Questions tagged [qgis]

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

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QGIS Desktop 3.10.6 works fine when I use my laptop at the office but stops responding when using it at home

I'm stumped on why my QGIS performance is terrible when working from home but fine in the office. I am not using a vpn, all the files being used are on local hard drive, internet works fine at home, ...
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24 views

QGIS style changing

I want choose a properties of a layer and change it's style in QGIS (I have an extension for nautical symbols), but before loading files it's restricted. What I want to load is a huge amount of ...
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39 views

Adding point features by machine learning in QGIS 3.16

I've got several georeferenced traditional maps and there are circles on it. (these are the studied points) So I want to add point features to the middle of the circles. I could do it manually, but I ...
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26 views

Mapping origins and destinations to the created isochrones

I created isochrones in QGIS with an interval of 30 minutes. I have some coordinates related to some origins and destinations as well as travel time from the origins to the destinations. I need to map ...
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21 views

Raster formats that support colormaps for floating-point data in GDAL?

I am writing a program to overlay a raster image over a map in a KDE Marble project. I am using a combination of QGIS and GDAL to convert non-standard NetCDF data to a raster file. I began using ...
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21 views

Accessing a non spatial table in an ArcGIS Map Service in QGIS

I have a client who wants some information that is stored in a non-spatial table on an ArcGIS Map Service. When connecting to that service via either the Map Service Connection or Feature Service ...
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23 views

QGIS link to web server

I am working on a project for a volunteer organization and they want to know if it's possible to link a project to a web server? Along with that, they want it to be password protected. Does anyone ...
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23 views

Print layout of multiple maps revert to one identical map after save as image/zoom

I have a map with 8 graduated classes. I have created a print layout with 8 separate maps - one for each of the classes. I used "lock layers" to ensure that each separate map displays just ...
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24 views

QGIS Georeferencer Plugin missing compression parameters

I am trying to georeference a rather large PDF. I was successful in doing so without compression. However, when trying to make the map lighter, I added some compression. The options are: LWZ, PACKBITS,...
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41 views

QGIS Vector Geometry Vanished

I've been working on a project, in QGIS 3.16 Hannover (we started the project a while ago, in the Bonn version, but upgraded during the duration of project). Upon project completion we've been asked ...
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1answer
39 views

Changing symbology from simple marker into a vector (print of a building)

I've got a question about changing the symbology of a certain rule-based layer. See below as to the current simple marker: As you can see the house is given this grey color because of the added 'topo'...
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26 views

Crop a satellite image to 32 by 32 pixel

I have a satellite image of resolution size 10 m. I want to get a cropped image of 32x32 pixels of that image using a polygon. I randomly generate a polygon no matter the size but to reduce the ...
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36 views

R in QGIS not working after change of computers

I have installed, uninstalled a couple of times, but still get the same issue. Windows 7 and QGIS 3.6.1 and latest versions if R and R Studio. It used to work perfect until I changed computers. R ...
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1answer
29 views

Joining and Updating PostGIS data using QGIS

I have a PostGIS database with which I am currently using QGIS to manage the layers. Say I have a layer in PostGIS that I want to do a join to to add new data in. Is it possible to do this join in-...
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1answer
18 views

No FeatureTypeList in WFS published by QGIS Server!

The WFS URL I'm using to get service from QGIS Server has no data about the layers and features type. It should be noted that the WMS URL is ok. Is there any problem with the URL I'm using? Should I ...
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1answer
17 views

Failing to load OS .gz files into QGIS 3.16 using OS Translator II

I'm new to QGIS and not strong on writing scripts or code. That said I've installed QGIS 3.16, PostGIS 3.1.0, PostgreSQL 13 and also OS Translator 2 and followed the configuration guidance at https://...
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26 views

gdal2xyz Ignore nodata values

I am trying to export a DEM raster into a xyz file (for later use). I first clipped the raster in order to limit its extent and the lines in the xyz file. However, gdal2xyz does not ignore the nodata ...
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13 views

