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Questions tagged [qgis]

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

5,585 questions with no upvoted or accepted answers
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Why does field calculator compute area in square meters?

I am using EPSG:102748, and have set my Settings/Option preferred measurement units to ft. My CRS is NAD_1983_StatePlane_Washington_North_FIPS_4601_Feet, and when I use the measure tool, it returns ...
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686 views

Error when using r.watershed in QGIS 2.10.1 with Grass

I am running r.watershed within QGIS processing the I get the error below. I draw your attention to: GRASS_INFO_WARNING(2205,1): Subprocess failed with exit code 256 GRASS_INFO_END(2205,1) Does ...
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How to select points as geometry in QGIS when both multipolygons and points are stated within the wfs-server?

I'm trying to show data from the following server in QGIS: http://geodata.nationaalgeoregister.nl/bag/wfs?service=WFS&request=GetCapabilities& I made a filter on the data I would like to ...
4
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1answer
456 views

Export two related layers to KML with multigeometry using QGIS?

From QGIS, I would like to create a KML file, for GoogleEarth, which contains multigeometry in that KML file. By example: consider two layers in QGIS -- the first layer contains polygons, and the ...
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954 views

Ubuntu 14.04 Another ImportError: No module named qgis.core

Issue I feel like this is covered territory here, but the issue is has appeared on two separate occasions for me--first when upgrading from Ubuntu 12.04 to 14.04 in May. I got it fixed then, but I ...
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63 views

QGIS is locking the clipboard from other application? (SitesPlus)

We are starting to use QGIS along with Sales Forecasting software Sites Plus by Gravitec. An ugly problem just popped up: Whenever QGIS is open, any attempts to calculate a data table in SitesPlus ...
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571 views

How to calculate percentages using QGIS field calculator expression?

I am new to QGIS. I am wanting to calculate a field using other fields and some operators. Here is my expression: case When "RVM_CAT" = 'B' OR "RVM_CAT" = 'C' Then ("PC1" /100) * "RE_ha" When "...
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443 views

Option for 360 degree movie embedded in Open Source GIS software?

Is there any Open Source GIS software available to embed 360 degree movies with the map? For a COTS example, there is the Active Link Vision (ALV) extension for ArcGIS from IWANE.
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756 views

Problem loading output layer QGIS

Every time I run operations with temporary file output from the graphical modeler, I get the following error message: Oooops! The following output layers could not be open CLIP: C:\Users\Amine\...
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1k views

How can I label the pie charts in QGIS so the labels are written under the diagrams?

How can I label the pie charts in QGIS so the labels are written under the diagrams? My pie-charts are representing localities: such as villages, towns, cities. So, I want that their names appear ...
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288 views

Launch Atlas composer generation from command line

I am using QGIS 2.2 and have configured a composer with atlas generation. I would like to launch this atlas generation every day. The idea is to write a batch and launch it with a cron. Is it ...
4
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1answer
476 views

How to set posgis default sequential value in a QGIS “editable” view?

Introduction In a QGIS project I have a VIEW, that I want to became editable (I'm trying to replicate the versioning system used DB Manager with some tweeks). Therefore I created a few rules to ...
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341 views

How to Simulate Venn Diagram of Buffers using QGIS?

For the sake of simplicity, suppose I have only 2 points on one layer. Point A have population of 100, and point B have population of 150. I do find buffer of these 2 points and it is intersect. I ...
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834 views

WFS feature caching in QGIS hitting feature limit

I am using QGIS 2 and using a WFS with a 5,000 feature limit. When I load a dataset without caching the features and it hits the 5,000 feature limit, QGIS seems to give up on reloading data. When I ...
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201 views

How to create a custom enterprise QGIS installer with plugins and symbols?

I am looking at installing QGIS at a company level. I would like my installer to install specific plugins, and add our company map symology. Are there any ways to do this? I have seen post about ...
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409 views

How to sort legend values efficiently in QGIS print composer?

Using QGIS 2.0, I have a vertical color legend for raster values, created in the print composer. I want the values sorted in descending order from top to bottom, which appears to be the reverse of the ...
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254 views

Is Dynamic Traffic Format supported by QGIS?

