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Questions tagged [qgis]

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

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In qgis field calculator copy everything from column after first - symbol

As title suggests, how can i simply copy everything from a column that is after a -. Chatgpt gave me this (which doesnt work) substr("name", strpos("name", '-') + 1, length("...
Gregory C's user avatar
  • 353
2 votes
1 answer
21 views

Merge two rasters with the rastercalculator

I like to merge two rasterlayers with the rastercalculator. The Layer_1 rasterlayer have a rectangularshape with a NoData Area in the center (white area). The uniform value is 10 (green area) and the ...
Kai's user avatar
  • 33
2 votes
0 answers
16 views

How to combine multiple point layers in a heatmap not by density of specimens but by density of species?

Sorry if my english is not perfect, it's not my first language! My problem is the following: I'm trying to combine multiples point layers in a heatmap but I'm not sure that a heatmap is the best ...
Noyirox's user avatar
  • 21
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0 answers
24 views

How to clip a raster file using a GeoJSON?

I am trying to clip or crop out the area of interest from a multi-spectral tiff file downloaded from Sentinel-2, using Rasterio and GeoPandas. For reference here are the code snippets - import ...
Anurag-Sharma's user avatar
0 votes
1 answer
23 views

Can a layer style be read-only or locked to a GeoPackage?

Can I "lock" a style to a layer in a GeoPackage file? In a QGIS project I can set a layer to be read-only from the Project Properties -> Data Sources. This makes the layer read-only. But ...
jeemil's user avatar
  • 21
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0 answers
25 views

QGIS DEM to elevation Points, pixels not centred

I have a DEM which I'm trying to convert into a point layer in QGIS. I used the raster pixels to points tool, which seemed to work, except that the points are not in the centre of the DEM pixels. They ...
user240982's user avatar
2 votes
1 answer
82 views

QGIS is not providing me with any options in Labels, Symbology, or Masks

I am encountering an issue with QGIS where the options for Labels, Symbology, and Masks are not appearing or accessible. This problem is preventing me from properly labeling and styling my map layers, ...
Lazy's user avatar
  • 21
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0 answers
30 views

Unable to move Project Folder in QGIS

I have a project folder containing the project .qgz and all the associated datasources. QGIS 3.34.4. Have ProjectProperties>SavePaths set to 'relative.' Would like to move that project folder to a ...
Pete's user avatar
  • 1
0 votes
0 answers
22 views

KMZ with Photo attachments in QGIS

So I have a KMZ file with a point layer and photos attached to each point. I'm wondering if there's a way to interact or display this in QGIS? I can drag the KMZ into Google Earth and it displays my ...
boreal's user avatar
  • 19
2 votes
0 answers
32 views

How can I detect which geometries degenerate into lines on running QGIS difference tool

I run difference tool between two area layers. Sadly, it failed with "Could not add feature with geometry type MultiLineString to layer of type MultiPolygon" It seems that some of geometries ...
reducing activity's user avatar
3 votes
1 answer
87 views

How to stretch an image into polygon symbology on QGIS?

I have a world map polygons (vectors) on QGIS 3.28, and i want to add flag on each country. I have already a svg flag for each country on a field, but flags are represented like a mosaic: I try to ...
Rien Avoir's user avatar
-4 votes
2 answers
56 views

How does one resample a 20m resolution satellite image to 10m resolution, such that it matches a native 10m resolution image?

I feel like this should be an easy question and is already answered, but I am not finding the thread/post addressing my issue specifically. I am trying to use Python to perform my GIS analysis. ...
tds's user avatar
  • 91
0 votes
0 answers
23 views

How do I speed up selection of a large number of features

I'm looking for ways to speed up selection of a large number of features (10k+) from a list of attribute values. I'm developing a plugin to trace a pipe network, and select the tranversed pipes. The ...
timothyh's user avatar
0 votes
1 answer
28 views

QGIS display 'name' or 'title' of the active layer only (view-decorations-title)

I want to display the 'name' or 'title' of the active layer in View-Decorations-Title, I found in "Automatically create an array of all visible layer names in QGIS" the answer: ...
Javier's user avatar
  • 3
0 votes
1 answer
22 views

QGIS Global Variables Editing

I am trying to clean out some of the variables that I have created over time, but QGIS won't allow me to edit or delete any of the user define Global Variables From the GQIS documentation, it looks ...
user231744's user avatar
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0 answers
22 views

How to make PyQGIS to return 4 raster subdivisions calculated by inequations

I've been making in Raster Calculator, one by one, for every Return Period (2, 5, 10, 50, etc.) different sub-rasters of 4 sections of water depth, it's very tedious and I know there is a faster way ...
Alex C's user avatar
  • 1
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0 answers
34 views

QGIS: calculate angle to an azimuth of a point

I have the following problem: Given is a point layer with the attributes 'ID' and 'Azimuth'. 'Azimuth' reflects the orientation of the objects in degrees. Now I want to create a grid that shows the ...
Tobas G's user avatar
-1 votes
0 answers
22 views

How to combine the image data of that famous Greenland study to produce the fully rebound Greenland Map they show in the study

