All Questions
42,192 questions
0
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7
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How to reduce load on calculations in pyQgis
I am trying to calculate the length of a network with creating length field and giving it expression of '$length' i have approximately 3000 features in layer i tried two ways
By giving default ...
- 13
2
votes
1
answer
21
views
Enabling "Iterate over feature" in QGIS Graphical Modeler
There is a function in the QGIS standalone processing tools that I cannot find in the Graphical Modeler: the iterator over features.
Here is what I see in the "standalone tool" (i.e. the ...
- 101
1
vote
1
answer
28
views
Why simultaneous reprojecting enables when exporting raster in QGIS?
At QGIS 3.34.13 I have an .sdat (Saga) raster file, single-band, 8-bit unsigned integer, pixel size (meters) 30, -30, CRS ESRI:102039 - USA_Contiguous_Albers_Equal_Area_Conic_USGS_version. The data ...
- 8,366
0
votes
0
answers
29
views
Unifying cell size and extent of raster layers in QGIS
In ArcGIS Pro, when using many analysis tools that deal with or generate raster layers, you can set the cell size and extent to exactly match another layer. This allows for map algebra to be done ...
- 345
0
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0
answers
21
views
Balloon Callouts are drawn under other layer's labels
I'm having the same problem with that DMS2 wrote in Callout lines drawn under other layer's labels.
The first screenshot is "without the layer with the label using a callout”. (The layer with the ...
- 1
0
votes
1
answer
22
views
Scale all features proportionally within a layer
I'm new to QGIS, please bear with me. I've imported several layers from a fantasy map generator, all at the same scale / CRS. But the final one, appears to be smaller in extent - the proportions are ...
- 11
-1
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0
answers
29
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Step-by-step guide to analyze solar potential in QGIS [closed]
I am looking for a detailed, step-by-step guide on how to analyze the solar potential of urban rooftops using QGIS. The aim is to calculate solar insolation for individual rooftops and assess the ...
- 1
0
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0
answers
19
views
QGIS GDAL Clip by Mask not working
I am trying to clip a raster by a shape mask in QGIS using GDAL but I keep getting the error
Process gdalwarp failed to start. Either gdalwarp is missing, or you may have insufficient permissions to ...
1
vote
0
answers
20
views
Fixing clipped geometries at WMTS tile boundaries in QGIS Server
I'm experiencing an issue with QGIS Server's WMTS service where geometries are clipped or misaligned at tile boundaries, creating visible gaps between tiles. While I know MapProxy and MapCache can ...
- 456
0
votes
0
answers
21
views
Why does layer.materialize() fail to copy features in gpkg files containing json data?
After making this post: layer.materialize() function not copying all features within layer
I ran another multi-part test to determine why layer.materialize() does not copy all features within ...
- 33
2
votes
0
answers
29
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Connecting QGIS/QField to external object storage buckets (Google cloud storage) for sending images directly to the bucket
I am struggling to understand how to authenticate QGIS to connect with Google Cloud storage when configuring the attachment widget.
I have exported a JSON key for a service account, but not sure which ...
- 21
0
votes
0
answers
24
views
QGIS Snapping not working for move and copy feature
I use the Move & copy feature from the advanced digitized panel and would like to stitch two lines together, which are in the same layer. Regrettably, the snapping tool seems to not work at all.
...
- 3,791
2
votes
1
answer
61
views
Removing unnecessary layers in overview map in QGIS
How can I remove unnecessary layers in the overview map?
For example in the highlighted view, BMs must be removed.
- 21
4
votes
2
answers
218
views
Creating "horseshoe" polylines from lines in QGIS
I need to generate “horseshoe”/U lines that can be imported into another program for hydrological adjustments.
I have the correct centerlines, but I can’t quite figure out how to generate these lines ...
- 537
0
votes
1
answer
17
views
Report - Group Field Section: Dynamic Filtering of Geopoints
Situation: I am working on a report that uses a geopoint layer. The underlying table has columns for id, cat_name, and points in the format point Z (...). Each cat_name has multiple points (rows of ...
- 1
1
vote
1
answer
29
views
Using "Symmetrical difference" for multiple layers at once in QGIS
I have four different layers (Parks, Forest, Sports ground, Nothing) inside my city analysis and I want to make several different new layers out of them.
I want to find out, which places have which ...
- 11
0
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0
answers
27
views
Updating geometry by extracting line feature centroid in QGIS
I have two layers, one with polylines and one with points. The layers are related by the field "Netz_ID". I want to write a QML function I can use in QField to update the point geometry of a ...
