis, similar version number or no).
>
> For my particular project at present (a map I'm preparing of Roman Britain),
> I'm adding rivers to the map – drawing data from a shapefile of the
> "waterways" (rivers, creeks, canals, ditches, etc.) of the island of Britain
> (containing something like 190,000 features!), distributed by the U.K.
> government.
>
> The procedure I've found most convenient at present for doing so (excepting
> the interference of the problem being discussed) is to copy the original
> shapefile to the name of the desired river, load it as a layer, open its 
> Attributes
> Table, turn on Editing, sort the table by name, select all features bearing 
> the
> right river name, then (after selecting the Select Features by Area or Single
> Click tool) scan through the segments and features of the intended river: 1)
> deselecting the segments of a different river possessing the same name (there
> are many such in Britain), 2) deselecting side segments which incorrectly bear
> your intended river's name (also a lot), 3) selecting incorrectly named
> segments (e.g., NULL) that if omitted would introduce gaps in the line of the
> river, 4) adding to the selection creeks possessing a different name, and so
> forth. Finally, invert the selection, delete all the features one didn't 
> select in the
> process above, then save.
>
> It all works well – until the eventual moment when one's pressed shift or
> control key momentarily fails to register, the entire laboriously selected 
> set of
> features clears back to just the last one touched – and I pull out even more 
> of
> my remaining hair.
>
> Nor does saving the layer every now and then in the middle of the process do
> any good – because what features are selected or not at that instant doesn't
> get remembered in the save file.
>
> This is the moment when it would be exceedingly nice if one could just pull
> down Edit > Select > Reselect Features and thereby get back to the last 
> previous
> selected set of features as they existed just prior to the last 
> keystroke/click
> entered.
>
> But that command appears to do nothing.
>
> (Thanks again for your response!)
>
> Best,
> Michael McNeil
>
>
> > On Nov 16, 2023, at 16:33, Andrea Giudiceandrea via QGIS-User  u...@lists.osgeo.org> wrote:
> >
> >
> >>
> >> Michael Edward McNeil memcneil02 at gmail.com Thu Nov 16 16:04:37 PST
> >> 2023
> >
> >> Why doesn't the Edit 

[Qgis-user] FW: Pansharpening Problem

[Richard McDonnell via QGIS-User]

Apologies,
I forgot to include the list in my response Grant, please see below.
Kind Regards,

Richard


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FRM Data Management

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From: Richard McDonnell
Sent: 16 November 2023 10:19
To: Grant Boxer 
Subject: RE: [Qgis-user] Pansharpening Problem

Hi Grant,
The NoDATA values, if not specified are calculated from the source rasters. For 
RGB imagery, this typically is either 0 or 255, unless you are using an alpha 
band.
You can though remove the NoDATA tag from the raster. I know of two of ways to 
do this.


1.   Use gdal_edit with the -unsetnodata, which will modify the existing 
dataset.

2.   Use gdal_translate to copy the raster but by using the -a_nodata and 
setting it to none, to remove the NoDATA tag

I would suggest if using the first one, that you make a backup of the raster, 
just in case.
I hope that helps!
Kind Regards,

Richard

From: QGIS-User 
mailto:qgis-user-boun...@lists.osgeo.org>> 
On Behalf Of Grant Boxer via QGIS-User
Sent: 16 November 2023 01:52
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Pansharpening Problem

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] Semi Automictic Classification Plugin- Reg

[Richard McDonnell via QGIS-User]

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 
HERE

Kind Regards,

Richard.


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FRM Data Management

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From: QGIS-User  On Behalf Of Chatke Rajesh 
Devrao via QGIS-User
Sent: 19 October 2023 10:41
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Semi Automictic Classification Plugin- Reg


Dear Sir/Madam ,



I'm Using the QGIS latest Stable version  3.28 , I'm trying to use the SCP 
plugin it got install but plugin is not appearing and showing the some python 
error, here i attached the screenshot of the error massage plz see the 
attachment and kindly do the needful.


Thank You
With Regards,
Rajesh Chatke
Young Professional-II (ICM-Division)
ICAR-National Academy of Agricultural Research Management (NAARM)
Rajendra Nagar
Hyderabad 500030
Mob: 9767729242
Off: 040-24581324
Alternate E-mail: chatke.raj...@gmail.com
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Re: [Qgis-user] SCP Plug-In Question

[Richard McDonnell via QGIS-User]

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 the format of the USGS signatures, nor have I any data to hand 
to test.
I hope this helps,

Kind Regards,

Richard.


——
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FRM Data Management

——
Oifig na nOibreacha Poiblí
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Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
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From: QGIS-User  On Behalf Of Molly D via 
QGIS-User
Sent: 05 October 2023 16:52
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] SCP Plug-In Question

Hi,

I was wondering if it is possible to import a file containing spectral 
signatures to classify an image using the SCP Plug-in? I have tried importing 
spectral signatures from the USGS library, but it seems like I still need to 
draw a polygon on my image to do any kind of classification. Is there a way I 
can carry out spectral signature classification without manually drawing 
polygons and creating that training data myself?

Thanks!
M
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Re: [Qgis-user] Combine raster bands in Graphical Modeller

[Richard McDonnell via QGIS-User]

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 
..


I hope that helps and hope the process works!
Kind Regards,

Richard


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From: box...@iinet.net.au 
Sent: 03 October 2023 13:05
To: Richard McDonnell 
Subject: RE: [Qgis-user] Combine raster bands in Graphical Modeller

Hi Richard,

Yes, I have thought about that by putting it in the gdal command, but not sure 
of the correct syntax.

Cheers Grant


From: Richard McDonnell 
mailto:richard.mcdonn...@opw.ie>>
Sent: Tuesday, October 3, 2023 7:15 PM
To: Grant Boxer mailto:box...@iinet.net.au>>
Cc: qgis-user@lists.osgeo.org
Subject: RE: [Qgis-user] Combine raster bands in Graphical Modeller

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


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FRM Data Management

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From: QGIS-User 
mailto:qgis-user-boun...@lists.osgeo.org>> 
On Behalf Of Grant Boxer via QGIS-User
Sent: 03 October 2023 04:48
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Combine raster bands in Graphical Modeller

I have a multiband raster and I need to add all the ten bands together to 
create a one band raster file. I can do this in the raster calculator manually 
but cannot seem to find a way to do this using the raster calculator in the 
graphical modeller. There is a max of 5 bands that can be operated on at any 
one time. Any suggestions?
Grant Boxer
Perth, WA

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Re: [Qgis-user] Combine raster bands in Graphical Modeller

[Richard McDonnell via QGIS-User]

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


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FRM Data Management

--
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From: QGIS-User  On Behalf Of Grant Boxer 
via QGIS-User
Sent: 03 October 2023 04:48
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Combine raster bands in Graphical Modeller

I have a multiband raster and I need to add all the ten bands together to 
create a one band raster file. I can do this in the raster calculator manually 
but cannot seem to find a way to do this using the raster calculator in the 
graphical modeller. There is a max of 5 bands that can be operated on at any 
one time. Any suggestions?
Grant Boxer
Perth, WA

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Re: [Qgis-user] opening .sid files in QGIS

[Richard McDonnell via QGIS-User]

Apologies Asia for calling you Jeremy!
I was looking at the wrong feed for your name.
Kind Regards,

