Questions tagged [qgis]

QGIS is a cross-platform GIS application licensed under the GNU General Public License.

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GDAL Rasterization not working in QGIS graphical modeler

I have the following graphical modelling command to rasterize a point layer output. However, it gives the following error in the log and doesn't create a raster. Running Rasterize AEP habitat fuzz [...
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18 views

Merging selected features based on multiple conditions using QGIS

I am new user of QGIS. I'm working with a shapefile including polygons which represent the footprint of a building or parts of it (if parts have different heights). I would like to merge these parts ...
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1answer
44 views

QGIS server connection times out when trying to reach the /wfs3/collections endpoint

This is the landing page of a QGIS server instance (camptocamp/qgis-server) which connects to a containerized PostGIS database to serve some vector data using the "OGC API - Features" (aka ...
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15 views

Retaining translucency using Qgis2web plugin

I am using QGIS 3.16. I'm trying to export a thematic map to web with plugin, but the export does not retain the translucency needed to see the base map underneath the thematic map. How do I retain ...
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1answer
16 views

GDAL Vector to Raster Conversion Not Working

I have a point shapefile that has a field AEP_fuzz and I want to convert to a raster. The field type is double and I get the following error: GDAL command: gdal_rasterize -l INPUT -a AEP_fuzz -tr 25....
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2answers
30 views

QGIS: Randomly generate points using weights from raster

I need to randomly generate 10K points throughout my region of interest, but I need to weight the point selection by a set of probability weights, stored as a raster - such that higher probability ...
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13 views

Geometric network plugin for QGIS

I want to implement geometric networks in QGIS but I can not find any plugins or tutorials explain it. Is there such a plugin in QGIS?
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0answers
38 views

Dynamically placing labels relative to their predecessor in a multi pages atlas

I have a QGIS 3.22 vector layer which comes from an OGC API - Feature provider (WFS-3). This service is feeding features as large GeoJSON objects, all with the same structure but which content (mostly ...
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2answers
185 views

Multiple base map in Qfield?

Is it possible to load 2 base maps in Qfield (both of the 2 rasters are in geopackage format), and choose wich one I want to see and maybe switch during the field work ? I tried with the map themes ...
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1answer
82 views

Why highlighting duplicates does not work in QGIS?

I have used the formula from this query Identifying duplicate attributes in field using QGIS: count(1, "FieldWithDuplicates") > 1 but it doesn't work in my case, just highlights each ...
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42 views

Text file auto-loading incorrectly in QGIS

In QGIS 3.18. I have a tab-separated text file (.txt) loaded as a table. This table serves as the layer reference for the Value Relation widget for several fields (that is: the allowed check box ...
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19 views

File type for value relation widget in a shapefile (QGIS)

In QGIS 3.18. This question is related to this one which has not been answered; my hope is that a broader question will help solve my problem. I have a shapefile layer for which I want some attributes ...
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4answers
136 views

Writing Conditional in QGIS raster calculator

I have a Digital Elevation Model raster with negative values in QGIS software, I would like to know how I can multiply all negative values by -1, ie all values less than 0, turning them into positive ...
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1answer
27 views

number the soil_unit_code in a soil_id column

I believe its pretty easy to be done, but I just don't seem to see the solution in Qgis. Is it possible in the field calculator? I've an attributetable with 200 features with like 20 different ...
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1answer
16 views

Obtaining Shear Sense indicators

I have a geological map with faults and would like to display the shear sense indicators for each fault. Where can I get the symbology and how can I display it correctly? In GIS terms, I have a set of ...
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1answer
82 views

Error while running SAGA algorithms in QGIS 3.10.14-A Coruña

I've been trying to run several hydrological algorithms (Strahler, Fill Sinks etc) from SAGA in QGIS ltr and I keep running into the same error: The following layers were not correctly generated.C:\...
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2answers
57 views

Symbolizing Line using QGIS

How to represent these lines so that the flow of direction is evident? Due to the scale of the map, it looks like a solid.
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1answer
38 views

Merging polygons that touch each other in QGIS [duplicate]