- 1
4
votes
1
answer
101
views
Showing QGIS Print layout extent in map as polygon
I would like to display the extent of the various print layouts in the QGIS map as a polygon. To create a kind of overview map where the individual folder sections are shown. I know a manual ...
- 333
2
votes
2
answers
116
views
Selecting only features that have another layers feature on top in QGIS
I have an aerial fibre plan and splitters on certain poles (these layers overlap each other). There are over 3000 poles and only 1699 of those poles have a splitter on them.
Is there any way I can ...
- 29
2
votes
1
answer
31
views
Self-referencing objects inside functions on print composer
I'm writing a function to display different intervals on a map grid depending on its scale, something like this:
This function is applied to and references the map called "Mapa_principal_R."...
- 217
2
votes
1
answer
62
views
Creating polygon from selected lines in QGIS
I have a line layer representing a street grid. I need to select a bunch of these street segments and turn them into a polygon. I have tried using Vector > Geometry > Lines to Polygons, but the ...
- 225
0
votes
0
answers
58
views
Converting vector points to raster
I'm currently working through An Introduction to Species Distribution Modelling (SDM) Using QGIS and R by Colin MacLeod, and I am having issues with the first exercise, which requires me to convert ...
1
vote
1
answer
52
views
How to snap Heatmap to outline of an island in QGIS
I am creating a heatmap of seabird nest locations on an island. However, some birds nest close to the coast, and part of the heat map extends into the ocean. How do I 'snap' the heatmap to fit the ...
- 13
1
vote
2
answers
67
views
Calculate weighted raster values per polygon depending on overlap with vector layer
I have a raster layer in which pixel values represent percent cover of shrubs per pixel. Since each pixel is 100 m^2, I can use the percent cover as the area, e.g., a value of 5% would equal 5 m^2 ...
-2
votes
1
answer
43
views
We getting different scale of dxf to base DWG file once we did georeferenced in QGIS? [closed]
We getting different scale of dxf to base DWG file once we did georeferenced in QGIS ?
-1
votes
0
answers
69
views
Clipping a raster layer to a polygons shapefile but nothing is actually clipped
I am using QGIS. I have the following polygons shapefile of the New York City Boroughs at
EPSG:2263 - NAD83 / New York Long Island (ftUS)
I then have the following raster grid showing a KDE heat map ...
- 7
0
votes
0
answers
22
views
SLD styling into GeoServer
I uploaded a SLD styling I made in QGIS into GeoServer, but I keep getting an error that he cant find the column. but GeoServer that the column is available.
I also compared the styling with almost ...
- 1
0
votes
0
answers
29
views
QGIS: Problem with importing Calculations (.sol) as a layer source [closed]
I've got the problem that I can't import my calculations (.sol) as the layer source. Each time I try to import it it shows that the process was successful, but it wont show up below.
I'm using the ...
- 1
1
vote
0
answers
92
views
Converting CSV spreadsheet to shapefile in QGIS
I have a spreadsheet with the coordinates beginning:
Site Latitude Longitude
1 -37.3412 145.182
2 -37.3410 145.182
3 -37.3408 145.182
4 -37.3406 145.1821
5 -37.3404 145....
- 11
0
votes
0
answers
19
views
"Qneat3GeometryException: Dataset has wrong geometry type" error when running QNEAT3 Iso-Area as Polygons (from Layer) on QGIS
I got the following problem after executing the QNEAT3 on QGIS 3.38. How can I resolve it?
[QNEAT3Algorithm] This is a QNEAT3 Algorithm: 'Iso-Area as Polygons (from Layer)'
Traceback (most recent ...
- 1
1
vote
1
answer
90
views
QGIS – Add columns (number and names) based on the content of another column
Is it possible in QGIS to create new columns based on the values from a concatenated field within the same table?
For example, I have a table with data that looks like this:
I would like to add a ...
- 825
1
vote
0
answers
34
views
Use of matrix DBF table in QGIS
I have a shapefile with 3 fields. (For example fields A,B and C). Fields A and B are filled with data in the shapefile, field C is virtual. Next to it I have a dbf table. In the rows I have A values, ...
3
votes
1
answer
161
views
QGIS scale-based callouts
Is it possible to have scale-based callouts?
I want to display callouts if I zoom out and the scale is larger than 8000.
I have tried rule-based labels and checked the scale range and set the minimum ...