I have to merge (Dynamic Traffic FORMAT) DTF file into QGIS. This data is only available from NAVTEQ or TOM TOM. When I have searched ArcGIS network analysis tool, there is a clear option for adding a ...
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270 views

Spatial Precision for Editing in Multiple GIS Clients

I have something I'd like to discuss, I'll try to explain it first, why it's important, and I'll explain how ArcGIS handles the issue, which I think is a good way to handle it. Finally I'd like to ...
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589 views

How to create stacked bar/column charts in QGIS?

I know that conventional bar charts (with the bars adjacent to each other) based on feature attributes can be plotted in QGIS. But can you please tell me if there's any way to plot the bars in the ...
4
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Using QGIS with EPSG:404000

I'm using QGIS with a flat-world approximation dataset and for my specific use, geometric coordinates on a 1 unit = 1 metre scale are perfect. Unfortunately, QGIS doesn't have EPSG:404000 built-in, ...
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853 views

How to import PostGIS layer with geography type to QGIS?

I tried to import in QGIS a layer from a PostgreSQL table with a geography type column created through the extension PostGIS. I noticed that QGIS doesn't seem to like the geography column... Here ...
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5k views

problem with saving to esri file

I was using Wroclaw 1.7/GDAL 1.9(earlier release)/Grass 6.4/GSL 1.15-2 and started getting the following message when saving any item to esri format. "Export to vector file failed. Error: creation of ...
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603 views

How to set up a QGIS project in MVS 2008?

I have built QGIS using Visual Studio 2008. I would now like to start using the QGIS API for Windows Development. Of course I have Qt installed on Studio I hope correctly. I am new to Visual Studio ...
4
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1answer
997 views

QGIS GRASS Processing Not Working on MacOS?

Recently upgraded to QGIS3 (3.0.2) for MacOS (High Sierra) and encountered GRASS (7.2.2) issues. Tried adding a custom variable and now when running GRASS algorithms (e.g. r.reclass) I get the ...
4
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1answer
1k views

Counting and rasterizing polygon overlaps in QGIS?

I have a large number of polygons that are overlapping. I'd like to create a heat map and plan on using raster calculation to do this. My plan: to give each polygon a raster value of 1, and adding ...
3
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38 views

QGIS Join attribute by most similar lines

Using QGIS 3's (new?) Join attributes by nearest feature on two multiline layers, I get unexpected results... Namely, if a line crosses another, that is favored over one that is almost exactly the ...
3
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0answers
41 views

Multiple AND operators in CASE function in QGIS field calculator not returning results

I am trying to evaluate three attribute fields and return a different value. When I try this expression I get no return. CASE WHEN (Att_A =1) AND (Att_B = 2) AND (Att_C = 3) THEN 40 END When I try ...
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34 views

Easy way to close open clipped contours with the edges of the clipping mask?

I am trying to programmatically (with pyqgis) clip contour lines that I've generated in QGIS, but make it so that the clipping mask forms the new edges of the contours, rather than leaving the ...
3
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1answer
56 views

Changing degrees to meters

I'm using QGIS 3.4.9. When I try to create a heatmap the only radius option is degrees. Can you tell me how to change this to meters?
3
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1answer
39 views

Set geometry generator polygon to have flat end caps

I'm trying to buffer a line using Geometry Generator in QGIS (buffer($geometry,3)) However although I've set the Simple Fill join style to Miter I can't get the ends of the buffer to be flat. I ...
3
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1answer
37 views

Limit on Filter Query Stipulations?

I am novice mapper. I ran into some trouble with QGIS today when trying to add additional census tracts to a layer filter. The tract exists within the layer I'm filtering, but there seems to be a ...
3
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30 views

Changing Map Tip popup direction dynamically

Is there a way to dynamically (or semi-automatic) change direction of a popup? Default direction is 'right-down', which in some cases, where hovered feature is at the bottom of a canvas, Map Tip is ...
3
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0answers
37 views

Extracting the polygons from a multi-polygon shapefile where they intercept with points from a multipoint shapefile in QGIS

I have 2 shapefiles, one multi polygon shapefile (a) and and one multi-point shapefile (b). I would like to extract the polygons from (a) only where they contain points from (b). I can do this pretty ...
3
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36 views