So, according to the guys that made the paper, Total isostatic response to the complete unloading of the Greenland and Antarctic Ice Sheets they created their map of rebound Greenland and Antarctica ...
The Great One's user avatar
-2 votes
0 answers
17 views

En Qgis 3.36 no aparece el botón de Aceptar al intentar crear una nueva capa [closed]

Pues que no aparece ningún botón para crear una nueva capa. Yo creo que en esta versión de Qgis 3.36 si lo podía hacer antes sin problemas. En Capa -> Crear capa -> Nueva capa de archivo shape......
FranciscoDíez's user avatar
0 votes
1 answer
36 views

QGIS latest installer for Windows

We are testing installation of QGIS on Windows 10 x64 VM. As per the download page "The current version is QGIS 3.36.3 'Maidenhead' and was released on 17.05.2024. The long-term repositories ...
Meta Data's user avatar
1 vote
1 answer
48 views

Reset style in QGIS3

I try to erase, make blank, or no-style layer, as you want. I don't find any option in QGIS, so I try Python but from qgis.core import * import qgis.utils layer=qgis.utils.iface.activeLayer() layer....
pasqal's user avatar
  • 528
0 votes
0 answers
19 views

Using the Model Designer in QGIS 3.34 for automated selection by position and expression in an iterative way

I have not been able to find an effective solution to the following problem in QGIS (3.34.7-Prizren) with the Model Designer. Task: The data of windows (number, height, width) must be entered in the ...
GIS_Noob's user avatar
1 vote
2 answers
64 views

What is the correct format to add a custom XYZ tiles {zoom}/{x}/{y}.png) layer in QGIS 3?

I have tiles loaded for a Leaflet map that work fine in Leaflet but I am having difficulty using these tiles with QGIS. They are loaded onto AWS. The psudo url is: https://mytiles.s3.us-east-2....
Cary H's user avatar
  • 986
0 votes
0 answers
34 views

export not working [duplicate]

The map is 12000*12000 pixels, and the four corners of the map are created at 122.921°E~156.890°E and 20.413°N~54.382°N. I added a new projection to it +proj=eqc +lat_ts=35.025 +lat_0=0 +lon_0=135.762 ...
A. J.'s user avatar
  • 1
3 votes
1 answer
59 views

Snap polyline to another polyline's vertices

I have got a polyline layer which has its own vertices (blue line in image below) and another polyline layer with a slightly different alignment and vertices in different locations (red line in image ...
Sken2107's user avatar
  • 220
0 votes
0 answers
23 views

Extension cadastre (QGIS/EDIGEO data)

I try to use cadastre extension 1.29.1 with QGIS LTR 3.34.6. I import EDIGEO data. The vector data are displayed but without the toponym! so The map doesn't read: cadastral plot number. Street names. ...
user243421's user avatar
2 votes
1 answer
88 views

How do you load a .1x1 (bathymetry) file in QGIS?

I have received bathymetry data in a .1x1 format, which appears to be a challenge to load directly into QGIS. The raw file is structured as a CSV with four columns, containing coordinates, depth, and ...
Sytze's user avatar
  • 771
4 votes
0 answers
28 views

Closing connection to SpatiaLite DB in QGIS

I have a SpatiaLite DB that has been used to generate some layers in QGIS (via a PyQGIS script, using the native:extractbyextent processing tool). Once these layers have been generated, they are saved ...
Tom Brennan's user avatar
  • 5,102
0 votes
0 answers
16 views

Errors when using LASTools in QGIS 3.36.2

I am currently proceeding .las file in QGIS3.36.2. To do this, I used Plugins to download LAStools and tried to use lasview function to visualize the 3D terrain. However, I got the following ...
kun zhao's user avatar
0 votes
1 answer
27 views

QGIS: Top symbol based on comparing values across different layers

I have several layers which overlap sometimes. I want the symbol visualized on top to be based on the smaller value between the three layers. How can I do that?
user243380's user avatar
4 votes
1 answer
80 views

Integrating an External Python Script into a QGIS Project Macro

Is it possible to integrate an external Python script into a QGIS project macro? I have a relatively large macro that executes various Python commands at the start and end of the project. For better ...
MartinMap's user avatar
  • 8,326
0 votes
0 answers
24 views

QGIS: data offset issues when loading different coordinate systems

Set the project coordinate system to EPSG:4326, load OSM's WMTS data with EPSG:3857, and load an SHP file with EPSG:4551. When the WMTS is at different zoom levels, the position of the SHP data on the ...
Giser's user avatar
  • 21
2 votes
0 answers
23 views

QGIS: Display in ECEF Coordinate Systems issues

When the QGIS project coordinate system is set to EPSG:4978 [1] and the OSM WMTS with EPSG:3857 is loaded, the WMTS is not rendered on the canvas. However, when the project coordinate system is set to ...
Giser's user avatar
  • 21
-1 votes
0 answers
24 views

How do you graduate a pathing report with point data and no weighable criteria [closed]