I am searching for a tool that can merge the polygons that touch each other. I am not very good with python or programming. Is there a function in the toolbar that can help me with the problem? In the ...
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19 views

Extract the Lat and Long for geo tagged UAV images [closed]

I have a stream of drone images from DJI drone flowing in to an application. I have the below geo tagged information {'GPSVersionID': b'\x02\x03\x00\x00', 'GPSLatitudeRef': 'N', 'GPSLatitude': (38.0, ...
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1answer
24 views

Creating field with difference between areas of two layers in QGIS

In QGIS how can I get the difference between the areas of two layers through field calculator? And is there a way to automatize it so every time a new feature is added the difference updates? Layer 1 ...
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1answer
536 views

Merging multiple non overlapping raster layers into one layer

I'm working in Qgis 2.14 and have received multiple raster files for the Height of a terrain that combined covers the entire terrain I’m interested in. I would like to combine them. Because the ...
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0answers
50 views

Choosing geocoding Plugin to use in QGIS [closed]

I have to transfer around 1200 points into my GIS project. Therefore I have given a .csv-file with city names (partly missspelled or unidentifiable). All of the locations are in Germany (as I read ...
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1answer
1k views

Digitizing map in QGIS [closed]

I am relatively new to QGIS and using its version 1.8.0 on Windows Vista. Problem: I have to digitise an aerial map and then extract the coordinates. I have absolutely no idea how to start
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1answer
174 views

Are there plans for improving performance of vector files in QGIS [closed]

Does anybody know if there are any improvements planned pertaining to the performance of vector files in QGIS? Right now, a 1 GB file with contour lines needs several minutes to open. In addition to ...
1
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1answer
888 views

Orthophoto in QGIS to georeference for use in Sketchup 8, or how to match it with Sketchup 8 pictures?

I have a high resolution orthophoto of an area I want to rebuild in sketchup and therefore want to lign it up (georeference it properly), but all the scaling and everything I tried so far did not help ...
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2answers
1k views

QGIS: graphical-modeler to calculate area of polygons

I'm trying to calculate the area of polygons using the field-calculator in QGIS (2.0.1). If I do this manualy it works fine, but if I do this using the graphical-modeler I get NULL as area for every ...
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1answer
136 views

QGIS function like ArcGIS Planarize

I have a city road network. I have to divide sections that are separated by intersections into one level. With ArcGIS this is done with Planarize. I tried split commands, but it applies to all ...
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2answers
31 views

QGIS filter Atlas with intersecting geometries

At Show only features within current Atlas feature I learned a valuable way of using Atlas. I need to move it a step further but lack the skill. How do I filter the atlas using geometry of other ...
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0answers
19 views

Transferring TIFF-File (EPSG:3035) located in Irael to Germany (EPSG:25832) using QGIS

I've loaded 4 TIFF-Raster-Files (EPSG:3035) in QGIS. Unfortunately those are located in other countries than they need to be. (Need to be in Germany..) The last time using TIFF-Files it worked out to ...
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0answers
22 views

Converting GIS file to GEOTIFF [closed]

I need to open a file in QGIS, it was supposed to be in GEOTIFF format. And the drone guy that sent me the file will be out of reach for a couple of days. I'm trying to discover if there's any way ...
2
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1answer
39 views

Does Geometry by expression in QGIS except layer without geometry?

There is distance matrix with 9.455 features without geometries in GeoJSON format. It was created outside of QGIS with a tool similar to QGIS's "Distance matrix". The matrix looks like this: ...
5
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1answer
59 views

Get QGIS 'to_date' expression function to interpret two-digit formatted year as being 21st century

I have a string, which contains a date field. eg: "19-Jan-20" I have created a new field, which I want to store the year value, as an integer. In the field calculator, I have used year(...
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2answers
37 views

Creating Contour Lines in QGIS 3.16 with a distance of 0,10 m

I would like to create Isohypses (Shape) ("Create contour lines") with a distance of 0,10m in a Digital Terrain Model (Shape File). While processing the command, there are some errors poping ...
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2answers
79 views

Splitting feature into layers which are overlapped in same layer in QGIS

My script needs to select each feature in layer. While selecting features I found some of feature are overlapped. Feature can be selected but cannot highlight in map canvas. Is there any plugin or ...
14
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2answers
394 views

Creating equally split buffers between points in QGIS

I want to create buffers for every health facility, but they end up overlapping. How can I create buffers that split equally between the distance of 2 health facilities? Example of the result wanted ...
7
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1answer
111 views

QGIS: label only if more than 1 polygon visible in map extent?