Richard




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FRM Data Management

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FRM Data Management

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> -Original Message-
> From: QGIS-User  On Behalf Of Richard
> 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 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 you get to Select Packages
> 5)  In the search bar Type Mr and you should see the list drop to just Libs.
> When you expand on this you will see the GDAL drivers for MrSID
> 6)  It will say Skip, if you click on this it will change to the current 
> version.
> 7)  Click next and it will then go through the setup process. You will be
> required to accept the Licencing Agreement, but once finished you will be
> able to use MrSID format.
>
> I hope that helps.
> Kind 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
>
> ——
> 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/
>
>
>
> ——
> 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://www.opw.ie
>
> ——
> 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.opw.ie/en/disclaimer/
> > -Original Message-
> > From: QGIS-User  On Behalf Of Garth
> > Fletcher via QGIS-User
> > Sent: 26 September 2023 20:31
> > To: asiajmur...@gmail.com
> > Cc: qgis-user@lists.osgeo.org
> > Subject: Re: [Qgis-user] opening .sid files in QGIS
> >
> > I have routinely opened .SID color orthophoto files for several years
> > with QGIS running on a Mac.
> > Currently using QGIS 3.30 under Mac OS X 10.13; I started using QGIS
> > back in the 2.14 days, ~2016.
> >
> > I have a vague recollection of having to load a MrSID SDK, perhaps 4
> > or
> > 5 years ago.
> > Perhaps that installation has been persistent since I haven't had to
> > do anything MrSID related since as I updated QGIS.
> > If indeed a MrSID is needed, it can be found at
> > <https://www.extensis.com/support/developers>
> >
> > --
> > Garth Fletcher
> >
> > ___
> > QGIS-User mailing list
> > QGIS-User@lists.osgeo.org
> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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Re: [Qgis-user] opening .sid files in QGIS

[Richard McDonnell via QGIS-User]

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 you get to Select Packages
5)  In the search bar Type Mr and you should see the list drop to just Libs. 
When you expand on this you will see the GDAL drivers for MrSID
6)  It will say Skip, if you click on this it will change to the current 
version.
7)  Click next and it will then go through the setup process. You will be 
required to accept the Licencing Agreement, but once finished you will be able 
to use MrSID format.

I hope that helps.
Kind 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

——
To send me files larger than 30MB, please use the link below 
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Email Disclaimer: 
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——
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
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> -Original Message-
> From: QGIS-User  On Behalf Of Garth
> Fletcher via QGIS-User
> Sent: 26 September 2023 20:31
> To: asiajmur...@gmail.com
> Cc: qgis-user@lists.osgeo.org
> Subject: Re: [Qgis-user] opening .sid files in QGIS
>
> I have routinely opened .SID color orthophoto files for several years with
> QGIS running on a Mac.
> Currently using QGIS 3.30 under Mac OS X 10.13; I started using QGIS back in
> the 2.14 days, ~2016.
>
> I have a vague recollection of having to load a MrSID SDK, perhaps 4 or
> 5 years ago.
> Perhaps that installation has been persistent since I haven't had to do
> anything MrSID related since as I updated QGIS.
> If indeed a MrSID is needed, it can be found at
> 
>
> --
> Garth Fletcher
>
> ___
> QGIS-User mailing list
> QGIS-User@lists.osgeo.org
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Re: [Qgis-user] Does QGIS require units "m" for the projection coordinate variables in a netCDF/CF file?

[Richard McDonnell via QGIS-User]

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 get was 
EPSG:6931
If you look at the units there you can see meters as the UoM.
I hope that helps,

Richard.




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FRM Data Management

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From: QGIS-User  On Behalf Of Thomas 
Lavergne via QGIS-User
Sent: 15 September 2023 13:34
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Does QGIS require units "m" for the projection coordinate 
variables in a netCDF/CF file?

Dear QGIS community,

We recently released a number of sea-ice climate data records stored in 
netCDF/CF files.
An example file is 
here:

Our files use a polar equal area projection (EASE2) and the x / y axis values 
are given with units "km" (kilometers):

double xc(xc) ;
xc:axis = "X" ;
xc:units = "km" ;
xc:long_name = "x coordinate of projection (eastings)" ;
xc:standard_name = "projection_x_coordinate" ;
double yc(yc) ;
yc:axis = "Y" ;
yc:units = "km" ;
yc:long_name = "y coordinate of projection (northings)" ;
yc:standard_name = "projection_y_coordinate"

When opening these in QGIS, they are placed correctly on the map, but the 
message "Unkown CRS" appears in the lower-right corner.

By manipulating our files, we could get QGIS to recognize the correct CRS.

ncap2 -s 'xc=xc*1000f;yc=yc*1000f' infile.nc 
outfile.nc
ncatted -O -a units,xc,m,c,"m" outfile.nc
ncatted -O -a units,yc,m,c,"m" outfile.nc

The NCO commands above change the x / y axis variables to units "m" (meters).

The CF 
convention
 does not impose that x / y axis variables are given with unit meters, and 
shows several examples using units "km". But this is apparently an issue for 
QGIS.

Can someone please confirm that QGIS requires "meters" for these variables, and 
comment if this is a desired feature or if I should open a bug report at github?

All the best,
Thomas
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[Qgis-user] FW: Problem with Georeferences on AutoCAD version

[Richard McDonnell via QGIS-User]

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 
format is easier for 3rd party software to use. Usually when sending DWG I 
would use "AutoCAD 2000/LT2000 Drawing (*.dwg)" as my preferred output format 
and the same for DXF (AutoCAD 2000/LT2000 DXF (*.dxf))
Easiest solution is to go back to source of the CAD files and have them resave 
out to a pre-2018 version for you. Alternately there are a number of Free CAD 
software out there that can take in DWG, which should allow you to save it to 
an older version..though with post 2018 versions, they may have the same 
issues..
I hope this clarifies things a little.
Kind Regards,

Richard




--
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FRM Data Management

--
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From: QGIS-User 
mailto:qgis-user-boun...@lists.osgeo.org>> 
On Behalf Of Javier Jimenez via QGIS-User
Sent: 01 September 2023 13:36
To: qgis-develo...@lists.osgeo.org; 
qgis-community-t...@lists.osgeo.org;
 qgis-user@lists.osgeo.org
Subject: [Qgis-user] Problem with Georeferences on AutoCAD version

Good morning,
Using QGIS in version 3.28.9 and version 3.32.1 I have had the following 
problem.
When importing a .dwg file generated by AutoCAD, the application is not able to 
import the file in versions later than 2018.
How could I import a file from a more current version?
Knowing that most AutoCAD users use current versions with the latest tools, I 
think it would be very useful to be able to import files from any version of 
AutoCAD.

This error has been generated by the following steps:
1. Create a new Project
2. Import / Export
3.Import Layers from DWG/DXF
4.Drop-down window as shown in the attached image

-

Buenos días,
Utilizando QGIS en la versión 3.28.9 y la versión 3.32.1 he tenido el siguiente 
problema.
Al importar un archivo .dwg generado por AutoCAD, la aplicación, no es capaz de 
importar el archivo en versiones posteriores a la 2018.
¿Cómo podría importar un archivo de una versión más actual?
Sabiendo que la mayoría de los usuarios de AutoCAD utilizan versiones actuales 
con las herramientas más modernas, creo que sería muy útil poder importar 
archivos de cualquier versión de AutoCAD.

Este error se ha generado siguiendo los siguientes pasos:
1.   Crear un nuevo Proyecto
2.   Importar / Exportar
3.   Importar Capas desde  DWG/DXF
4.   Ventana desplegable que aparece en la imagen adjunta

Adjunto imagen del error que se ha generado.
[cid:image003.png@01D9DCDB.0DE54CA0]

Un saludo,
Javier Jiménez

[cid:image005.png@01D9DCDB.0DE54CA0]

Javier Jiménez
Departamento de Desarrollo

Tel +34 683 554 229
Email jjime...@proyectapv.com
Web www.proyectapv.com

[Título: LinkedIn - Descripción: image of LinkedIn 
icon]




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Re: [Qgis-user] Georeference DSM files in QGIS Using Georeferencer

[Richard McDonnell via QGIS-User]

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 
here.
 The one which looks best suited for Georeferencing data wich already has a CRS 
applied, would appear to me to be..

gdal_translate -co PROFILE=BASELINE -co TFW=YES dem.tif dem_clean.tif

It seems to reset the GeoTiff back to just a Tiff, from there you should be 
able to georeference it easy enough.
Hope that helps!
Kind Regards,

Richard




——
Richard McDonnell MSc GIS, FME Certified Professional
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From: QGIS-User  On Behalf Of Michael Dufty 
via QGIS-User
Sent: 28 July 2023 03:16
To: Mark C Quilter ; qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Georeference DSM files in QGIS Using Georeferencer

I had similar issues in 2021 trying to use the georeferencer on tiff files that 
already had a crs assigned.
I did not resolve it at the time, just found a workaround, I wonder if it is 
still the same issue.
Seemed like QGIS was picking up the control points in the image as spatial 
coordinates, then treating them as pixel coordinates (or vice versa).