Offset Expressions Dynamic QGIS - Unique non-repeating Numbers

I am trying to create a layer style that shows line features that share the same geometry, an exploded view for line Features. What I have done so far via the Offset expressions in QGIS 3.6 ("...
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53 views

No Vector Menu Available QGIS 3.4

I've installed QGIS 3.4 on my Mac. I don't have any vector or processing menu. In the "plugins" menu under settings, I have the following: "The settings on this tab are only applicable for Python ...
3
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1answer
67 views

Cleaning GPS tracks from large jump / outliers

Can someone please explain the steps to take in order to eliminate the parts of these linestrings which jump across large distances (not along with the road network)? They were created from GPS ...
3
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0answers
70 views

Error using 'Clip raster by mask' in QGIS v3.8.2

I am attempting to clip a raster to a shapefile boundary (country boundary, 1 polygon) using the 'clip raster by mask' tool in QGIS v3.8.2. Both layers are in WGS84, so projection mismatch shouldn't ...
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0answers
36 views

QGIS Transforming from ETRS89 to WGS84 - why are Helmert parameters 0?

If ETRS89 (EPSG:4258) is tectonically fixed and WGS84 (EPSG:4326) isn't, the Helmert coefficients shouldn't be zero, right? In fact these parameters should diverge more and more with every new release ...
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34 views

Problem with QGIS GDAL Fill Nodata

I have been using the 'GDAL Fill Nodata' function in QGIS in order to rectify downloaded Landsat 7 images, having created a relevant mask. Whilst said function has been successful in resolving bands 1 ...
3
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0answers
24 views

Batch Processing and Raster Calculators in QGIS

As of right now I have two sets of raster files. The first and second set are of differing sizes. I am attempting to use set to clip the other, using the process outlined in this question here Clip ...
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78 views

Refreshing QGIS project after updating MS Access Database?

I already connected the MS Access DB to QGIS via ODBC. Moreover, I applied the tool "create point layer from table" and I got all points from the DB (longitude/latitude coordinates) on my map. And ...
3
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0answers
48 views

Displaying QGIS's “Map Tips” in OpenLayers?

Still a little new to QGIS and Openlayers. How would you display QGIS's "Map Tips" into OpenLayers? I am currently using QGIS 2.18 and have the latest update in Openlayers. In QGIS, I have created a ...
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0answers
63 views

QGIS Value based arrows

Although i've seen some similar treads, I don't manage to quite solve my problem. I've added a delimited text layer that includes coordinates of 2 points. I want to make arrows between these points ...
3
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0answers
60 views

Get Isochrones for Public Transport in QGIS

I'm using QGIS and trying to get public transportation isochrones in Montreal for 20, 40, and 60 minutes. I was able to use the ORS plugin to do the same for cars, walking and cycling in the area. I ...
3
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0answers
45 views

Nearest neighbour joins for two geodataframes using KDtree from scipy/sklearn

I have a number of large geodataframes and want to automate the implementation of a Nearest Neighbour function using a KDtree for more efficient processing. The process I want to achieve here is to ...
3
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0answers
45 views

Setting input layers as PostGIS tables when building a model?

I am trying to build a QGIS 3.8 model where the same inputs are used each time and only the clipping layer extent changes. I can do this using shapefiles and editing the script to use the same input ...
3
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0answers
68 views

Exporting to QField from QGIS?

In creating an export from QGIS 3.8.0 Zanzibar to Qfield using the sync plugin, I am encountering a strange error. Each time I run the export, several of the layers I have in a geopackage in QGIS ...
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0answers
58 views

Removing noise selectively from DEM using QGIS?

I am looking for a processing tool that can remove noise selectively from a DEM (Mostly SRTM). My current workflow includes "Fill sinks" and "r.neighbours". The problem is that the tool is blind to ...
3
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0answers
25 views

Can I save a batch process as a default within a project?

I have a clip batch process saved as 'project-abc-clip.json' and would like it to be the default batch process for clipping when I open 'project-abc' The batch is project specific so I don't need or ...
3
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0answers
51 views

PyQgis 3 - Add New Layer to Spatialite Database

For the most part, working with QGIS layers has been a pleasure, but I've run into some difficulties recently when trying to create a new vector layer in the SQLite database I've been using. I've ...