Questions tagged [qgis-grass-plugin]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
0answers
67 views

QGIS GRASS plugin not found?

I have seen this question come up before and have tried the related fixes as best as I could but nothing seems to work. I am running the most recent LTR of QGIS, 3.4.8 but my GRASS plugin cannot be ...
1
vote
0answers
30 views

GRASS r.sun returns “ERROR: insol_time and incidout are incompatible options”

I'm trying to measure irradiance on a DEM using the r.sun tool in QGIS 3.6. I have grids for the elevation (EPSG:32735 - WGS 84 / UTM zone 35S), the slope and aspect (EPSG:4326 - WGS 84). I've tried ...
0
votes
0answers
8 views

Inner workings of GRASS reclassification on QGIS. How does it work with multiband rasters?

I have a 33 band raster layer I need to reclassify. I tried using GRASS module inside QGIS and it worked out fine, except that it outputs a raster with a single band. Which band of the 33 did it ...
3
votes
1answer
64 views

Find radius of curve?

Using QGIS with GRASS I have found a route through r.drain but it has many sharp curve. the maximum radius of curve allowed to me is 176m. Is there any to reduce the curve sharpness to 176m or at ...
0
votes
0answers
21 views

i.pansharpen does not work

Running Grass 7 plugin inside QGIS 2.18 on a mac OS 10.14.2. Trying to perform pansharpening on landsat 8 imagery. Algorithm i.pansharpen - Image fusion algorithms to sharpen multispectral with high-...
2
votes
1answer
254 views

GRASS not working in QGIS, standalone

*Running QGIS 3.6, GRASS 7.6; have both Python 2 and 3 I'm trying to run a GRASS algorithm in QGIS, and none of the GRASS tools are working. GRASS also isn't working in the standalone version. I have ...
2
votes
0answers
38 views

Do I need the standalone GRASS app if I have the GRASS Plugin and Processing toolbox enabled in QGIS? [closed]

What processing abilities does the standalone GRASS GIS application have that aren't available in the QGIS GRASS plugin/toolbox? I'm trying to understand whether you would need/want the standalone ...
0
votes
0answers
65 views

GRASS function “V.net.centrality” Error env: python3: No such file or directory

I am using QGIS 3.4 (just updated) on a Mac OSX Mojave 10.14. I am trying to use the grass function "v.net.centrality" but I keep getting an error. The error is ... env: python3: No such file or ...
0
votes
1answer
194 views

r.series - no output 'ERROR 6: SetColorTable() only supported for Byte or UInt16 bands in TIFF format.!

Using grass tool 'r.series' (average of 2 raster files) with QGIS 2.18.28 works correctly. If I use this tool in QGIS 3.4.4 I get an error message: Processing algorithm… Algorithm 'r.series' ...
2
votes
1answer
77 views

Deleting floating lines from network using GRASS 7 in QGIS

I'm trying to find a way to remove floating line segments from a road network shapefile. Is there a relatively fast way to identify and delete these features? I've been using GRASS 7 in QGIS to ...
1
vote
1answer
89 views

Adding GRASS module to QGIS 2.18.21

I did a module in grass wich I called r.out.haralickFeatures.py. I did a .qgm. I can't get the parameters rigth. #!/usr/bin/env python #%module #% description: Compute asm, contrast, var, idm and ...
0
votes
0answers
53 views

Slope rasters - different results from different tools

I'm calculating Least Cost Path (LCP) within QGIS 2.18. The first step is to produce the slope raster from the DEM. Using r.slope in GRASS produces excellent results where I can go on and finally ...
0
votes
1answer
116 views

r.mapcalculator

I am using QGIS 2.18.25. I'm struggling to use r.mapcalc to calculate the ndvi for a workbook project. R.mapcalculator is shown on the workbook I'm using and seems simpler to use. Is there a plug-in ...
0
votes
0answers
146 views

Distance calculation with v.net.path in QGIS 3.2

I have 3 layers: origin and destination point shapefiles and network line shapefiles. I want to calculate the shortest path on the network between the origin (250 features) and destinations (20 ...
1
vote
0answers
22 views

Building graphs between two point layers

I am trying to run a script to find the shortest routes between two sets of point layers (Blue star and Green dots) in QGIS using road network. I am able to use GRASS gis "v.net.distance" for 1 star ...
4
votes
1answer
863 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 ...
0
votes
1answer
63 views

Error - Grass 7 doesn´t run because isn´t not sucessfully installed

I am having problems to run GRASS7 from the processing tool. Always run the following error that is not corrected instaled. I ve reinstall QGIS several times, even tried different versions,as also ...
1
vote
0answers
41 views

Working with GRASS gis in pyQGIS

I am looking for a way to loop through GRASS gis v.net.distance in QGIS. I want to iterate over all the 3 layers which has multiple features at the same time, and print the shortest distance for each ...
2
votes
2answers
1k views

GRASS GIS Plugin not loading in QGIS 3

When starting up QGIS 3.2.2 (also tested with 3.2.3), I get the following message in the "Plugins" Log Message Window: 2018-10-18T08:03:48 WARNING Failed to load C:/OSGEO4~1/apps/qgis/plugins/...
5
votes
1answer
1k views

Getting log error about default locale settings when using GRASS with QGIS?