Alexis RL on this list said a proposed fix was up, but I never tested it.


From: QGIS-User 
mailto:qgis-user-boun...@lists.osgeo.org>> 
On Behalf Of Mark C Quilter via QGIS-User
Sent: Friday, July 28, 2023 2:23 AM
To: qgis-user@lists.osgeo.org
Cc: Mark Quilter mailto:mquil...@utah.gov>>
Subject: [Qgis-user] Georeference DSM files in QGIS Using Georeferencer


I am trying to measure the amount of sediment captured in several analog beaver 
dams on a small wash in northern Utah.

We flew the site with a drone and collected images that provided us with an 
orthomosaic, point cloud, and DSM (digital surface model) of the wash.  Ground 
control points were put out and the images and elevation models came into QGIS 
accurately (no rectification was needed).  This flight was before the analog 
beaver dams were installed (2021).

We flew the same site last month and produced orthomosaic, point cloud, and 
DSM.  However, we were not able to put out ground control so we needed  to 
rectify the images in QGIS so they would align with the 20213 imagery and 
models.  We were able to align the orthomosaic using Georeferencer ( 3.28.2).  
We have not been able to rectify the DSM.

To attempt to rectify the DSM we used the same control points as used for the 
orthomosaic (the surface model was aligned with the orthomosaic).  This 
produces a file but its location was out of the mapping area and the elevation 
data was no longer correct.  We also used the 4 corners of the DSM for the 
control points in Georeferencer (these corners are the same corner extents as 
the rectified orthomosaic.  This also produced a geotiff somewhere on earth 
with no elevation data.

We also used the plugin Freehand Raster Georeferencer by using the 2 point 
method (1 point being the LL corner and the second point being the UR corner.  
The rectified orthomosaic that was produced the same time the DSM was made was 
used as the base map.  Again the produced file (png) was somewhere on earth but 
not in the correct location and the elevation data was corrupt.

I would appreciate and help with rectifying DEM and DSM files.

Thanks

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Re: [Qgis-user] draw polygon

[Richard McDonnell via QGIS-User]

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 polygons 2 and 3 shouldn’t be altered, as the Split feature tool will only 
alter the Selected/Highlighted Polygon 1

[cid:image001.png@01D9BEEB.9C9A7320].

Hope that helps.
Regards,

Richard



——
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FRM Data Management

——
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From: QGIS-User  On Behalf Of Prisma via 
QGIS-User
Sent: 24 July 2023 10:59
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] draw polygon

Hello,

I need to draw a polygon, the blue one indicated in the figure below:

[cid:image002.png@01D9BEEB.9C9A7320]

I tried with the split features toll but I received an error. Any solution?

Thank you.

Regards,

Salvatore


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Re: [Qgis-user] Uninstalling QGIS

[Richard McDonnell via QGIS-User]

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 Regards,

Richard





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FRM Data Management

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——
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FRM Data Management

——
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Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
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> -Original Message-
> From: QGIS-User  On Behalf Of Randal
> Hale via QGIS-User
> Sent: 13 June 2023 15:31
> To: qgis-user@lists.osgeo.org
> Subject: [Qgis-user] Uninstalling QGIS
>
> Not that I'm going to
>
> .but I was asked if there is an official "uninstall guide". A friend is 
> working
> through some issues and basically wants to remove every bit of QGIS
> (folders/registry) so it can be reinstalled. It's all in the name of trying 
> to fix
> some oddball problems on windows 10 and not reinstall windows 10.
>
> Randy
>
> --
> Randal Hale
> rjh...@northrivergeographic.com
> https://www.northrivergeographic.com
> 
> QGIS/PostGIS/Geoserver Support and Services
>
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Re: [Qgis-user] DXF Export symbolLayer

[Richard McDonnell via QGIS-User]

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 examples based on your data.

In this first example, I will assume you are just trying to output the Layer as 
a DXF with symbols and styling as you have them shown on the canvas, this can 
simply be done by...


1.   Selecting Project from the Menubar then Import/Export - Export Project 
to DXF

2.   In the next window set the Save As field set the Location you want 
your DXF along with giving it a name.

3.   Symbology Scale This will depend on what scales the DXF is being 
printed out at, I have set 250 for the example

4.   CRS, I have kept it the same as your Project

5.   Layer This is the Layers you want to export, in this case sqq_subset

6.   If you are only exporting only what's in Canvas view tick Export 
features intersecting the current map extent, otherwise untick this to export 
whole Layer

7.   The only other thing I would tick in Export Labels as MTEXT if you 
have labels you want in your outputs.

8.   Click OK


Now if you want a DXF with two layers, Grenzpunkt and Others? You will need to 
split your single Layer into multiple layers. For the purposes of this I will 
assume were going for the two you have styled.

I don't know why I can't add actual columns, only virtual only seems to be 
allowed

Ok, so first thing to remember is DXF is not a smart dataset, so we need to 
dumb down your data a little.
To do this, we need to split the dataset into two layers, one for Grenzpunkt 
and one for Others
So firstly we need to categorise all data into the Layers we want (Grenzpunkt 
and Others), to do this we do something similar to what we done before. We 
create a column let's call it "sgg_subset" and into this we can use the 
following formula

CASE WHEN  "TYP" = 20  THEN 'Grenzpunkt'
ELSE 'Others'
END

Next we use the Split vector layer tool to create however many layers we want, 
in our case two. We use our layers attribute as the Unique ID field, making 
sure the  Add prefix to filenames is ticked (what we called our column) or 
unticked, as you require. You can now specify the Output file type and the 
Output directory. You can now click Run

Once this is completed, load you're newly created Layers into the Project and 
style as required.
Now we can export to DXF using the tool in the first example. The difference 
being we want the ONLY newly created individual layers ticked in the Layer box

If you want to improve how the styling, symbology is output, you will need to 
work on the QGIS Style, modifying it to get the desired output in DXF.

Any of the steps above can be modified to suit the outputs you want.
I have attached a zip file with the updated project and the output DXF 
examples, I hope it helps.
Regards,

Richard








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Richard McDonnell MSc GIS, FME Certified Professional
FRM Data Management

--
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From: Simon Gröchenig 
Sent: 12 June 2023 08:08
To: Richard McDonnell 
Cc: qgis-user@lists.osgeo.org
Subject: AW: DXF Export symbolLayer

Hi Richard,

thank you for your support.

I have added a (virtual) attribute 'RefName' with a similar CASE WHEN 
statement. But I don't see how this should change the DXF-output.

Some information:

  *   I have a point layer that I want to export to a DXF-file using the 
native:dxfexport algorithm.
  *   This layer has a categorized renderer.
  *   For the DXF export, I also set a field ("sgg_code" is my case) to split 
the features into several DXF-layers.
  *   Now I also have a field "RefName".
  *   The RefName corresponds with the expression used for the categorized 
rendering.
  *   And the RefName does NOT match the field "sgg_code" used for the 
DXF-split.
  *   I want to use the RefName (or labels set in categorized renderer) values 
instead of symbolLayer0, symbolLayer1, ...
I have attached a simple project with the point layer.

Simon

Re: [Qgis-user] DXF Export symbolLayer

[Richard McDonnell via QGIS-User]

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' THEN 'SomeOtherStringB'
END

This should look at the "TEST" Attribute and where it has 'symbolLayer0' it 
will output 'SomeOtherStringA' and where "TEST" is 'symbolLayer1' it will 
output 'SomeOtherStringB'
When its complete you can delete any attributes you don't need
I hope that helps,

Regards,

Richard


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FRM Data Management

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From: QGIS-User  On Behalf Of Simon 
Gröchenig via QGIS-User
Sent: 09 June 2023 10:12
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] DXF Export symbolLayer


Hi all,



I am trying to configure a DXF export using the native:dxfexport algorithm and 
layer symbology.



