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Questions tagged [qgis]

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

5,848 questions with no upvoted or accepted answers
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44 views

Split Polygon to match length of lines with QGIS

I have a large polygon shapefile with many features (green), representing waterbody outlines, and a line shapefile (brown) representing river sections. I now want to split the polygon features into ...
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39 views

Coding of data font non editable in shapefile in QGIS

What is the reason for a shape layer to have the field "Codificación de la fuente de datos" (coding of data font) selectable or not? In the following image the red arrow shows the dropdown list in ...
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40 views

WFS filter encoding with multi word values in QGIS

I want to create a layer with WFS in QGIS, and filter out some objects with a filter encoding. My problem is that if I try to filter out based on a attribute value with two or more words in it, I get ...
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1answer
44 views

How can I turn editable a shapefile that has been previously saved filtered?

After describing this issue in Qgis: Shape layer turns non-editable if saved filtered (where the answer basically was "if you filter, don't edit"), it has happened again (filtering and editing ...
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49 views

Getting hazed figure when exporting a high resolution image in QGIS

I have a raster map made in QGIS. I am trying to export that map in .tiff format in high resolution (Somewhere around I can get a file of 300 MB). So I am exporting the image with a resolution of 960 ...
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2answers
175 views

Select multiple rasters from location

I have a lot of rasters (almost 4000) wich are representing individual glaciers in the Alps. I would like to select only the rasters located within the french border. As I have no information in the ...
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1answer
70 views

Display legend of WMS in layers panel in full extent

When loading a WMS layer from e.g. http://www.wms.nrw.de/geobasis/wms_nw_dgk5 the legend of the layer with larger desciptions is displayed in the layer panel not to its full extent (see picture). When ...
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1answer
142 views

Installing MOLUSCE plugin on linux? (Error reading metadata: general)

I am trying to install MOLUSCE plugin on ubuntu but every time i try i get an error message saying: The plugin is broken. Python said: Error Reading metadata: general There is a screenshot ...
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128 views

Getting fractional count of pixels in raster map using QGIS?

I have a raster map consisting of 22 land cover classes (LCC). Each pixel is 300 x 300 meters in dimension and contain one of the 22 LCC. I need to make 1 km x 1 km cells in the parent grid and count ...
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1answer
248 views

Automation of legal description( section - township- Range - Location)

Referring to the snap below, i want to automate the legal decription like W2NE, NENE, NWNE and so on... available inputs are Section, Township and Range info. I am using QGIS 2.8.3. I have so many ...
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127 views

Geocode Adresses with QGIS

I want to transform about 750 adresses into geocoded points. I´ve tried the plugins MMQGIS (Geocode) and Geopunt4Qgis but none of the things I´ve tried worked. Maybe its because the adresses are ...
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196 views

Create a combobox in qgis plugin to input text (string)

I'm developing a plugin in QGIS, with a dialog box where I want to insert text (string) and send to web service soap. I don't found much on the internet. Except this code that i have adapted: qid = ...
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101 views

Keeping my changes up to date with OSM

One year ago, we exported data from OpenStreetMap. We added attributes and cut some segments with JOSM. Now, we want to update those files (.osm) to the current state of OpenStreetMap. How can we ...
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71 views

Statistical analysis of polygons QGIS : find areas of statistical difference

I have polygons for the country divided into E.D. areas. These polygons illustrate the average annual rainfall in their ED area. Is there any way to statistically tell if one polygon area has a ...
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1answer
78 views

Install GRASS GIS extension r.pi including r.pi.prox and implement the Addon in QGIS

I would like to install the GRASS GIS addon r.pi within QGIS, I only have access to basic GRASS commands I installed QGIS using the osgeo4w-setup-x86_64.exe advanced installation using the http://...
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2answers
275 views

Calculating vegetation indexes with GDAL raster calculator?