I downloaded python 3.6, installed it, dowloaded QGIS 3.0.2, installed GDAL, then QGIS, then opened QGIS and tried to use GRASS processing tools. Initially I got the following error: env: python3: No ...
2
votes
1answer
211 views

GRASS in QGIS - ' Cannot read raster map region' (running r.lake.xy)

I want to use the GRASS function r.lake.xy on a DEM that I have. I load the DEM raster into QGIS, it is not georeferenced. Then I create a New Mapset. I set Projection Not defined. I either leave the ...
2
votes
0answers
70 views

No attribute table or values in QGIS 3.2 Grass toolbox plugin output files

Using the Grass toolbox within QGIS 3.2 (and previously 3.0) when I import any files and overlay them, then use the "View Output" option (button), the resulting file has the correct polygon areas ...
2
votes
0answers
74 views

r.series GRASS algorithm in QGIS 3.2 output no-data image

I'm trying without success to calculate a standard deviation image from 4 input images. I already used the r.serie algorithm in 2.18 to calculate an averaged image. Know after upgrading to 3.2.2 on ...
1
vote
1answer
86 views

Grass averaging raster not working with: Could not read georeferenced file error

I am trying to average geotiff using grass files using r.external and r.series. The geotiffs are georeferenced with wgs84. The command is below. grass74 g.proj -c proj4="+proj=longlat +datum=WGS84 +...
1
vote
1answer
491 views

GRASS 7.4.1 in QGIS 2.18

I am a new user to QGIS and GRASS. I want to use v.centerline so I opened GRASS as administrator on Windows 10 and I went to the gui of g.extension and successfully installed v.centerline. I opened ...
1
vote
1answer
243 views

Find distance between point layer and lines layer in QGIS?

All the answers were for one point and one line, But I'm talking about one point and multiple lines, and for older versions of QGIS. I have two shapefiles including one point layer and multiple lines ...
1
vote
0answers
61 views

Can't get GRASS 7 V.kernel.vector to work on QGIS 2.18.14

I have reinstalled GRASS multiple times, with all of the necessary listed programmes to install beforehand (e.g. GDAL), and it won't work. The error comes up - GRASS was not found in '/Users/Shared/...
1
vote
2answers
299 views

v.in.dxf not working properly in GRASS toolbox in QGIS 2.18.11

I am using the GRASS v.in.dxf tool from the GRASS plugin to import some contours in QGIS. Everything seems fine, but the tool does not import all the contours. There are no additional options in this ...
1
vote
1answer
218 views

QGIS GRASS error

I just installed QGIS 3 (after trashing the QGIS 2 app) on my macOS High Sierra. The application has been working well besides this error message that comes up when I try to use certain GRASS modules. ...
2
votes
1answer
670 views

How does “Minimum Size of Exterior Watershed Basin” work in r.watershed command in qgis 2.18.12?

I have delineated the watersheds from DEM using r.watershed command. I have specified the Minimum Size of Exterior Watershed Basin as 1500. I have read the description of r.watershed as well. I am not ...
4
votes
1answer
3k views

How to clip raster in GRASS Gis?

I am using GRASS GIS v7.2.0. The intent is to clip my DEM raster. I have searched available raster tools but didn't found anything allow me to clip my raster using polygon vector or interactively. ...
1
vote
0answers
95 views

solve Topology error in Grass using QGIS?

I want to build a raster from a vector layer by using "v.to.raster.attributes" in QGIS but its not working and give me an error to build a topology using v.build. I build it but after that i have no ...
3
votes
0answers
63 views

How to determine Kc value and apply it to r.sun?