Using the categorized rendering for a vector layer results in values 
"symbolLayer0", "symbolLayer1", ... in the dxf-file. In Autodesk Viewer these 
values are the "Name", ArcMap imports these as "RefName" attribute.



My question: how can I modify the values symbolLayer0, symbolLayer1, ... to 
another string? A third-party tool requires special values here.



Best regards
Simon



Vermessungskanzlei Neumayr
Simon Gröchenig - Geoinformation

[cid:image001.jpg@01D99ADA.4ADA9F90]

Albin Egger-Str. 10
9900 Lienz
Tel: +43 4852-68568-31
Email: groeche...@zt-gis.at
Web: http://www.zt-gis.at/

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Re: [Qgis-user] Technical specifications

[Richard McDonnell via QGIS-User]

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 also recommend the use of a good 
PCI/NVME drive for boot, operating system and software, but also a second Solid 
State drive for storage of data you are working on. It's best not to be 
processing over a network, if at all possible.
Two decent screens are a must and I agree that a good Mouse and Keyboard are 
almost always overlooked.
In relation to Operating System, Its personal preference. Both Linux and 
Windows are stable, with varying degrees of involvement.
If you go down the windows operating system route, I would advise using the 
OSGeo4W installer to install everything. It keeps everything working well in 
one environment, installing all dependencies. It even making running GDAL or 
Python commands from Command line easier as it has its own OsGeo4w Shell. 
Updating and installing additional tools and library's is also a breeze. BIG 
SHOUT OUT TO THE DEVS!!!
I hope that helps!!
Kind Regards,

Richard.





——
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FRM Data Management

——
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——
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
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> -Original Message-
> From: QGIS-User  On Behalf Of Greg
> Troxel via QGIS-User
> Sent: 02 June 2023 11:51
> To: Sébastien LAGARDE via QGIS-User 
> Cc: KEITA Mamady kobélé 
> Subject: Re: [Qgis-user] Technical specifications
>
> Sébastien LAGARDE via QGIS-User  writes:
>
> Keep in mind that I have not used QGIS in a super serious way, and haven't
> even tried to figure out how much resources it needs, other that on my
> desktop (a hand-me-down machine that was high end in 2014, with 24 GB
> RAM), it runs fine.
>
> There's a huge question not asked or answered, which is about operating
> system.  I personally would not even consider using Windows, but that's me
> :-)
>
> > GIS operator Workstation (standard use)
> >
> >   *   Intel i5 or higher (12th gen) or AMD equivalent
> >   *   16 Gb RAM
> >   *   512 Gb HD but only SSD or even better PCI / NVME drives
> >   *   Small dedicated graphic card (any entry level card with 2-4 Gb of
> dedicated memory)
> >   *   1 Gb network
>
> This seems reasonable, but:
>
>   Knowing how much disk one needs requires a plan of how the system is
>   going to to be used.  With most data in a database, the question would
>   be then how much imagery you will have locally.
>
>   In 2023, I can't recommend buying any computer for desktop use with
>   less than 32 GB of RAM.  Almost always, my computers have become
>   unusable due to low RAM, before anything else, usually after more than
>   10 years.  If it is easily possible to upgrade, and there's evidence
>   that running QGIS and other things at once (browser, mail client, ?)
>   really fits in 16 GB *without any need to page anything back in*, then
>   maybe that's ok.  But it strikes me as likely too little.  (If it's
>   not easily possible to upgrade, buying a 16 GB computer is just plain
>   unwise IMHO.)
>
> > GIS analyst Workstation (double up) :
> >
> >   *   Intel i7or higher (12th gen) or AMD equivalent
> >   *   32Gb RAM
> >   *   1 Tb HD but only SSD or even better PCI / NVME drives
> >   *   dedicated graphic card (4 Gb of dedicated memory)
> >   *   1 Gb network
>
> Again I might go higher in RAM.
>
> > And don’t forget to include in your quotations good interfaces
> > (screens = min of 2*24 “, good keyboard and High DPI mouse), we tend
> > to neglect them and use what comes was standard with orders but good
> > large screens and a comfortable mouse does change your long term
> > experience !!
>
> Great advice.  I'm running with one monitor now but this would be a big
> improvement.
>
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Re: [Qgis-user] Click to open layer

[Richard McDonnell via QGIS-User]

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. So for example..

You can set your "filepath" attribute to something like..  
someRootfolder/somesubfolders/ and your action text would be


1.   MACHINE1  
qgis.utils.iface.addRasterLayer('C:/somefilepath/[%filepath%][%filename%]','[%filename%]')

2.   MACHINE2  
qgis.utils.iface.addRasterLayer('E:/someOTHERfilepath/[%filepath%][%filename%]','[%filename%]')

As long as the attributes stay the same, as in the same Root and Subfolders, 
then the first path can be anything...
So for arguments sake...


1.   MACHINE1  
qgis.utils.iface.addRasterLayer('D:/00_DATA_VALIDATION/[%filepath%][%filename%]','[%filename%]')

2.   MACHINE2 
qgis.utils.iface.addRasterLayer('//some_network_host/localdrive/00_DATA_VALIDATION/[%filepath%][%filename%]','[%filename%]')

I hope that's helps.
Kind Regards,

Richard






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FRM Data Management

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From: box...@iinet.net.au 
Sent: 20 May 2023 00:29
To: Richard McDonnell 
Subject: RE: [Qgis-user] Click to open layer

Hi Richard,

Thanks for that. Can I use a project path that points to the project folder, 
something like  '.\' ? I use two different machines and so it would be good to 
be able to use the local address.

Cheers Grant


From: Richard McDonnell 
mailto:richard.mcdonn...@opw.ie>>
Sent: Friday, May 19, 2023 11:42 PM
To: box...@iinet.net.au
Cc: qgis-user@lists.osgeo.org
Subject: RE: [Qgis-user] Click to open layer

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 two attributes in your Polygon, a 
"filepath" and a "filename" attribute. In the fileparh is the Path to the 
folder containing the GeoTiff and the filename is the name of the file you are 
looking to load... so something like this...

[cid:image001.png@01D98C99.DC1C7E00]

This should then load any GeoTIFF into your Canvas.
Kind Regards,

Richard


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FRM Data Management

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From: QGIS-User 
mailto:qgis-user-boun...@lists.osgeo.org>> 
On Behalf Of Grant Boxer via QGIS-User
Sent: 19 May 2023 09:47
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Click to open layer

I am sure there is a simple way to do this but I would like to click on a 
polygon and get it to open a tiff file into my map canvas. Do I use an Action 
and an "open" command?
Regards Grant Boxer

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Re: [Qgis-user] Click to open layer

[Richard McDonnell via QGIS-User]

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 two attributes in your Polygon, a 
"filepath" and a "filename" attribute. In the fileparh is the Path to the 
folder containing the GeoTiff and the filename is the name of the file you are 
looking to load... so something like this...

[cid:image001.png@01D98A70.D05A4F50]

This should then load any GeoTIFF into your Canvas.
Kind Regards,

Richard


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From: QGIS-User  On Behalf Of Grant Boxer 
via QGIS-User
Sent: 19 May 2023 09:47
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Click to open layer

I am sure there is a simple way to do this but I would like to click on a 
polygon and get it to open a tiff file into my map canvas. Do I use an Action 
and an "open" command?
Regards Grant Boxer

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Re: [Qgis-user] How I solved my "Polygon" to "Mutipoligons" problem

[Richard McDonnell via QGIS-User]

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 can be no Multipart Geometries. To explain a little further, we don’t 
allow Multiple Geometries linked by a single row in a Table, each geometry has 
its own row.
I hope that clarifies things.
Kind Regards,

Richard.





