Questions tagged [qgis]
QGIS is a cross-platform GIS application licensed under the GNU General Public License.
34,651
questions
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2 views
What is angle value in Points along geometry in QGIS
I generated the points along geometry from Processing toolbox and there is angle field as default. What does it stand for?
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1answer
10 views
Putting coordinates of end point in shortest path algorithm
How do I put the coordinates (x,y) of the end point of the shortest path algorithm (from vector to point) which is part of a QGIS model?
I'd like to get the calculated coordinates of a point (with the ...
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6 views
Coordinate transformation of QgsMeshLayer programatically?
I'm using the MDAL provider to load NetCDF data as a mesh layer in QGIS (3.20). The CRS metadata I wrote for the files doesn't seem to translate to QGIS, so I tried to make use of the ...
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17 views
Making map more interactive
I have created a map using QGIS and I am planning to put it online using QGIS2Web. However, QGIS2Web does not provide much options of making the map interactive. One of my goals is that when a user ...
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4 views
Add column to the GCP Table in QGIS Georeferencer
I am using the QGIS Georeferencer plugin to georeference an aerial image. For each GCP, I would also like to track some metadata about that GCP—for example, whether the GCP is a natural feature, a ...
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5 views
Unable to save project on QGIS - unable to Zip
I get an error to save a project on QGIS that it is unable to save or unable to zip.
I have checked my system preferences Security and privacy in system preferences to make sure QGIS has access to my ...
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0answers
20 views
I am facing an error in QGIS with the name "An error has occurred while executing Python code: "
The error is caused by Update tables in a plugin named MOLUSCE.
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0answers
24 views
Sum attribute values from several vector layers within square grid cells in QGIS
I have 30 vector layers, each one containing a large number of polygons. In the attribute tables the polygons are valued as 1, 2 or 5 depending on what kind of ecosystem service they represent (...
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27 views
Adding new field to one attributes table based on the field on another attributes table in QGIS
I have two Geopackage layers on QGIS 3.22.2. One first one (LAST_ROUTES) shows the random extracted lines (routes) from the Istanbul highway map. Second one (LAST_POINTS) shows the points generated on ...
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14 views
QGIS: Erreur lors de l'exécution de l'algorithme Hight level design float division by zero
Bonjour à tous.
Je suis en train de Démarrer l'algorithme [step 3] high level design GPON network.
Mais cela m'affiche une erreur que je n'arrive pas à ressoudre.
J'ai suivi pluisieurs instruction ...
3
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3answers
54 views
How can I calculate the raster counts within an overlapping polygon in QGIS?
I have a raster with land use classes (see image). I want to count the pixel values (i.e. the classes) within the blue perimeter. In QGIS, there is a tool called 'Raster layer unique values report' ...
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8 views
QGIS 'layers not correctly generated' error when performing SAGA operations
I have been trying to execute a number of commands and I keep receiving the error: "The following layers were not correctly generated."
Sometimes it will produce results anyway, and other ...
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0answers
13 views
GRASS function r.fill.dir not working on specific DEMs
I'm using QGIS. The function r.fill.dir is not working on a few DEMs I'm working with. With other DEMs, it works. I attached the log report and one of the troublesome DEMs. You can see my QGIS ...
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0answers
19 views
Accessing QGIS attribute table description details
I have opened a set of .kmz files in QGIS. When I inspect attributes related to specific details from the map space I can see the metadata is there (material, date, diameter etc...). However, when I ...
1
vote
1answer
23 views
Nested for: Outer for doesn't iterate
I wrote a code with a for nested inside another for.
When I execute the code, the outer for starts with the first feature, runs as expected, then gets in the second for, runs it as expected, but then ...
0
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1answer
30 views
Combining all features into one in same shapefile in QGIS
I am creating fiber routes on a CAD drawing and need to merge the features in the same shapefile. Application websites will not allow me to upload because it has several line features. I need every ...
0
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1answer
23 views
Terracing / stepping artefacts after converting lidar DTM from float32 to uint16
I am a beginner QGIS user, using it to supplement other skill sets in 3D modelling and rendering.