QGIS crashes loading raster layer (.tif) through GDAL provider

I am working on a project that uses QGIS within another application using QT Creator. When I try loading my raster data (using C++ API), I get a SIGSEGV error that traces back to my GDAL provider ...
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23 views

Cutting a raster file utilising a vector polyline

I’m on 3.16 QGIS GRASS... It hasn’t got gdalwarp. Simple issue, I have a raster file which includes two regions: land and sea. I have a vector polyline that marks the division between land and sea. I ...
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20 views

Opening .gbdtable (.gbdtablx, .atx) files in QGIS

I was given is folder of .gbdtable files that I cannot seem to add to QGIS. Eventually I need these files in .asc or .bmp format, and am using QGIS to accomplish that. I've seen info on the web about ....
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19 views

GEE, How to Remove Vertex Pixels

I made a classification mask of the layer and get the following figure: I got several vertex pixels. A vertex pixel is a pixel that attaches to a bigger group by just one vertex (shown in red circles)...
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57 views

Calculating the area of each county that has a specific land cover value (R or QGIS)

I need to calculate the area of each U.S. county that is covered by a specific type of land cover. I am using a county shapefile (polygons) and the land cover data is a raster that comes from the NLCD ...
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52 views

Plotting time series in QGIS

I have a shapefile with points, like this: x, y, id, data -1.3345,-0.4760, 1, data.csv The data.csv contains: date, data 2020-01-01, 1 2020-01-02, 2 2020-01-03, 3 2020-01-04, 4 How can I plot the ...
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29 views

Measuring the intensity of raster pixels within buffers

I need to create a variable ranging between 0 and 1 to compute the intensity of a flood. I have the raster file for the flood and the layer with the coordinates of the households that have been ...
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24 views

Translate to GTiff from NOAA nc file

I have level 2 of NOAA nc file. The data is in https://1drv.ms/u/s!AjXAWS5maHffhyqaxqd61ok-SFsY?e=mcUdnE. I want to open the file in QGIS or GRASS GIS. But, they don't recognize it. So, I use GDAL. I ...
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12 views

SIGABRT when calling QgsMeshLayer class (QGIS)

I am working on a C++ application that uses the QGIS API to overlay weather data from NetCDF files onto a KDE Marble map. I am using version 5.11.3 of Qt and 3.8 of QGIS on Fedora 28. When trying to ...
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42 views

QGIS Google satellite/aerial suddenly not displaying

QGIS 3.10 on Linux Mint 20. Just got back to work after the Christmas break and a QGIS project which was displaying Google aerials through XYZ tiles perfectly beforehand, is now blank. (as is Google ...
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21 views

Incorporate video and map in QGIS

I have videos with gps track (normally gpx file) and i need to put them together in the same final product, there in an add on "VIDEO UAV" in QGIS but it seems that he is not functioning ...
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1answer
30 views

How to change the extent of a similar raster in QGIS?

I have two MODIS evapotranspiration rasters and their information is given below. Desirable raster extents: Erratic raster extents: I want to change the erratic raster extent to desirable raster ...
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59 views

Shapefile has feature that I cannot edit on QGIS 3.10.13 on Windows 10

I am editing a map with multiple layers. The project includes a shapefile for buildings that has numerous rectangles in black with 100% transparency as a single symbol, The layer file is at the top of ...
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37 views

ERROR Cutline feature without a geometry

I am using QGIS 2.18.24. I'm trying to clip raster (asc) by mask (shp). I'm working in EPSG:4326. I'm checking the geometry of the polygon file, no errors were found. Geometry is valid. Edit mode is ...
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73 views

QGIS 3.16.1: Clip by mask layer not working in macOS Big SUR

I am having an issue with clipping my raster as per the vector mask layer. I did try to counter the issue with projecting both files in same CRS, however, still getting the same error (ERROR 1: ...
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44 views

Vector length attribute not the same after convert to raster in QGIS

In QGIS I've successfully used GRASS v.to.rast to convert a SHP file to a raster and then raster>conversion>BMP. My output looks great. The raster info says it is w = 3070, h = 8727. Unit is ...
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28 views