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> -Original Message-
> From: QGIS-User  On Behalf Of Andrea
> Giudiceandrea via QGIS-User
> Sent: 10 May 2023 14:23
> To: qgis-user@lists.osgeo.org
> Cc: Andrea Giudiceandrea 
> Subject: Re: [Qgis-user] How I solved my "Polygon" to "Mutipoligons"
> problem
>
> > Riccardo riccardopani at hotmail.com
> > Wed May 10 01:10:00 PDT 2023
>
> > The problem was that the shape file I created, had the “multipoligon”
> property while in those of the standard delivery there was the simple
> “polygon” property .
> > Based on what you told me, this property cannot be changed in a shape file
> already created.
>
> Hi Riccardo,
> this make no sense to me.
> If with "shape file" you actually mean "ESRI Shapefile" (*.shp), then, as
> previously written, an ESRI Shapefile polygon layer is always a MultiPolygon
> layer which can always stores multi-part geometries. It is not possible to
> create an ESRI Shapefile polygon layer that can store only single-part
> geometries.
>
> Maybe with "shape file" do you mean a vector layer of a format other then
> "ESRI Shapefile"?
>
> Best regards.
>
> Andrea
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Re: [Qgis-user] [pyqgis] create new raster

[Richard McDonnell via QGIS-User]

Hi Andrea,
Please disregard my last email the formula is incorrect.
Apologies..

Richard


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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: [Qgis-user] [pyqgis] create new raster

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 can also be ran as a batch in QGIS or  built into a model if you 
are looking to batch it or it’s something that’s regularly done.
The output type is Float32, as you are using DTM, probably with decimal places 
a NoDATA value of -

Regards,

Richard



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From: QGIS-User 
mailto:qgis-user-boun...@lists.osgeo.org>> 
On Behalf Of andrea antonello via QGIS-User
Sent: 09 May 2023 07:28
To: qgis-user@lists.osgeo.org<mailto:qgis-user@lists.osgeo.org>
Subject: [Qgis-user] [pyqgis] create new raster

Hello,
I am trying to find out the best workflow to create a new raster.
As an example I take an existing elevation model raster and loop over it to set 
values between 1500 and 2000 to novalue and write the result to a new raster.

This is the only way I found to do so:

# create new raster with novalues between 1500 and 2000
dataType = dtmLayer.dataProvider().dataType(1)
crs = QgsCoordinateReferenceSystem('EPSG:3003')
params = {
'EXTENT': dtmLayer.extent(),
'TARGET_CRS': crs,
'PIXEL_SIZE': dtmLayer.rasterUnitsPerPixelX(),
'NUMBER': -.0,
# 'OUTPUT_TYPE': dataType,
'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT
}
newRaster = processing.run('qgis:createconstantrasterlayer', params)['OUTPUT']
newRasterLayer = QgsRasterLayer(newRaster, 'temp', 'gdal')
newRasterProvider = newRasterLayer.dataProvider()

block = QgsRasterBlock(dataType, cols, rows)

for row in range(rows):
for col in range(cols):
point = dtmLayer.dataProvider().transformCoordinates(QgsPoint(col, 
row), transformType)
   value, res = dtmLayer.dataProvider().sample(QgsPointXY(point.x(), 
point.y()), 1)

if res and value != -.0:
if value < 1000 or value > 2000:
block.setValue(row, col, value)

newRasterProvider.setEditable(True)
newRasterProvider.writeBlock(block, band=1)
newRasterProvider.setEditable(False)


This code has two main issues:
1. if I uncomment the line containing OUTPUT_TYPE, I am getting an error about 
the type passed. But I can't find the right type needed there, it should be the 
one taken from the original provider.
2. the resulting raster is scrambled as if there was a shift in the setting of 
the values. But the QgsRasterBlock seems to be built correctly (rows, cols) and 
the values set properly (col, row).
3. in the above example, the dtmLayer has an epsg 3033 crs and when loaded 
manually into QGIS, it is recognized. But when I read the layer's metadata crs 
with pyQGIS , it is not able

Re: [Qgis-user] [pyqgis] create new raster

[Richard McDonnell via QGIS-User]

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 can also be ran as a batch in QGIS or  built into a model if you 
are looking to batch it or it’s something that’s regularly done.
The output type is Float32, as you are using DTM, probably with decimal places 
a NoDATA value of -

Regards,

Richard



——
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FRM Data Management

——
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Office of Public Works

Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
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https://gov.ie/opw

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From: QGIS-User  On Behalf Of andrea 
antonello via QGIS-User
Sent: 09 May 2023 07:28
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] [pyqgis] create new raster

Hello,
I am trying to find out the best workflow to create a new raster.
As an example I take an existing elevation model raster and loop over it to set 
values between 1500 and 2000 to novalue and write the result to a new raster.

This is the only way I found to do so:

# create new raster with novalues between 1500 and 2000
dataType = dtmLayer.dataProvider().dataType(1)
crs = QgsCoordinateReferenceSystem('EPSG:3003')
params = {
'EXTENT': dtmLayer.extent(),
'TARGET_CRS': crs,
'PIXEL_SIZE': dtmLayer.rasterUnitsPerPixelX(),
'NUMBER': -.0,
# 'OUTPUT_TYPE': dataType,
'OUTPUT': QgsProcessing.TEMPORARY_OUTPUT
}
newRaster = processing.run('qgis:createconstantrasterlayer', params)['OUTPUT']
newRasterLayer = QgsRasterLayer(newRaster, 'temp', 'gdal')
newRasterProvider = newRasterLayer.dataProvider()

block = QgsRasterBlock(dataType, cols, rows)

for row in range(rows):
for col in range(cols):
point = dtmLayer.dataProvider().transformCoordinates(QgsPoint(col, 
row), transformType)
   value, res = dtmLayer.dataProvider().sample(QgsPointXY(point.x(), 
point.y()), 1)

if res and value != -.0:
if value < 1000 or value > 2000:
block.setValue(row, col, value)

newRasterProvider.setEditable(True)
newRasterProvider.writeBlock(block, band=1)
newRasterProvider.setEditable(False)


This code has two main issues:
1. if I uncomment the line containing OUTPUT_TYPE, I am getting an error about 
the type passed. But I can't find the right type needed there, it should be the 
one taken from the original provider.
2. the resulting raster is scrambled as if there was a shift in the setting of 
the values. But the QgsRasterBlock seems to be built correctly (rows, cols) and 
the values set properly (col, row).
3. in the above example, the dtmLayer has an epsg 3033 crs and when loaded 
manually into QGIS, it is recognized. But when I read the layer's metadata crs 
with pyQGIS , it is not able to read it and tells me it is invalid.

Has anyone a hint about what I am doing wrong?

Thanks,
Andrea


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Re: [Qgis-user] Autogeneration id codes

[Richard McDonnell via QGIS-User]

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.



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FRM Data Management

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From: QGIS-User  On Behalf Of Riccardo via 
QGIS-User
Sent: 02 May 2023 16:28
To: Riccardo via QGIS-User 
Subject: [Qgis-user] Autogeneration id codes


Good morning to all,



first I would like to thank Bernhard Ströbl, Richard McDonnell, Andrea 
Giudiceandrea and Bernd Vogelgesang for suggestions related to some of my 
previous posts.



Now I have another problem.



I have some tables already created that have a column with autogeneration id 
codes.



>From self-generation I often don't get codes that start from 1 onwards but 
>start with other numbers.



I made some tests and I noticed that if I create a table and add 10 lines the 
autogeneration creates id codes from 1 to 10. If I delete these lines to empty 
the table when I create a new line Qgis autogenerates that with the code 11, it 
seems that Qgis keeps in memory the number/id code of the created elements, and 
keep the numbering as a fixed counter.



How can I impose a autogeneration of id codes starting from 1?



Many many thanks!



Best Regards.



Riccardo.

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Re: [Qgis-user] Shape file - Change "Polygon" to "Multipolygon"

[Richard McDonnell via QGIS-User]

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





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From: QGIS-User  On Behalf Of Riccardo via 
QGIS-User
Sent: 27 April 2023 11:07
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Shape file - Change "Polygon" to "Multipolygon"

Good morning to all,



I'm here again because I need another hint.



I have shape file already created for a standard delivery.



The geometry type of this shape file is "Polygon" and I have to change it into 
"Multipolygon".