I want to calculate a few of vegetation indexes [ example: NDPI (red band-green band)/(red band + green band)] in a model with the GDAL raster calculator but I don't know how put the equation here:
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135 views

Enable snapping options in QGIS-2.18 plugin using Python

I have a custom plugin to place point feature on another point feature. So i want to enable/activate snapping options before i place that feature in my QGIS application using python. So far i tried ...
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355 views

Converting shapefile data to .osm using ogr2osm

I've used ogr2osm command line tool to convert shapefile to .osm file while doing some editings in QGIS. The problem is after this convert, the updated OSM includes no feature and the attribute table ...
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76 views

Building a web-app/service compatible application with QGIS

I have been tasked with building an application that uses QGIS compatible geoprocessing libraries to do automated GIS tasks. The application should follow the criteria below: Coded in python Possible ...
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1answer
184 views

Highlighting an area of a map

I would like to have a borderline around a subset South-South(SS) part of the map (Map 1) (More like highlighting the subset part). I tried to clip a vector of the subset (map 2) to the entire map, ...
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30 views

v.surf.idw raster file conversion into a vector with same colours style

Is it possible to convert from raster to vector the raster file resulting from grass interpolation algorithm "v.surf.idw" coloured with the quantile method and maintain such colours in the vector file ...
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1answer
270 views

Understanding the app schema for using complex features in QGIS

I'm working with complex features on the GeoServer and the app schema extension. My understanding of the app-schema extension is that you are able to map complex features through a WFS at the end. ...
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2answers
99 views

Table with overlapping areas of 2 maps?

I have a base map with various land use. to this I have to superimpose a shape with the polylines that delimit the areas. How can I get the surfaces of each ground use that fall within each polyline?
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219 views

How to integrate a password-protected WMS layer into an OpenLayers GIS website without entering a separate password?

I'm building a small intranet site to display geodata easily. Using QGIS (2.18) and QGIS2WEB (2.34.0) I prepared geodata and created it as OpenLayers output as index.html. A WMS layer, which is ...
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198 views

Displaying a raster layer (Sentinel-2) MapServer/WMS

I have a lot of raster data Sentinel-2, I need to display them on the map with MapServer/WMS. when I saved the data as images through the QGIS, they were displayed correctly, because as much data I ...
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1answer
56 views

Categorized symbology inside categorized symbology

I want to make a complicated symbology for my layer. Now it's categorized on column use and I want to add a term "If use=street, different symbology to lamp_type column (H=(x),L=(y) and others=(z)" (...
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419 views

How to automate topology check/fix in QGIS?

Short version: I have a layer with 19483 features with plenty of topological errors and I would like to fix/review them as many as possible in an automated way but don't know how to do it. ...
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1answer
729 views

Cannot get Not Installed Plugins in QGIS 2.18

I tried looking for Not Installed plugins but they do not show up on QGIS version 2.18. Under Plugin Settings, QGIS official plugin repository is shown as unavailable. When reloading nothing happens. ...
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54 views

QGIS batch clip does not work. One by one it works fine

When using a batch clip QGIS gets stuck at some point giving me an unknown error, while just clipping one by one works just fine. Any idea what could be causing this? EDIT: log says: Uncaught error ...
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2answers
265 views

WMTS Error when adding Mapbox Layer to QGIS: Failed to download capabilities?

I've tried this a few different ways and can't quite get it to work using QGIS's add WMTS layer tool. The URL loads fine in a browser but won't download as a tile in QGIS. I don't have that good an ...
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106 views

QGIS georeferencer loses GeoTIFF attributes?

I used the georeferencer with QGIS 3.2 and I imported an image with the following EXIFS ExifTool Version Number : 11.09 File Name : Directory : ...
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46 views

Unwanted artefacts working with Raster analysis

I am trying to make a simple slope map from a DEM (tif). I already tried with the different slope-tools in QGIS (GDAL, SAGA, GRASS) and also the 3D Analyst in ArcMap. Boths bring the same result: a ...
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2answers
173 views

ImportPhotos generates Errors

I'm trying to get a layer with all my Photolocations. The Importphotos plug-in doesn't work. It just generates a ZeroDivisionError. line 338, in ok lat, lon = self.get_exif_location(tags, "lonlat"...
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2answers
541 views

