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Questions tagged [grass-7.0]

Use this tag when GRASS 7.0 is the version you are using from the GRASS platform.

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9 views

Cannot find Grass7 folder in QGIS 2.18 content folder

I have freshly re-installed QGIS 2.18.28 in the prescribed order. I was under the impression Grass7 in included in one of the install packages. But when trying to point QGIS to the grass7 folder under ...
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0answers
15 views

Points of drillhole data to 3D lines in GRASS

In GRASS 7.0 I have a 3D vector file which are several SPT drill holes, with the NSPT values at each interval. I was able to export these points to Paraview through "v.out.vtk -cn input = nspt_3D type ...
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1answer
28 views

d.rast.edit not yet implemented in the WxGUI

Am using GRASS to modify a raster and tried using d.rast.edit but am getting the following error when using it in the WxGUI Command 'd.rast.edit' not yet implemented in the WxGUI. Try adding it as a ...
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0answers
38 views

Unable to make use r.drain

I want to calculate a cost distance model between a source of raw material and a group of sites. Raster and vector data are in the same CRS (EPSG 32615). I was able to use r.walk and get my cost and ...
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0answers
41 views

GRASS GIS Shortest path: Limit on number of calculations?

I'm trying to compute the shortest path between about 10'000 location-pairs. I've prepared my vector map as described in the documentation. I can calculate shortest path on about 1'000 location pairs ...
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0answers
52 views

DLL error and 1073741511 error running GRASS from external Python script

I am struggling to run any GRASS 7.4.1 Session from outside using Python 2.7.15 with Spyder IDLE. While setting up the GRASS bin and GRASS environment are as follows are all good and showing no ...
1
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1answer
63 views

GRASS 7.4 addons look installed but not accessable

I'm tring to install the addon v.centerline using the GRASS GUI 'Fetch & install extension from GRASS Addons'. I get the following message saying it's installed yet it doesn't show up. I tried ...
1
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1answer
68 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 ...
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0answers
12 views

Using GRASS 'i.atcorr' tool for more number of bands

I am using GRASS 6.4.4 for atmospheric correction. Can any one suggest how to add a sensor which needs a new argument for i.atcorr other than arguments mentioned in GRASS GIS manual: i.atcorr. I have ...
2
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2answers
44 views

Creating precipitation raster map in GRASS GIS?

I am trying to create a potential erosion map of my basin for which I require a rainfall distribution map. I have 3 stations' rainfall data for the year 2007- 2015. How do I create a rainfall map in ...
0
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1answer
31 views

Entry point not found Error initiating GRASS GIS from Python

I cannot run any GRASS tools from within Python 2.7.15. While the GRASS environment, grass.script etc. are loading correctly and I can run basic checks like gscript.read_command('g.gisenv') gscript....
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1answer
28 views

Why doesn't wx graphical modeler Grass gis 7 work properly in Spanish?

I am working with the wx graphical modeler in grass gis 7. When I try to use a variable call "archivo" in spanish, wich is "file" in english, it does not work. The variable dont let me choose a file. ...
0
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1answer
83 views

correlation matrix and p-value in grass

I'd like to know if there is a way to obtain statistical significance and p-value for correlation coefficients calculated for different raster in grass with the command r.covar All that I obtain is ...
1
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1answer
416 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 ...
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0answers
21 views

Deleting multiple columns in vector attribute table selecting by wildcards in GRASS

I need to delete a series of columns of a vector attribute table inside GRASS before starting further processing. I know I can use v.db.dropcolumn map=vector@PERMANENT columns=col1,col2,col3 But if ...
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0answers
338 views

remove/fill gaps inside polygon qgis

I have created a polygon from grass gis and found small triangle like structure inside the polygon (sometimes at the edge to outside), that I want to remove/fill. I tried with geometry check to fix ...
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0answers
56 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/...
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1answer
92 views

Copying Grass data from one location to another in Grass GIS

I have created several Grass locations with single mapsets while processing a series of satellite imageries at different stages of my analysis. Now I need to copy some preprocessed rasters and ...
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0answers
82 views

r.stream.basin in qgis

I am trying to generate subbasin with provided multiple outlets points by using r.stream.basin. I have install r.stream.basin addon in grass but it does not appear in qgis. Is there any ways to use ...
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0answers
48 views

GRASS GIS - Entry point error for r.in.gdal

I am trying to run GRASS GIS 7.4.0 in Spyder (Python 2.7) - Windows 10 The simple code I am trying to run is as follows: import os import sys GISBASE = os.environ['GISBASE'] = 'C:\\Program Files\\...
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0answers
40 views