I am looking for advice on how to best symbolise point data from a pathing report where there are overlaps, but no weighable criteria associated with each of the individual points - I have tried point ...
jabber95's user avatar
0 votes
0 answers
23 views

Unable to load GeoTIFFs with Capabilities XML document using WMS/WMTS in QGIS

I have a GeoTIFF file that has bands with float64 data type. I can load this as a standalone raster image, however, when I try to load that same file via a GetCapabilities response document, QGIS ...
RasterDisaster's user avatar
1 vote
1 answer
27 views

ogr2ogr gives an overflow error

I'm trying to use ogr2ogr to import shapefile data in my PostgreSQL database. The MAC command line I use for this is export PGPASSWORD=xxx* ogr2ogr -skipfailures -nln xx_table -f PostgreSQL PG:"...
Thomas's user avatar
  • 11
0 votes
1 answer
32 views

Putting QGIS 3.34 scratch files in a ramdisk (Debian 12)

I'm new to QGIS. I used GRASS a few years ago but it looks like QGIS is a bit simpler. Anyway I was merging USGS DEMs and noticed the peak ram used was 5GBytes. "TOP" indicated about 9GBytes ...
user334814's user avatar
0 votes
1 answer
37 views

Realtime Join by Location and Summary

I have a vector file with multiple polygons and multiple location points, I am adjusting the polygons and want to get a realtime count as a label maybe as to how many points are in the polygon, is ...
Vibhava B K's user avatar
0 votes
0 answers
32 views

Separate overlapping features

I have an issue with a specific QGIS Layer. The layer represents blocks in a city. It's made of polygons, each one representing a street, a square, a building a park and so on. When selecting the ...
Frannzz's user avatar
  • 11
0 votes
0 answers
16 views

QGIS: "Export Mesh on Grid" not working with "Export Vector Option" enabled?

I need to sample the vector data from a Mesh to a grid, and was hoping to use the Processing Script Export Mesh on Grid, with the Export Vector Option enabled. (pic. 1) Unfortunately the whole ...
Julian W.'s user avatar
0 votes
0 answers
24 views

QGIS: display a common graduated style based on a common attribute column of all layers

QGIS: I have several layers which contain the same attribute with different values (for example attribute X). I want to display a common graduated style based on the common attribute column of all ...
user243380's user avatar
0 votes
0 answers
27 views

Can not find HTTP Headers sent from QGIS to GeoServer (Koop)

I'm setting HTTP Headers in QGIS: I expected "x-my-extra-info" to show up in the request headers in Koop (an Express app). However, I've console logged the headers (and rawHeaders) and don'...
Todd R's user avatar
  • 101
3 votes
1 answer
82 views

Excluding some values from the quintile classification in QGIS

I am working in QGIS with a vector layer of about 8000 records and I would like to use the graduate symbology, equal count (quantile, 5 classes) with a variable that contains some records to which the ...
Geo_it's user avatar
  • 523
0 votes
0 answers
15 views

pgRouting, pgr_withpoints issue

I have this code, SELECT * FROM pgr_withPoints( 'SELECT id, source, target, st_length(st_transform((ST_Dump(the_geom)).geom, 4326)) AS cost FROM network_updated', 'SELECT pnt.id AS pid, edg....
yassine's user avatar
0 votes
1 answer
30 views

Calculating Wet Season Average Precipitation Data in Google Earth Engine

I want to extract and create a map visualizing the average precipitation data between the years 2000-2023 during the wet seasons only, i.e.(Nov-Mar). However each time I run the code I get this error: ...
Daan's user avatar
  • 3
0 votes
1 answer
76 views

Export Feature as GPX from Virtual Layer Using Right-Click in QGIS

I want to export a feature (line/multiline) as GPX using a right-click in the canvas. The feature to be exported is in a virtual layer (e.g., "RoutenUnion"). The clicked feature is in ...
MartinMap's user avatar
  • 8,326
3 votes
1 answer
185 views

Repeat a linestring across a farm field at 40 inch intervals to use r.report for pixel values

Hi I am a new user to QGIS. I have googled,youtubed and SE all day today. I have found answers to most of my issues. This one has me stuck. I have included an image of the project I am attempting to ...
Jess Woeltje's user avatar
0 votes
1 answer
23 views

How do I enable linting in PyQGIS modules on MacOS?

I'm running QGIS 3.36 on a MacBook Pro M1. I would like to work on a processing script, but of course I would like to do this in my IDE (VS Code) not the built-in console. I have QGIS installed in ...
auslander's user avatar
  • 1,527
0 votes
0 answers
56 views

How to export a map as image with a specific extent [closed]

The map is 12000*12000 pixels, and the four corners of the map are created at 122.921°E~156.890°E and 20.413°N~54.382°N. I added a new projection to it +proj=eqc +lat_ts=35.025 +lat_0=0 +lon_0=135.762 ...
A. J.'s user avatar
  • 1
0 votes
0 answers
56 views

How to work multiple users in the same geopackage using QGIS

I'm having a problem when multiple users have to access, manipulate or just view the same database. Sometimes the user needs to edit some information in the rows of the attribute table, or to change ...
Kledson Lemes's user avatar

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