QField: Add and fill ring tool

When editing a polygon in QField, the polygon is highlighted in red. This makes it almost opaque and difficult to use the fill ring tool if digitising over a feature shown on the base map below. Is ...
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15 views

XYZTiles (MB) generator - how to erase “white tile” to have a lighter file

I work for resolve river quality problem I am trying to make a good basemap combining a lot of data from zoom 9 to 19. I'm using xyztile(MB) generator (jpg 75%) and to have a lighter file, I have a ...
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28 views

QGIS driving instructions predetermined route

I have a single line layer (a predetermined route), extracted vertices with distance, angle and added streetnames. I now want to add instructions (automated), like a regular sat nav would do. For ...
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36 views

QGIS labels moving after saving layer

I am using QGIS 2.18.20 on Win10. I am trying to manually move my labels, and I've followed the protocol from How can I connect label and point with a line/arrow?. I've used this protocol in another ...
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42 views

Raster and vector layer did not overlay with each other even in the same CRS

I am a newbie in the GIS world, I hope this community can help me to improve my skill. However, their coordinate is different how to change their coordinate to be in the same value? How can they have ...
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21 views

Alignment of raster files(.tif)

I have 5 different .tif files and all of them have the same bounding box(same starting and ending coordinates), but the number of rows/columns are different in each one of them. I want to make the ...
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24 views

Unable to download images in Semi-Automatic Classification Plugin (SCP)

I am using version 3.10, and I am trying to download images directly from the QGIS. The Semi-Automatic Classification Plugin (SCP) seems to work fine, I can find all the available images. However, ...
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36 views

Export layers to PDF

I have created a layer and using the category option have created lots of 'sub layers' is there a way to convert these to real layers so I can export each layer to a PDF?
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26 views

layer_styles table not available in QGIS 3.16, works in QGIS 3.10

Layer styles stored in a postgres database (postgres server version 9.5.22) are not available in QGIS 3.16 (Message from Database Styles Manager: No styles found in the database). Everything works ...
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20 views

Callout line positioning to polyline

I want to label multiple lines (segments) of a bike path. Every segment represents a part of the bike path which has a number and a specific measure assigned to it to meet the quality standards one ...
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21 views

Error code while downloading cloud free mosaic Sentinel-2 image in QGIS

I'm trying to create a composite image of 2 Sentinel-2 images to make it cloud free using the semi-automatic classification plugin on QGIS, but when I press 'run' in 'mosaic band sets' in the plugin I ...
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20 views

Convert contour shapefile to MicroStation dgn file in QGIS

I have a contour shapefile in QGIS with labels on (elevations for labels). I am able to convert it to MicroStation dgn file but the elevation labels of the contour shapefile are not converted with the ...
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11 views

Accuracy assessment after editing raster/misclassified pixels

I have a general question on Satellite imagery classification. There’s an edit raster option under the post-processing tool and in my study (change detection of mangrove), is it okay if I edit the ...
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45 views

Getting an error when using Natural neighbour (QGIS 3.16 Hannover)

I am having trouble with the following: For a project I need a topographic map with contour lines of a specific area. I've googled around and the only suitable option (without buying expensive ...
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34 views

LiDAR XYZ Data Cleaning

I have tons of LiDAR Bathymetric XYZ data of 5m resolution. Data has a lot of noise/spikes which takes ages to clean for a small area. I have tried using Fledermaus for 3D cleaning the data. Is there ...
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37 views

Semi-Automatic Image Classification Plugin error in Mac

I have recently added Semi-Automatic Image classification plugin in QGIS version 3.10 on my Mac (ver 10.14.6). I have gone through and followed each step advised in this stack exchange post while ...
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24 views

Have a common filter via GET variable for multiple GeoJSON layers in QGIS

I have a Leaflet page, that fetches various GPS tracks and data from a website and filters the resulting GeoJSON files via HTTP GET variables. If you want to get the data just for one day, I can use ...

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