9 votes
Accepted

QGIS 2.14 standalone GRASS provider missing Msys folder, can't execute tools

I got the same problem using the Osgeo installer, but I just managed to solve it. First download this https://sourceforge.net/projects/mingw/?source=typ_redirect Install it, look for msys-base ...
user avatar
  • 106
7 votes
Accepted

How to activate GRASS GIS 7 plugin in QGIS 2.8?

GRASS 7 is not compatible with QGIS 2.8. You can follow the development of the new GRASS plugin on http://www.gissula.eu/qgis-grass-plugin-crowdfunding/progress.html. For 2.8, you will need to ...
user avatar
  • 82.1k
7 votes

How to sum a hundred of raster maps in GRASS GIS raster calculator

You should consider using r.series. Perhaps something as follows will work in your case: r.series input="`g.list pattern='arc_*' sep=,`" output=arc_sum method=sum
user avatar
  • 4,752
6 votes
Accepted

Unable to run v.clean in QGIS 3.0.1 in Python console

It appears that it was due to some bug I updated to latest version 3.0.2 of QGIS and modified processing.py to import QgsProcessingFeedback as follows from qgis.core import (QgsMessageLog, ...
user avatar
  • 1,534
5 votes

QGIS 2.14 standalone GRASS provider missing Msys folder, can't execute tools

So here's the deal: QGIS 2.14 standalone doesn't come with msys installation, but comes with grass 7 folders. QGIS 2.12 standalone comes with msys and grass 6.4 folders, yet no grass 7. The solution ...
user avatar
  • 8,217
5 votes
Accepted

GRASS r.in.lidar tool generates incomplete rasters

The inconsistency is caused by invalid points in the dataset. When I run (libLAS) lasinfo on the provided sample, I get: 1170966 Unclassified (1) 1565144 Ground (2) But when I execute: las2las -i ...
user avatar
5 votes
Accepted

How to restore a scarp surface grid to calculate material loss

I will try to address your question with GRASS. Your problem has a first task that is a bit challenging already, which is to get the situation before the event you want to quantify. I think the best ...
user avatar
  • 3,089
5 votes
Accepted

Correctly import .tif files in GRASS GIS

After importing the dataset into GRASS, you will need to complete two more steps. First, you should set the value of 0 to null. This can be done from the command-line as follows: r.null map=...
user avatar
  • 4,752
4 votes
Accepted

How to list the available GRASS modules in command line

There is a relatively new module g.search.module which lists modules based on keywords. Perhaps could be helpful for what you are trying to do. This module is so far in GRASS 7.1 only.
user avatar
  • 731
4 votes

Pygrass reading raster issue

The raster If your raster is not in a the current region, all the values are nan Therefore by security from grass.pygrass.gis.region import Region current = Region() current.align('aspect') Then ...
user avatar
  • 51.1k
4 votes

GRASS via Processing Toolbox doesn't work in QGIS 2.8.3 on Mac?

Why not upgrading your QGIS version? To know the GRASS path, you need to know how Processing really works. First, it is a Python module (processing) that uses subprocess to execute the original ...
user avatar
  • 51.1k
4 votes

GRASS 7 environment setup for Python

I use this export GISBASE="path_to_your GISBASE" export PYTHONPATH="${PYTHONPATH}:$GISBASE/etc/python/" export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$GISBASE/lib" export GIS_LOCK=$$ export GISRC="/...
user avatar
  • 51.1k
4 votes
Accepted

Connecting Python script external to Grass GIS 7 program in Windows 10?

The linked says you need to set environmental variables. This is done in Python using e.g.: import os os.environ['GISBASE'] = "/some/path" The syntax PYTHONPATH = 'C:\OSGeo4W\apps\grass\grass-7.0.4\...
user avatar
4 votes

How do I download and install r.denoise for GRASS GIS?

From the GRASS shell GRASS 7.1.svn (Geol):~ > g.extension r.denoise Fetching <r.denoise> from GRASS GIS Addons repository (be patient)... Compiling... Installing... Updating addons metadata ...
user avatar
  • 51.1k
4 votes

GRASS 7 tools in QGIS results in EPSG:3397 (PD/83 GK4) instead of 31468 (DHDN GK4) causing dislocation

EPSG:31468 and EPSG:3397 share the same projection parameters, but differ in the datum. The first has towgs84 parameters, while the second does not. Your output is a shapefile, and the shapefile ...
user avatar
  • 75k
4 votes
Accepted

Getting the 'memory:' layers after grass7:v.clean processing using PyQGIS?