I am trying to use UK lidar data in Blender to render 3D topographic maps. For this to work correctly ...
6
votes
3answers
100 views
Showing data from attribute table in legend in QGIS
I have multiple points with locations on a map and I want to calculate the exact number of points for a selected area.
I created a polygon and with Numbers of points on the polygon I created a new ...
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0answers
19 views
QGIS: Polygon split by lines not working?
I have a polygon in QGIS consisting of a dissolved set of shapes. My objective is to split this shape using the lines from a set of Voronoi polygons.
To do this I calculated the Voronoi polygons, and ...
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0answers
30 views
Georeferencing PNG image by GDAL in QGIS
I am not familiar with GDAL so far. Thereby I don't know how to start. By knowing the problem from the question below:
Georeferencing PNG image in QGIS when the coordinates of image corners are known
...
0
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1answer
16 views
Rotate markers along a line using a geometry generator
I would like to create a line style for projected tracks. Every kilometer on the line there should be a marker with a number. I hope it possible using geometry generator.
Making markers after 1000 ...
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1answer
20 views
Planning Fiber Optics Using QGIS
What are the steps and tools to planning FTTX/Fiber Optics using QGIS. I need a good tutorial suggestion on this.
0
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1answer
20 views
Problems when moving QGIS files between computers
I have tried uploading QGIS files together with the CSV and shp files behind all layers to another computer (via usb) for others to continue working on it. Now when we open the same file and update ...
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0answers
16 views
Does QGIS support AWS Redshift connection?
I am planning to connect AWS Redshift using QGIS for work purposes. However, I am not sure whether I can connect or not.
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0answers
29 views
QGIS 3.16.16 OGR error Coordinates
I am editing shapefiles that are derived from data measured with a GPS. I have made several adjustments without problems. Suddenly when I want to add a point to a feature or want to add a new feature ...
2
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1answer
114 views
QGIS extract data from one column in data attribute table
I have a problem similar to this question somewhat...
GeoJSON format to CSV
where everything is bounded in just one column instead of a few as it should be.
I have both <br> and the : separators....
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0answers
23 views
QGIS 3.16.16 and Sharepoint
My company is transferring to using Sharepoint. Currently we are using a driver system.
We think we might run into the problem that paths to sources we use will be linked to our personal account of ...
2
votes
1answer
39 views
Moving lines startpoint and endpoints to coordinates
I’m trying to make a script/function with the field calculator, or the modeller, or even the Python interface, in order to move lines startpoints/endpoints over given points.
I have three layers:
...
1
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1answer
12 views
Reading/writing PostGIS layers with qgis_process-qgis command line tool
How do I use the qgis_process command line tool with PostGIS layers as input and/or output?
2
votes
2answers
43 views
Automatically populating point layer with ID of polygon it intersects in QGIS
I am using QGIS 3 and trying to populate a column of a point file that has rare species data. One of the attributes is a Wetland "ID" column. If any of my rare species points are within a ...
2
votes
1answer
41 views
Geting elevation data from online services in QGIS?
Is there a way to add an elevation data provider in QGIS - something like XYZ tiles connections?
There are many providers available online
(like this one - Terrarium elevation data)
When I add them as ...
1
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0answers
17 views
QGIS forcing labels for separate feature parts into the same part
I have noticed that if there is a feature that has very small parts in addition to a "main" part, and you have checked the boxes for both 1) "label every part of multi-part features&...
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0answers
30 views
Why is my buffer not showing in QGIS 3.16.15?
I've recently tried to create a buffer around a dissolved vector polygon layer. Here's the vector polygon:
When I tried to create a buffer, it seemed to be working fine. I could enter a distance ...
0
votes
1answer
25 views
Making sense of why and when polyline matches what is shown in Google Maps
By making Google Maps API call, I received a response JSON which contained this polyline1:
ezdvBcps}Lt@W@F@BVKl@UK]Wc@}@kAOKBEzA{BdA}Ab@s@LBf@RjARZBv@?rAAfBIX?f@FLBf@^b@hATbAF~@BvB?hALjBHpCLjAVdAd@...