Is it possible? And how can I change this property in a shape file already 
created without creating a new one?



Many many thanks!



Best Regards.



Riccardo.

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Re: [Qgis-user] Opening GEOTIFF file in QGIS support request

[Richard McDonnell via QGIS-User]

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 at some of their 
documentation. The data appears to be provided at a resolution of 250m (you can 
verify this in the properties) which is why, when zoomed in it appears 
pixelated. You will need to style it to make it look similar to how it's 
displayed online.
Also note, that on the website the data stops being displayed beyond a certain 
zoom level, this is to prevent issues like that you are experiencing.
I hope that clarifies things.
Regard's,

Richard




——
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FRM Data Management

——
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Sráid Jonathan Swift, Baile Átha Troim, Co na Mí, C15 NX36
Jonathan Swift Street, Trim, Co Meath, C15 NX36
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https://gov.ie/opw

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FRM Data Management

——
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> -Original Message-
> From: QGIS-User  On Behalf Of Richard
> Duivenvoorde via QGIS-User
> Sent: 27 April 2023 08:51
> To: ginol...@aol.com; Qgis-user@lists.osgeo.org
> Subject: Re: [Qgis-user] Opening GEOTIFF file in QGIS support request
>
> Hi Gino (please also keep the mailing list into the loop :-) ),
>
> What I see in your screenshot looks fine?
> I see you loaded a project in EPSG:4326 (lower right corner), and you data is
> apparently also fine, as I see coordinates 32/-116 (northern Mexico, or
> southern California?).
> This is not what you supposed to see? Raster data (unlike aerials etc) are
> squares, with one or more data value's for every square. Which historically is
> shown in a white to black styling (as you can see).
> You can put the OpenStreetMap beneath it, to have more reference (and an
> idea about the size/precision of your data)?
>
> About ogrinfo.. sorry I meant gdalinfo this is a commandline too (also in the
> QGIS install of Windows), which shows information about gis-data (gdalinfo
> for rasters, ogrinfo for vector)..
>
> Or am I missing your point?
> Can you share you download url from the Wind Atlas? (I see they have a lot
> of types of data). And as asked: what were you hoping to see?
>
> Regards,
>
> Richard Duivenvoorde
>
> On 4/26/23 21:31, ginol...@aol.com wrote:
> > Hi Richard,
> > Thank you for your reply. It looks like I’m actually able to open the file;
> however, I’m not seeing any GIS-data. Yes, it’s a GEOTIFF file. There is 
> annual
> wind energy production sample test data in the file but after opening it in
> QGIS what I see is just the screenshot below. Could this be due to an error in
> creating the file?  For “output of ‘ogrinfo” do you mean the file name? It’s
> “gwa3_hh100m_tl10_FLH_m0_582qxe1h.tif”. This is a file download from
> Global Wind Atlas.
> > Screen Shot 2023-04-26 at 12.03.55 PM.png
> >
> > Still not quite sure what I’m doing wrong :/ Kind regards, Gino
> >
> > -Original Message-
> > From: Richard Duivenvoorde via QGIS-User 
> > To: qgis-user@lists.osgeo.org
> > Cc: Qgis-user@lists.osgeo.org 
> > Sent: Tue, Apr 25, 2023 7:44 pm
> > Subject: Re: [Qgis-user] Opening GEOTIFF file in QGIS support request
> >
> > Hi GIno,
> >
> > QGIS should 'just show/open/ geotiff's fine.
> >
> > Can you open the geotiff in another viewer?
> > If not, or uncertain, are you sure it is a GEO-tiff (that is it contains 
> > the spatial
> info?) and not a 'normal tiff'?
> > If so: can you provide the output of 'ogrinfo ? This should show
> you info about the CRS/bbos/scale etc...
> >
> > Is the CRS (Coordinate Projection System / 'projection') of your tiff set to
> the right value (comparted to your other layers or project crs)?
> >
> > Regards,
> >
> > Richard Duienvoorde
> >
> > On 4/25/23 21:53, Gino via QGIS-User wrote:
> >  > Hello,
> >  > Good afternoon. Just wanted to send an email to request advice on
> opening a GEOTIFF file in QGIS. I'm trying to open a .tif file with QGIS;
> however, unable to view the data and not sure why. Please let me know
> best way to view this file type in QGIS.
> >  > Thank you,
> >  > Gino
> >  >
> >  > ___
> >  > QGIS-User mailing list

Re: [Qgis-user] Opening GEOTIFF file in QGIS support request

[Richard McDonnell via QGIS-User]

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 appearing in the Layer Panel?
3)Have you tried Dragging and dropping the Raster onto the Map Canvas?
4) As have a look at the Layer Properties, under Information. Look to see the 
rasters CRS, if its correct. Sometimes, the CRS isn't imbedded, resulting in it 
being displayed incorrectly.

If you, as Richard said could share any information about the raster with us, 
we could be of more help. As it is we have little to go on.
Kind Regards,

Richard






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> -Original Message-
> From: QGIS-User  On Behalf Of Richard
> Duivenvoorde via QGIS-User
> Sent: 26 April 2023 03:45
> To: qgis-user@lists.osgeo.org
> Cc: Qgis-user@lists.osgeo.org
> Subject: Re: [Qgis-user] Opening GEOTIFF file in QGIS support request
>
> Hi GIno,
>
> QGIS should 'just show/open/ geotiff's fine.
>
> Can you open the geotiff in another viewer?
> If not, or uncertain, are you sure it is a GEO-tiff (that is it contains the 
> spatial
> info?) and not a 'normal tiff'?
> If so: can you provide the output of 'ogrinfo ? This should show
> you info about the CRS/bbos/scale etc...
>
> Is the CRS (Coordinate Projection System / 'projection') of your tiff set to 
> the
> right value (comparted to your other layers or project crs)?
>
> Regards,
>
> Richard Duienvoorde
>
> On 4/25/23 21:53, Gino via QGIS-User wrote:
> > Hello,
> > Good afternoon. Just wanted to send an email to request advice on
> opening a GEOTIFF file in QGIS. I'm trying to open a .tif file with QGIS;
> however, unable to view the data and not sure why. Please let me know
> best way to view this file type in QGIS.
> > Thank you,
> > Gino
> >
> > ___
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> > QGIS-User@lists.osgeo.org
> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
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Re: [Qgis-user] Issue with displaying all rows in the attribute table in QGIS

[Richard McDonnell via QGIS-User]

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




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> -Original Message-
> From: QGIS-User  On Behalf Of Patrick
> Dunford via QGIS-User
> Sent: 29 March 2023 10:16
> To: qgis-user@lists.osgeo.org
> Subject: Re: [Qgis-user] Issue with displaying all rows in the attribute 
> table in
> QGIS
>
> What kind of layer are you accessing? I never see this issue on the layers I
> use.
>
> On 29/03/23 22:01, Pinkal Sanoria via QGIS-User wrote:
> > Hi Team,
> > I am writing to report an issue with QGIS that I have encountered
> > recently. Specifically, I have noticed that when I open the attribute
> > table for a layer in QGIS, it only displays a maximum of 99 rows. This
> > is problematic for me as I often work with layers that have more than
> > 99 features.
> >
> > Name Pinkal,
> > Hanoi
> > Thanks
> >
> > ___
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[Qgis-user] Geometry Error Detection

[Richard McDonnell via QGIS-User]

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" sharing a node with the external 
geometry (at the edge, see image below). What I was hoping for was that we 
could show these same errors in QGIS.

[cid:image001.png@01D960A2.4CD1B300]


I've used the following QGIS tools for validation of geometries with varying 
degrees of success, node directly flagging the issue detected.

Check Geometries Plugin:Flags error in Geometry Type, but gives 
little by way of explination..

Topology Checker:   Flags no errors

Check ValidityFlags no errors, with either 
QGIS or GEOS


Is there a way to check geometries, a tool, python, and another application, 
which can validate geometries? Or a series of tools which strung together in 
Model Builder could flag the issues?
Regards and thanks in advance,

Richard.