As outlined in this link ( r.sun delievering unrealistic Values ) to get realistic values of kilowatt / meter-2, you must multiply the results by a "clear sky factor (Kc)". The link comments recommend ...
1
vote
1answer
161 views

Imported Shapefile layer doesn't show up in GRASS v.net dialog

I am using the GRASS interface in QGIS 2.4. I have successfully imported my shapefiles into GRASS using v.in.ogr, but when I try to then use a GRASS tool, like v.net Network maintenance, the select ...
1
vote
0answers
39 views

Error “std::exception” in GRASS GIS via QGIS

Does anyone know what this error means? I am using the GRASS GIS plugin in QGIS and I have imported a road layer (vector) using v.in.ogr.
4
votes
1answer
1k views

Finding GRASS module after upgrading QGIS (Mac)?

I upgraded from QGIS 2.10.1 PISA to QGIS 2.18 last week (via KyngChaos), and since then have not been able to run GRASS within QGIS - it appears not to be able to find the module. I had a look at ...
3
votes
0answers
355 views

Travelling Salesman in QGIS using GRASS

I would like to use the travelling salesman algorithm in the GRASS plugin in QGIS. I have a points layer (3 points) and a road layer. I have connected the 2 together using v.net and I am given this: ...
2
votes
1answer
412 views

r.water.outlet is returning blank raster in QGIS

I am Getting error "Ignoring point outside computation region: 77.0072,12.2529" while deliniating watershed using r.water.outlet in QGIS. What am i doing wrong?
1
vote
1answer
149 views

How to remove a map in QGIS GRASS Plugin

In QGIS Desktop 2.18.14 with GRASS 7.2.2, I started cleaning vector layers and it worked nicely. Issue: every time I load a shapefile onto GRASS Plugin by v.in.ogr (v.in.ogr.qgis), it creates a map (...
3
votes
2answers
2k views

QGIS 2.18 Windows 10, 32 bit system - where is the GRASS plugin?

I checked these question/answers already, but they did not address my issue: GRASS plugin missing from QGIS 2.14.3 Essen in Ubuntu 14.04 How do I get grass plugin working in QGIS for Windows? I am ...
1
vote
0answers
133 views

Using QGIS modules on Android Studio [closed]

I've been working on an Android app (using Android Studio 3.0) that utilises certain supported GRASS GIS modules that are available on QGIS. It uses the module in conjunction with open source raster ...
1
vote
0answers
79 views

Missing Grass Toolbox plugin running QGIS 2.18.13 [duplicate]

I am running QGIS 2.18.13 with Grass 7.2.2[1? ... can't remember which number was shown ... see comments below] installed via the OSGEO4W installer on both Windows 7 and Windows 10 (64bit). (I have ...
1
vote
0answers
68 views

qgis-grass-plugin7 problem updating 2.18.12 ->2.18.13 (win10-linux) [duplicate]

after updating qgis to 2.18.13 version (and GRASS from 7.2.1 to 7.2.2) via OSGeo4W advanced setup on win10 (and via repository on linux mint 18.1) the qgis-grass-plugin7 has disappeared from the list ...
0
votes
1answer
148 views

Grass toolbar for QGIS 2.14.18

The GRASS plugin toolbar appears incomplete in QGIS 2.14.18. I can open the mapset but I'm not finding how to load (open) an existing layer.
3
votes
1answer
145 views

QGIS Graphic Modeler not including all GRASS algorithms - How to include v.out.ogr?

I'm using QGIS 2.18,12 with the GRASS module 7.2.1 on Windows. When building a model in QGIS , I am not able to see all the algorithms possible under thr GRASS module, that are indeed available within ...
2
votes
1answer
221 views

PyQGIS GRASS r.reclass from Processing without result

I would like to reclass raster image with PyQGIS command from the Python Console. It runs without error but nothing is created. I have tried a lot of codes from here, but nothing is working. from ...
1
vote
1answer
68 views

Applying advanced parameter settings with RQGIS?

I am working on stream network delineation with GRASS 7 in RQGIS, the 'r.stream.extract' algorithm in particular. However, the algorithm returns erroneous result when the Advanced parameter, "v.out....
1
vote
0answers
82 views

GRASS within QGIS - can I access grass modules through shell?

I have QGIS/GRASS installation and I would like to do my process workflow through shell in Ubuntu. It is raster vectorisation -> selection by value -> saving as shp. I have done first step by gdal ...
11
votes
1answer
915 views

r.mapcalc does not give output in QGIS

For a while now I have been trying to use r.mapcalc from the QGIS Processing Toolbox. However, the algorithm does not give me any output. I have tried several raster layers and different expressions, ...
2
votes
1answer
451 views

How to know stream order in QGIS on output of r.stream.extract

I have stream order created over DEM using r.stream.extract , which gives 3 output files: stream_raster - raster map stores extracted streams. stream_vector - extracted points for each stream ...