Correlation between raster pixels within each polygon

I have two raster layers with the same extent, CRS, and resolution, and a shapefile consisting of a number of polygons. I would like to calculate the Pearson correlation between the two rasters within ...
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2answers
46 views

gdalwarp not clipping to index grid

I am using the 4 corners of a grid to clip a raster to it with gdalwarp with the following code: pkdumpogr -i index.shp -n left1 -n bottom1 -n right1 -n top1| while read Block_ID left1 bottom1 right1 ...
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46 views

Georeferencer in graphical modeler QGIS

Is it possible to automate georeferencing in graphical modeler, I want to extract images from a site and georeference them with QGIS. Graphical modeler algorithms won't show Georeferencer.
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499 views

AttributeError: Myclass instance has no attribute 'x'

I am trying to select a feature from the layer using my plugin. When working with my plugin in main Python function using QGIS, I receive an AttributeError when I call a class method from within the ...
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295 views

Drawing parallel lines in QGIS 2.18?

Is there a button in QGIS that will allow me to create parallel lines? I do not mean by using a script, or distance from. I usually use ArcMap, and in ArcMap you just begin editing, select parallel ...
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88 views

Coordinate background colour using Print composer in QGIS

How to add coordinate background in Print composer? Example in attached picture with coordinates, which is not quite visible.
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1answer
470 views

QGIS API 3.2 and PyQT5 in Ubuntu Fails: Native Qt signal is not callable

I'm trying to migrate from QGIS API 2.18 to 3.2 in Ubuntu18. Several changes are made, including the update from PyQT4 to PyQT5. This is the very beginning of my code: from qgis.core import ...
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110 views

Opening National Land Cover data?

How do I open the National Land Cover data in QGIS 3.0? Attached is an image of the files. It looks like it's an .rrd file.
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55 views

QGIS/PostGIS Difference Geoprocessing with tolerance

This is probably an extended question from my another question (Increase spatial query performance (st_difference)) This is the background is this. I have a road link and a tunnel link. From the road ...
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1answer
79 views

Recurring system crash while using GDAL Georeferencer in QGIS 2.18

I am currently working on aerial images I have to reference in QGIS. I usually use the GDAL tool for that, but during the last days, QGIS crashes all few minutes whenever I use it. I ran into this ...
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1answer
557 views

Points data to kml retain color

I have styled my point data with circle and red color symbology. Is there any way to retain the points color when saving layer to kml? Currently when saved and open in google earth, it only shows as a ...
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69 views

ArcPad 8.0 and Postgis Data - Viewing & Editing Problems!

I have data held on a postgis which I want to take out onto site to update. I exported data from Postgis using dB manager in QGIS 3 into a file which I then transferred it onto my tablet for site use....
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61 views

What geodetic reference system is QGIS using when providing latitude and longitude values for points using the field calculator?

When working in a projected map (project properties have a projection chosen), QGIS calculates longitude ($x) and latitude ($y) values for each point (or polygon centroid) as decimal degrees. (This is ...
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65 views

3D view of a thickness raster

I have a thickness raster and sediment core data (collected within the raster area in excel format). Is there any option to create a 3D view of a thickness raster incorporating with core length?
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295 views

Merging rasters in QGIS error

I have about 250 rasters (aerial imagery) to merge together in QGIS 3.2. Approx 4.5 gigs in size. What's the easiest way to merge them? I have tried to "merge" tool a lot but getting various errors ...
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1answer
253 views

SQL Server Geography Tables Not Connecting

This has me totally confused... it was working last week, isn't working now. Using QGIS v3.0 and 3.2 and no love. Even tried 2.18.21... no difference. Follow the pictures... This is my connection ...
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1answer
67 views

Add coordinates and id field into point shapefile in R/PyQGIS

I have a points shapefile with almost 1 million features. I would like to add three new attributes: y, x (coordinates) and an ID (integers from 1). How can I perform this task in R or PyQGIS? Using ...