Try replacing memory: with TEMPORARY_OUTPUT. The following code works for me which was executed on a polygon .gpkg file: hn_pg = iface.activeLayer() output = processing.runAndLoadResults( ...
user avatar
  • 72.3k
4 votes
Accepted

Field name for stats to be calculated not appearing using v.vect.stats

Area (ha) field is string because it is left aligned in the attribute table. You should convert into a numeric one. Open "Field Calculator" to create a new Area field. Select Decimal number (...
user avatar
3 votes

r.patch results in a blank map in GRASS

One suggestion would be to ensure that the computational region is correctly set, i.e.: g.region rast=tile1,tile2,tile3,...,tilen -p Then you should run the r.patch command: r.patch input=tile1,...
user avatar
  • 4,752
3 votes
Accepted

Is it possible to start the GRASS GUI from R?

Yes, it is possible to launch the GRASS GUI from R within a running GRASS session. It did not work because the environment variables where not correctly set. Modifiying the environment variables as ...
user avatar
  • 325
3 votes
Accepted

command r.stream.order not found in grass 7.0.3 how to install r.stream module?

Various r.stream.* modules must be installed as addons with g.extension. This must be done in GRASS explicitly, because g.extension seems not available via QGIS. see for details: https://grasswiki....
user avatar
3 votes

How to activate GRASS GIS 7 plugin in QGIS 2.8?

A late answer: QGIS 2.14 is compatible with GRASS 7 now. On Windows, the standalone installer provides separate icons for GRASS 7.0.3 integration. For GRASS 6.4.3 support, you have to stick to QGIS 2....
user avatar
  • 75k
3 votes
Accepted

GRASS 7 environment setup for Python

Once a python script is running, changes to environment variables are no longer effective. They are set up right before runtime and the interpretor will not update them afterwards. PYTHONPATH can be ...
user avatar
3 votes
Accepted

GRASS - Aligning grids of different rasters

I'll try to answer even though this was a few years ago. I suspect that the two rasters are misaligned because the GRASS region was slightly different when you imported the NDVI and LANDSCAPE rasters. ...
user avatar
3 votes
Accepted

Missing the results from grass tools when used in python console

If you're using GRASS 7, you will need to use grass7:v.buffer.distance instead of grass:v.buffer.distance. So try using the following: result = processing.runalg('grass7:v.buffer.distance', part1,'...
user avatar
  • 72.3k
3 votes

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

The GRASS plugin is available when you open QGIS Desktop with GRASS instead of QGIS Desktop.From the plugin then you can access GRASS.
user avatar
3 votes
Accepted

Grass projection issue

So researching for my issue I came across an old github repository filled with lectures on how to do a Supervised Classification https://github.com/FOSS4GAcademy/GST105FOSS4GLabs/blob/master/Module%...
user avatar
  • 439
3 votes

Qgis 2.18.1 text under a degree angle (Grass 7.0.5)

You can find the option in the layer's properties label tab, you need to check 'Label this layer' at the top and choose your name field, then: Layer properties -> 'label' tab -> 'placement' tab ...
user avatar
  • 23.9k
3 votes
Accepted

Issue with GRASS i.tasscap

It looks like you have not set the GRASS region correctly. After importing your data, you need to set the region to the extent and resolution of one of your bands, e.g.: g.region rast=B2 and then ...
user avatar
  • 4,752
3 votes
Accepted

Copying Grass data from one location to another in Grass GIS

Here an overview as it depends on the projection(s): When the projection is the same across the different locations, then you either can simply copy/move the respective mapset in location A to ...
user avatar
  • 12.6k
2 votes
Accepted

Problems to use v.what.vect in GRASS7

The problem is that the two features are not matching in the 3rd dimension! A quick look at the manual give the explanation: In case that one or both input vector maps are 3D, features need to ...
user avatar
  • 2,328

Only top scored, non community-wiki answers of a minimum length are eligible