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Re: [Qgis-user] Problems with transformation including height values

[Richard McDonnell via QGIS-User]

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, then carry out the Vertical Transformation. This can be done in 
command line, if you are on windows, the best option is to use the OSGeo4w 
Shell, as all the needed environmental settings are applied.
I hope the above helps.

Maybe there is an opportunity to have QGIS preform Vertical translations, even 
if these are a separate step? It’s something that would be useful for both 
Raster and Vector Data.
Regards,

Richard




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From: QGIS-User  On Behalf Of Nyall Dawson 
via QGIS-User
Sent: 21 March 2023 10:14
To: Bo Victor Thomsen 
Cc: qgis-user 
Subject: Re: [Qgis-user] Problems with transformation including height values


On Tue, 21 Mar 2023, 8:06 pm Bo Victor Thomsen via QGIS-User, 
mailto:qgis-user@lists.osgeo.org>> wrote:

Hi list -

I have a problem with transforming a csv file containing x,y and z values from 
EPSG:4326 to EPSG:7416, i.e I want to transform the height value from LongLat/ 
WGS84 ellipsoid height to UTM32/Etrs89 with vertical reference DVR90.

The file look like this:

== data.csv, EPSG:4326 id: col1, x: col3, y: col2, z: col4 ==
a;55.0;12.0;42.0
b;55.05;12.0;43.0
c;55.10;12.0;44.0
d;55.15;12.0;45.0
e;55.20;12.0;46.0
===

Step 1: I import the file into QGIS using the Data Source Manager --> 
"Delimited Text" and define the projection to be EPSG:4326 and to include z 
values. This works and the points are shown on my map where I expect them to be 
(Somewhere in the middle of Zealand, Denmark)

Step 2: I export the layer as a geojson file using "Export" --> "Save features 
as.." from the layer manager and choose EPSG:7416 (UTM32/ETRS89 with DVR90 as 
vertical reference. And to include z-values

The resulting file looks like this:

== data.geojson, EPSG:7416 ==
{
"type": "FeatureCollection",
"name": "data",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:EPSG::4979" } 
},
"features": [
{ "type": "Feature", "properties": { "field_1": "a", "field_2": 55.0, 
"field_3": 12.0, "field_4": 42.0 }, "geometry": { "type": "Point", 
"coordinates": [ 12.0, 55.0, 42.0 ] } },
{ "type": "Feature", "properties": { "field_1": "b", "field_2": 55.05, 
"field_3": 12.0, "field_4": 43.0 }, "geometry": { "type": "Point", 
"coordinates": [ 12.0, 55.05, 43.0 ] } },
{ "type": "Feature", "properties": { "field_1": "c", "field_2": 55.1, 
"field_3": 12.0, "field_4": 44.0 }, "geometry": { "type": "Point", 
"coordinates": [ 12.0, 55.1, 44.0 ] } },
{ "type": "Feature", "properties": { "field_1": "d", "field_2": 55.15, 
"field_3": 12.0, "field_4": 45.0 }, "geometry": { "type": "Point", 
"coordinates": [ 12.0, 55.15, 45.0 ] } },
{ "type": "Feature", "properties": { "field_1": "e", "field_2": 55.2, 
"field_3": 12.0, "field_4": 46.0 }, "geometry": { "type": "Point", 
"coordinates": [ 12.0, 55.2, 46.0 ] } }
]
}
===

The new file is shown in my map exactly on top of the original point layer, 
meaning the horizontal projection is accurate. However, my z coordinates are 
not reprojected to the new vertical reference. All the z-values are exactly the 
same as the values in the .csv - file.

After some digging through Google and other places, I discover that EPSG:4326 
doesn't have a z component. Surprise ! You have to use EPSG:4979, which is the 
same as EPSG:4326 with ellipsoid height.

But, after repeating step 1, but using EPSG:4979 as CRS during import, and 
subsequently repeating step 2, I get the exact same result: No transformation 
of height values.

So, what is not working ? Am I doing something wrong ?? Or is QGIS incapable of 
transforming z values ???

The second -- qgis currently doesn't handle vertical crs at all. My 
recommendation is to use gdal utilities to do a transform respecting vertical 
datums.

Nyall



--

Med venlig hilsen / Best 

Re: [Qgis-user] Looking for application/server etc

[Richard McDonnell via QGIS-User]

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



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From: QGIS-User  On Behalf Of Dennis Burgess 
via QGIS-User
Sent: 12 January 2023 15:43
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Looking for application/server etc

Looking for something that can take a HUGE, say a 50-75 meg mutli-polygon 
(multi-state etc.), that has detail level down to 1meter, then parse it and 
display it within 1meg on top of mapping systems in a web browser ?  Options?  
Not to mention, we have a few thousand of these so we need to be able to call 
the mapping for any one of them.   We also need it to simplify it i.e. maybe 
deliver a max a 1 meg to the customer..  if they zoom out we want to make it 
simpler to deliver something to the customer..  I'm sure there is a way of 
doing this..

I'm sure there is an application, server, something that can do this 
automatically..



Dennis Burgess
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Re: [Qgis-user] Colouring Geological Maps

[Richard McDonnell via QGIS-User]

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" = 'Sedimentary ' THEN '#03fc56'
  WHEN "class" = 'Igneous rocks' THEN '#7303fc'
  WHEN "class" = 'Metamorphic' THEN '#fc03e7'
  ELSE '#fc0303'
END

This will then assign a colour to each feature, which you can assign using the
This can be done for a lot of the styling options as I mentioned before.

As I said below, and as you mentioned in your message, this won't be reflected 
in the Legend, only in the Map. The above probably isn't the solution you are 
looking for.

Another suggestion is to look into creating a set of Standard Styles stored 
centrally. When you load a Layer into Qgis you can load these styles as 
required, which will apply the rules you previously set.

You can also create default styles for a particular layer and every time you 
load the layer into a Project the style is automatically loaded with the layer. 
You can do this from in the Layer Properties and going down to the Style Button 
selecting Save as default

Kind Regards,

Richard


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From: box...@iinet.net.au 
Sent: 12 December 2022 10:24
To: Richard McDonnell 
Subject: RE: [Qgis-user] Colouring Geological Maps

Hi Richard,

I can colourise the polygons using the color(rgb) algorithm but this does not 
flow back to the layers panel or the map layout legend.

What do you mean "storing..as a set of attribute values"?

Thanks for your assistance,
Cheers Grant


From: Richard McDonnell 
mailto:richard.mcdonn...@opw.ie>>
Sent: Monday, 12 December 2022 6:18 PM
To: box...@iinet.net.au; 
qgis-user@lists.osgeo.org
Subject: RE: [Qgis-user] Colouring Geological Maps

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 your data and then 
have a single default style, which has all the Styling Variables set to use the 
new attribution.
The only issue with this is that you won't generate a legend...
Kind Regards,

Richard


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FRM Data Management

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From: QGIS-User 
mailto:qgis-user-boun...@lists.osgeo.org>> 
On Behalf Of Grant Boxer via QGIS-User
Sent: 11 December 2022 08:48
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Colouring Geological Maps

I am trying to find an easier way of colouring a geological map. The only way I 
can find to colourise the polygons in both the map window and layers panel - 
and hence the displayed legend - is to use the rule-based rendering option. 
Each rule has to be manually styled.

Is there a way to get QGIS to interrogate a text file for styling information? 
I can't seem to find one anywhere in the algorithms. Aiming to use this in a 
graphical modeller to 

Re: [Qgis-user] Colouring Geological Maps

[Richard McDonnell via QGIS-User]

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 your data and then 
have a single default style, which has all the Styling Variables set to use the 
new attribution.
The only issue with this is that you won't generate a legend...
Kind Regards,

Richard


--
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FRM Data Management

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From: QGIS-User  On Behalf Of Grant Boxer 
via QGIS-User
Sent: 11 December 2022 08:48
To: qgis-user@lists.osgeo.org
Subject: [Qgis-user] Colouring Geological Maps

I am trying to find an easier way of colouring a geological map. The only way I 
can find to colourise the polygons in both the map window and layers panel - 
and hence the displayed legend - is to use the rule-based rendering option. 
Each rule has to be manually styled.

