Questions tagged [qgis-grass-plugin]

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11
votes
1answer
1k 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, ...
6
votes
2answers
3k views

How to clip raster in GRASS GIS?

I am using GRASS GIS 7.2.0. 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. How ...
5
votes
1answer
2k 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 ...
5
votes
2answers
4k views

Grass tools not working in QGIS 2.14.3-ESSEN, OSGEO4W [duplicate]

Windows 10 QGIS 2.14.3-ESSEN OSGEO4W install (current) 64-bit Processing toolbox. Grass tools do not work Neither 6 nor 7. 6 makes sense as I do not see OSGEO4W installing it but 7 tools are ...
5
votes
1answer
1k views

Cannot locate GRASS plugin in QGIS 2.14.1 on Linux

I am trying to load the GRASS plugin in QGIS but it is not shown in the plugin manager (no matter if I turn on experimental and deprecated plugins). Under processing / options / providers GRASS GIS 7 ...
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 ...
5
votes
1answer
1k 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
votes
2answers
7k views

How to activate GRASS GIS 7 plugin in QGIS 2.8?

Apparently, my linux ubuntu setup of QGIS doesn't contain grass gis, although when I initially installed it last week I added grass gis to the command line. Anyway, I typed in once again and installed ...
4
votes
2answers
4k 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/...
4
votes
1answer
6k views

Getting GRASS plugin working in QGIS for Windows?

I've installed QGIS 2.16.3-1 on Windows 10 via the OSGeo4W 64-bit installer and also selected the following packages: grass (7.0.5-1) qgis-grass-plugin7 (2.16.3-1) qgis-grass-plugin-common (2.16.3-1) ...
4
votes
1answer
103 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 ...
4
votes
0answers
138 views

Layers from GRASS db won't load in QGIS 2.18.4 desktop

I have been learning QGIS online but now I am stuck at a module. I am supposed to launch a project that includes GRASS vector and point layers. However, when I do so I always receive the 'Handle bad ...
3
votes
1answer
172 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 ...
3
votes
1answer
337 views

How do I set the GRASS_ADDON_BASE environment variable?

I am using QGIS and now GRASS GIS but I am not overly computer savvy. I am trying to add a GRASS modules (r.lfp) to my GRASS setup. I am on a Windows computer and can use the GRASS shell (I used to ...
3
votes
1answer
1k views

GRASS plugin missing from QGIS 2.14.3 Essen in Ubuntu 14.04

I had installed QGIS 2.14.0 (or .1 not sure) and I did some work with the GRASS plugin a couple of months ago, so it was there. I upgraded a couple of weeks ago to QGIS 2.14.3 and I was planning in ...
3
votes
1answer
121 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 ...
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 ...
3
votes
1answer
688 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 ...
3
votes
0answers
71 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 ...
3
votes
0answers
666 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: ...
3
votes
0answers
195 views

Using GRASS v.rast.stats: Rast stats layer not correctly generated

I want to use the GRASS tool v.rast.stats for extracting information from raster data. I need average, mean, number etc. for each of the 15 polygons. When I run the tool, following message appears at ...
2
votes
1answer
299 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 ...
2
votes
1answer
637 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?
2
votes
1answer
1k 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 ...
2
votes
1answer
227 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 (...
2
votes
1answer
308 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
1answer
817 views

'Add GRASS vector layer' button in QGIS 2.16.2 with GRASS 7.0.4? [duplicate]

I could not find 'Add GRASS vector layer' button in QGis 2.16.2 with GRASS 7.0.4? Can someone help?
2
votes
1answer
671 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 ...
2
votes
1answer
215 views

cannot start grass modules in gqis 2.14

When wanting to use the different modules in GRASS 7.2.1 I get this error. The version of qgis is 2.14.17 on 64 bit windows. I already checked that grass can find the right provider folder path. Who ...
2
votes
0answers
53 views

Using GRASS and v.split with QGIS

I have been working with QGIS for a few years now and am just now having issues with the GRASS module. Ultimately, I am just trying to split a line (river) into 100m segments, and have found the ...
2
votes
0answers
53 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 ...
2
votes
0answers
138 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 ...
2
votes
0answers
83 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
68 views

Generating ground control points with GRASS?

I want to find out matching ground control points in two images for auto georeferencing and grass manual says that i.points.auto will do the job. I am using Grass 7.2 but couldn't find this plugin.
2
votes
0answers
203 views

QGis 2.18 (and other tests on QGis 2.14) hangs with GRASS 7 editing session (OS Windows 8and 10)

I installed QGis 2.18 (64bit and 32bit versions) and i started a session with GRASS 7 in Windows 8 environment (the same thing I did on another workstation with Windows 10). I loaded a test layer with ...
1
vote
2answers
421 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
131 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 ...
1
vote
2answers
42 views

QGIS GUI showing nothing on loading a GRASS mapset

I have GRASS 7 plugin installed with QGIS 3.4.2. I downloaded the Alaska QGIS sample dataset and followed these steps to load the dataset into QGIS. When I expand the alaska location and load the ...
1
vote
1answer
121 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
622 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
225 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. ...
1
vote
1answer
77 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
1answer
167 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
16 views

QGIS Grass-plugin output does not match the CRS of input files nor project CRS

My project CRS and raster layer are EPSG:31467. However, when I use for example r.to.vect to create a polygon from the raster, the created vector layer has an unknown CRS and is a little bit off (does ...
1
vote
0answers
37 views

How do I split polygon into line segments?

My question exactly matches with this one : How do I split polygons into line segments? but the solution is outdated, I am not able to find v.type.bl option under the grass dropdown in QGIS 3.8. ...
1
vote
1answer
128 views

QGIS GRASS using v.drape FileNotFoundError: No such file or directory: '/usr/local/Cellar/osgeo-grass/7.6.1_5/grass76/etc/lock':

I'm running QGIS 3.8.3 and am trying to use v.drape. When I run it from the processing toolbox, I get a FileNotFoundError that's pointing to a strange /usr/local/Cellar/osgeo-grass.... folder. I'm ...
1
vote
0answers
86 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 ...
1
vote
0answers
12 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 ...
1
vote
0answers
25 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 ...
1
vote
0answers
56 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 ...