5
votes
3answers
231 views
Creating circle around point with specific radius taken from column in QGIS [duplicate]
I have a shapefile of points (SR EPSG:3857 - WGS 84), with (in the attributes) an "ID" column for each point, and a "radius" length in meters; I am trying to find a way to create a ...
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0answers
11 views
Entry Point Not Found on qgis_core.dll
I would like to know how to set it up correctly in Visual Studio on a Windows system to be able to use the QGIS C++ libraries. I tried a few things, but the running result of my project is always that ...
0
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1answer
30 views
QGIS server href links point to a URL containing the docker network name instead of keeping its base value
I have a QGIS server (using https://github.com/camptocamp/docker-qgis-server) project to serve some data using OGC API - Features.
It's working properly at a new /wfs3/ endpoint in the nginx ...
0
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1answer
53 views
GeoTIFF changes location relative to vector layer when panning map screen
The problem that I have is two layers are not positioning themselves correctly on the map screen, and shift position further when I pan the screen (they move closer or further away from each other, ...
0
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1answer
11 views
Correct measure unity for slope and aspect in order to work in QGIS with "r.sun.insoltime"
I'm using QGIS 3.10 and I should create a raster that shows the hours of sunlight referring to a given day for my province. r.sun.insoltime (Fig. 1, sorry it's in Italian but I traslate) to work asks ...
3
votes
3answers
191 views
Select polygons within polygons in same layer
I have a buildings layer that actually has a flaw. The inner courtyards, drawn as another polygon within the building polygon, should be islands of the building polygons. Instead, they are other ...
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0answers
22 views
Make live tracking QGIS map working in web
I have a spatial point data in SQL Server and I add it as MSSQL server Spatial layer, then I export it to web using qgis2web plugin. Now if the point location changed the change is not reflected to ...
0
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0answers
31 views
QGIS not exporting all features in shapefile
I have a text file containing 2.2 million records.
I have used the QGIS Data Source Manager Delimited Text method to read it in and display it. All 2.2 million records have been successfully projected ...
0
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1answer
24 views
Division of polygon into irregular shape and varying area of polygons
I have a major polygon and with its area, I want to divide this polygon into any numbers of sub polygon. I have also area of sub polygon and number into which major polygon is divided.
I want to ...
1
vote
1answer
27 views
Can't merge two layers because of field length in QGIS 3.16
I'm trying a model which did work with QGIS 3.12 but don't in QGIS 3.16. In this model, two vector layers are merged by the algorithm native:mergevectorlayers. In the new version if a field of ...
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0answers
19 views
Imported SVG's stroke width out of proportion in QGIS
I created a couple of SVGs in Inkscape for use in QGIS recently, following this video tutorial, which worked quite well. However, I have one SVG, that behaves normally in Inkscape, but on import into ...
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0answers
44 views
Not Geotagged photos in QGIS
Is it possible to import un Geotagged photos in QGIS?
As far as I know this was possible with plugin called eVIS.
As I see it, presently, all the photos which are to be displayed, on a map e. g., in ...
3
votes
1answer
75 views
Input App showing only two pictures
I am trying to add more than one pic in my QGIS project layer. Like in any one feature layer add new field (pic1, pic2,pic3, pic4 etc), but problem is Input App shows only two images in mobile Input ...
0
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1answer
16 views
How to upload .gpx.xml files into QGIS?
I have a file with the following extension .gpx.xml taken from the following website: walking
However, I don't know how to import the file when it's both in .xml format and .gpx format. What methods ...
0
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0answers
16 views
QGIS - how to rasterize polygons
From polygons, I would like to create multiple masks or a single multicolor mask as raster (tif) image.
the source data (if imported using geopandas) has the following columns:
zone (values 0, 1, or 2)...
0
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0answers
38 views
Clipping unnecessary areas while using Contour plugin in QGIS
I have a point shapefile with z values which I would like to create a contour file based on. I used the Contour plugin in QGIS, however, as shown below, QGIS drew contours in the areas where I don't ...