0
votes
0
answers
59
views
Text from Excel - No co-ordinates [closed]
I need to import a list of erven into QGIS from Excel. I have a list of erf numbers that I would like to present on a drawing in map format. The trick is that I need these erf numbers to be identified ...
1
vote
0
answers
29
views
How to visualise 'simple' 3D vectors and points in QGIS
I am trying QGIS to visualize and analyse photo obtain with a drone.
I have a list of point where the photo have been taken (longitude, latitude, and z).
At each point, I would like to plot the drone ...
5
votes
1
answer
155
views
How can I create a print layout that is exactly filled with the contents of a shapefile?
I need to create a physical map with exact dimensions. The contents of that map should exactly match the contents of a shapefile layer that has a single rectangle in it:
So the map should just be the ...
- 153
-2
votes
0
answers
26
views
Adding plugin on QGIS iOS version- using iPad Pro [closed]
I can’t find a way to install the plugin on my QGIS app on iPad as I can’t find the link to the zip file
0
votes
0
answers
54
views
Determining the visual obstruction in line of sight in QGIS
Based on the planning of a wind farm (numbered dots) with a total of seven wind turbines, I would like to determine the area that theoretically lies within the visual axis of the monuments (blue and ...
- 555
-2
votes
0
answers
24
views
Permission denied for database datacube [closed]
I am trying to run a file in a Google Colab but I am getting a error like I can't access the database datacube. What should I do?
Initialising database...
Traceback (most recent call last):
File &...
0
votes
0
answers
15
views
R.reclass is nowhere to find
I cannot find r.reclass in Processing - Toolbox.
I have GRASS plugin installed also. But it still does not work.
- 11
1
vote
0
answers
39
views
"Geometry error: One or more input features have invalid geometry." error when polygonizing in QGIS
How do I fix this raster that I aim to polygonize via QGIS?
For context, the raster is created from DEM STRM data. I tried to check whether the reclassification is the issue but the general log ...
3
votes
1
answer
69
views
Vector nodes no longer highlighted in QGIS
I'm using the latest version QGIS 3.34.13. When I have used QGIS before when I hover the mouse over e.g. a line or polygon in a vector layer then a small blue box will appear when I am close to a node....
- 135
2
votes
0
answers
54
views
Calculating GPS coordinates in QGIS as an attribute
How can I add a field in a point layer (QGIS 3.34) that calculates a dynamic azimuth to my GPS position?
Background: I have a point layer and want to navigate to the points. I could add the azimuth as ...
- 23
0
votes
0
answers
49
views
Raster reclassification with QGIS
Is it possible to assign a value to each pixel in this image from the legend
which is in *.png format with QGIS?
I have an image whose pixels do not contain the values as shown in the legend. The ...
- 2,425
5
votes
0
answers
53
views
Is it possible to organize PostgreSQL connections into folders in QGIS Browser?
Is there any way to organize PostgreSQL connections into folders? I use several dozen connections, and it gets messy in the Browser panel. The ability to organize individual connections into folders ...
- 51
0
votes
0
answers
12
views
QGIS plugin QNEAT3 iso-area polygon (by Layer) does not output Unique Point ID Field
In the QGIS plugin QNEAT3 iso-area polygon (by Layer), I have a Unique Point ID Field in my input Start Points (i.e. 1, 2, 3, 4, 5, 6 up to 10).
My iso-area distance set to 2500 m with an interval of ...
- 23
4
votes
1
answer
71
views
Getting attribute from CSV with QGIS Modeler
I am trying to build a tool in QGIS using a CSV-table with a similar structure as shown below. My goal is to filter the CSV-table for input parameter "category" and the input parameter "...
- 43
-1
votes
1
answer
32
views
Does HydroSheds (https://www.hydrosheds.org) provides labels?
I've been following a simple tutorial that uses HydroShed files. Everything went smoothly, but I would like to also add labels for some of the rivers plotted (eg: Orinoco). Anyone with experience ...
- 1
0
votes
0
answers
26
views
QGIS ignores argument "direction_range" for GRASS r.viewshed
I am trying to run the GRASS tool r.viewshed in QGIS. The GRASS tool includes an optional parameter direction_range which lets you analyse a specific horizontal angle range. In the QGIS GUI this ...
- 1
0
votes
0
answers
44
views
Updating a PostGIS layer from a geopackage layer with additional features [closed]
I have a layer named polygon in my PostGIS database. I would like to perform an update and append on the database layer using a geopackage layer that contains additional features to the ones in the ...
- 320