Is there a way to get QGIS to interrogate a text file for styling information? 
I can't seem to find one anywhere in the algorithms. Aiming to use this in a 
graphical modeller to automate colourising geological maps. I can use a fixed 
qml file but that has to be done for each individual map unless you have a wide 
range of set styles.

Cheers Grant, Perth WA

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Re: [Qgis-user] Problem Noticed with QGIS

[Richard McDonnell via Qgis-user]

Andrea,
Thank you for the clarification and the work around!
Regards,

Richard



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FRM Data Management

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From: Qgis-user  On Behalf Of Andrea 
Giudiceandrea via Qgis-user
Sent: 29 November 2022 16:14
To: qgis-user@lists.osgeo.org
Subject: Re: [Qgis-user] Problem Noticed with QGIS

Richard McDonnell richard.mcdonnell at 
opw.ie
Tue Nov 29 07:17:48 PST 2022


1.   If I use the option [Create temporary Layer] it produces a Singlepart 
Geometry as Expected, If I save the output to a File, the resultant geometry is 
stated as Polygon (MultiPolygon) Its the same for Linestrings also.

Hi Richard,
as explained (also by me) in the linked issue report [1], the line (PolyLine) 
and polygon (Polygon) ESRI Shapefile layer types are actually multi-part layer 
types which can store both multi-part geometries with only one part and 
multi-part geometries with more than one part.
Only the point layer type has two different ESRI Shapefile layer types: the 
ESRI Shapefile Point type (which is a single-part type and can store only 
single-part geometries) and the ESRI Shapefile MultiPoint type (which is a 
multi-part type and can store multi-part geometries both with only one part and 
with more than one part).

Please see the ESRI Shapefile Technical Description [2].

If you want to check that a line (PolyLine) and polygon (Polygon) ESRI 
Shapefile layer imported in QGIS contains features with only 1 part, you need 
to check the number of part for each feature, for example using the 
num_geometries function [3] in the field calculator.

Best regards.

Andrea Giudiceandrea

[1] https://github.com/qgis/QGIS/issues/50720
[2] https://www.esri.com/Library/Whitepapers/Pdfs/Shapefile.pdf/
[3] 
https://docs.qgis.org/3.22/en/docs/user_manual/expressions/functions_list.html#num-geometries
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[Qgis-user] Problem Noticed with QGIS

[Richard McDonnell via Qgis-user]

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 version


2.4.3


SpatiaLite version


5.0.1


QWT version


6.1.6


QScintilla2 version


2.13.1


OS version


Windows 10







I have the following issue.

As part of our Data verification Processes, we require that our data arrive as 
Singlepart Geometries.
We run the Check Geometries Tool and it flags the data as Geometry Type Error. 
So I run the Multipart to Singlepart tool andwell that's where the problem 
is...

Its two parts...


1.   If I use the option [Create temporary Layer] it produces a Singlepart 
Geometry as Expected, If I save the output to a File, the resultant geometry is 
stated as Polygon (MultiPolygon) Its the same for Linestrings also.



2.   When the New "corrected" layer is passed through the Check Geometries 
Tool, it flags it as a Geometry Type Error, even though I know its fixed, as I 
can validate it in an external tool.

Now I did find this.. https://github.com/qgis/QGIS/issues/50720 which flags the 
same issues, but states that its down to the Shapefile Specification.

Is there a work around for this??

Regards,

Richard



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FRM Data Management

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Re: [Qgis-user] large DEM not loading tiles correctly

[Richard McDonnell via Qgis-user]

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 -

b.   Advanced Parameters

   i.  
NUM_THREADS = ALL_CPUS

 ii.  BIGTIFF = 
YES

   iii.  TILED = YES

   iv.  COMPRESS = 
LZW

c.   Data Type to Float32

3.   You can then also use Pyramids for your Maximum zoom levels, I 
recommend external, as they can be deleted if you want to change them.

I hope that goes some wat to helping.
Kind Regards,

Richard.



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FRM Data Management

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From: Qgis-user  On Behalf Of Michael.Dodd 
via Qgis-user
Sent: 28 September 2022 12:32
To: 'qgis-user@lists.osgeo.org' 
Subject: [Qgis-user] large DEM not loading tiles correctly

I am trying to put together the 50m uk DEM e.g. 
https://www.data.gov.uk/dataset/835cf20a-8feb-4394-8b30-dcfe840ac13d/os-terrain-50-dtm
 but it often does not work.  The data are supplied as thousands of small tiles 
that takes ages to unpack and put into a folder to get into qgis, however when 
you try to load the tiles some work and others don’t and even the ones that do 
work and display fine sometimes don’t merge to form large tiles and sometimes 
will form virtual rasters but not merged files.  Basically it is a mess.  I 
suspect others have done this successfully so any suggestions?
It is particularly odd that some of the tiles will merge and others won’t and 
that some won’t display if you ask it to load hundreds at a time but if you 
just add them in a few at a time then they will load and display (in addition 
to the hundreds already loaded). This suggests various bugs assuming the 
original data are not in a whole variety of slightly different formats (should 
all be .asc)

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Re: [Qgis-user] Raster

[Richard McDonnell via Qgis-user]

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 you to use the correct 
transparency value.

Hope this helps,

Richard



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FRM Data Management

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From: Qgis-user  On Behalf Of Lazanu 
Ciprian-Catalin via Qgis-user
Sent: 24 May 2022 11:53
To: Uwe Fischer via Qgis-user ; Uwe Fischer via 
Qgis-user 
Subject: [Qgis-user] Raster

Hello,
I georeferenced three maps ... all good, quite easy by using points from map 
canvas. When my map was ready it has a black border (image 1). This is solved 
by ~Custom transparency options~, and a black border disappears. But this 
solution is just temporarily, because if I close and reopen ... that raster has 
again a black border. I want to merge the three maps in one, but it does with a 
black border between maps.
A solution to this annoying problem?

Thank you
https://drive.google.com/drive/folders/1qM1_TeFUng9-xyRXRQCuMrEMwxFeJV7n?usp=sharing
 images
Meet Google Drive – One place for all your 
files
Google Drive is a free way to keep your files backed up and easy to reach from 
any phone, tablet, or computer. Start with 15GB of Google storage – free.
drive.google.com


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Re: [Qgis-user] Problem merging 30-m SRTM tiles in QGIS 3.24.3 for MacOS 10.14.6

[Richard McDonnell via Qgis-user]

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 gdal_translate (Raster ==> 
Conversion ==> Translate)
I hope this helps,
Kind Regards,

Richard


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From: Qgis-user  On Behalf Of Wouter Impens 
via Qgis-user
Sent: 20 May 2022 11:04
To: qgis-user 
Subject: Re: [Qgis-user] Problem merging 30-m SRTM tiles in QGIS 3.24.3 for 
MacOS 10.14.6

Hi Walter,

I'm having good results using the 'r.patch' tool from GRASS for merging rasters.

Hope this helps

Greetings
Wouter

Op do 19 mei 2022 om 23:31 schreef Walter Alvarez via Qgis-user 
mailto:qgis-user@lists.osgeo.org>>:

I’m trying to merge either two or twelve 30-m SRTM tiles using QGIS 3.14.3.  In 
either case (2 or 12) I am stopped by the following problem:

Using Raster > Miscellaneous > Merge…

I get the “Merge" window.   I try to use Input layers > Elements selected > “…"

That takes me to the "Multiple Selection" window, showing the 2 or 12 files I 
want to merge (filenames:   nXXeXXX_1arc_v3 [EPSG:4326]).

After selecting all the files, when I click “OK”   the "Multiple Selection 
Window” and the “Merge” window both disappear, and I cannot figure out what to 
do next, or do differently.

I can’t figure out how to get past this problem and merge my tiles.

Thanks for any help you can offer!

Walter

__


Walter Alvarez
Professor of the Graduate School
Department of Earth and Planetary Science
University of California Berkeley


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