I am working on a series of maps in QGIS. I am creating an atlas, not generated on a grid of regular size, but instead based on polygon features of variable size. Everything working well so far, ...
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0answers
17 views

Two diagrams on same layer in QGIS

I want to create two stacked bars next to each other for different polygons in a layer (see example with one stacked bar attached). Since I could not actually create two diagramms for the same layer, ...
2
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1answer
260 views

Forcing left to right order of cross section lines of river using QGIS

Based on "Generating a series of cross sections (profiles) along a line?" post, how can I force the cross-section lines to be created, thus collecting elevation data, from LEFT to RIGHT ...
2
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1answer
44 views

Dynamic parameters in Qt Designer

Started building my first plugin in qgis and looking for a way to create dynamic widget in pyqyt and Qt designer which allow user to add or delete parameters as much as he want (something like a '+' ...
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2answers
87 views

Assigning point attribute to overlapping polygon in QGIS

Are there a way to assign the attributes of a point to a overlapping polygon? I got the data as lines and points. The lines are making the polygons and the points are overlapping the created polygon ...
4
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1answer
84 views

Drawing multiple parallel lines with set distance within polygon using QGIS

I need to draw a series of parallel lines, within a polygon (See example below). Previously I have used MapInfo for this (Easy to draw a grid and delete the horisontal lines), but my workplace is ...
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0answers
27 views

Selecting parent features matching to child features using QGIS

In QGIS I set up a relation between to tables Parcels and Owners (1:n, parent= parcels, child= owners). Both share a field "index1" by which the relation is made. One parcel can have ...
3
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2answers
141 views
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Populate line's attribute fields with attributes from point features snapped to their start_point or end_point

I have a line layer (MultiLineString) and 4 point layers (MultiPoint). My line layer has 2 attribute fields, start_pt and end_pt, I need them populated with an identifier attribute (string data ...
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0answers
15 views

Converting SVG into shapefile [duplicate]

How to convert a svg file in a shapefile to read it afterwards into QGIS?
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1answer
148 views

Saving values by a Python script in a PostgreSQL database

I try to save attributes in PostgreSQL/PostGIS by a Python script. So far I get a connection and I can set an additional attribute field that I can fill with a value (it seems so). But how can I save ...
1
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1answer
73 views

QGIS Action on layer postselect object

I'm using QGIS 3.10 LTR. In my project I have a point layer (location of pictures) with 3 different actions (open file, open folder, open html). This works fine for me. To this layer I add time by ...
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23 views

Should I be cautious with my RAM memory while working with the Graphical Modeler on QGIS?

I've started using the QGIS Graphical Modeler recently and I want to know a little more about its limitations... Doing some tests on my computer, I've realized that QGIS never uses RAM memory when I ...
2
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1answer
144 views

Plotting wind vectors arrows from U and V rasters in QGIS

I have a 'U' and 'V' rasters for wind direction and I want to plot wind direction arrows in QGIS. This is easy to do in Python/matplotlib with the matplotlib.pyplot.quiver function, but I can't find a ...
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2answers
139 views

Mapping image from drone in QGIS

Is it possible to map a drone image JPEG directly over a QGIS project as a layer or is it necessary to make some post processing, because it's not rendered on it's correct position?
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2answers
259 views

QGIS 3.18 dyld: Symbol not found: __cg_jpeg_resync_to_restart

MacOS High Sierra (10.13), QGIS 3.18 Zurich, GRASS 7.8, GDAL/OGR 2.4.1, Python 2.7 DYLD_LIBRARY_PATH set to "/Applications/QGIS-3.18.app/Contents/MacOS/lib" With a fresh installation of QGIS ...

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