GRASS GIS Error Flags

I am attempting to run a GRASS command from the terminal and eventually a bash script, in which it links rasters in a folder to the Mapset previously defined. I was able to successfully create the ...
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0answers
21 views

Hyper spectral data atmospheric correction

Can any one suggest how to customize 6S vector version for Hyper spectral data.I am using grass6.4.4 (which is a scalar version)for atmopsheric correction of multi spectral data.I have not seen ...
5
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1answer
542 views

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

I am trying to use v.clean algorithm in QGIS 3 python console. Code is as follows. lyr = iface.activeLayer() new_layer = lyr.materialize(QgsFeatureRequest().setFilterFids(lyr....
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0answers
90 views

Adding 3rd party grass script into qgis processing toolbox on Mac? [closed]

I am trying to integrate this script http://www.mergili.at/randomwalk.php into QGIS on Mac, but I am having a few problems. I have already seen How to add my own GRASS algorithms to Processing? But ...
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0answers
59 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 ...
4
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2answers
108 views

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

GRASS 7 tools used from QGIS produce a result in a projection differing from the input projection which might lead to inconsistences: Example v.net.connect, input EPSG of both layers is 31468 (DHDN ...
0
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1answer
160 views

Fuzzify Slope Values

For a suitability analysis I need to define the suitability of slope from DEM values (in %) to build new trails. Knowledges says that flat and rather steep areas are not suitable due to water runoff. ...
3
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1answer
271 views

Correctly import .tif files in GRASS GIS

I am trying to import a GeoTiff (.tif) into GRASS GIS. I then want it to show up in the map display. This is the data I want to use: http://ghsl.jrc.ec.europa.eu/ghs_pop.php As far as I can tell, ...
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0answers
27 views

How to interpret v.kernel network results

v.kernel "Optionally generates a vector density map on a vector network." I have done this for a network, but I don't understand how to interpret the output of this. Can anyone explain this? I am ...
2
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1answer
24 views

Issue with GRASS i.tasscap

I'm trying to carry out Tasseled Cap Transformations in GRASS GIS. I have a Landsat 8 image with bands 2-7 that are needed for the calculation. I have imported the bands into GRASS and attempted to ...
5
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2answers
4k views

Updated: Fix for Polygon Self-intersection QGIS 2.18.14?

I am attempting to mask a raster to US Forest Service boundaries in QGIS. It fails due to self - intersections of polygons. Warning 1: Ring Self-intersection at or near point -109.90112962000001 43....
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0answers
184 views

How to properly calculate annual irradiance using QGIS

I want to calculate annual irradiance for a couple of buildings to establish how much PV energy can be potentially harvested. Which algorithm You recommend for this purpose: "r.sun" from GRASS ...
0
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1answer
72 views

standalone script using grass7:v.clean gives erro

I am writing a standalone script using QGIS processing plugins. everything works but after adding a new command it gives me some errors. The command is as folloing: processing.runalg("grass7:v.clean",...
1
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1answer
158 views

GrassGIS process for DTM of UAV point cloud [duplicate]

Using grassGIS I am attempting to produce a DTM (remove buildings and vegetation) from the las point cloud. Unfortunately the point cloud exported from dronedeploy.com does not distinguish first and ...
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0answers
140 views

How to use GRASS command “r.stream.distance” in Qgis 2.16.2?

I like to figure out the distance from each cell to the outlet along the flow path. Maybe you can suggest some other opportunities/commands to solve my problem. It would be nice, if someone can help ...
1
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1answer
158 views

Setting variable from input map in GRASS python script?

I'm currently working on a GRASS script that takes maps from user input and computes them into a mapcalc expression. The issue i'm stucked with that when i ask for the map i can't set a variable name ...
3
votes
2answers
634 views

How to restore a scarp surface grid to calculate material loss

I would like to calculate the volume of material lost from a scarp like the one shown in the following image: Is there a way to do these calculations with open-source software such as GMT, QGIS and ...
2
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0answers
273 views

Using SAGA and GRASS on macOS Sierra?

I am trying to run QGIS 2.18.13 on Mac OS Sierra (10.12.4), but I'm having problems with SAGA and GRASS, at least from processing. Here's what I did: Installed QGIS from brew, but ended up having ...
1
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1answer
105 views

GRASS 7.2.1 r.denoise/mdenoise error Windows 10

So I am trying to use the r.denoise add on in GRASS 7.2.1 to remove noise from a .dem elevation model. Initially when running the add on I received the error: ERROR: mdenoise required. Follow ...
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0answers
199 views

R.reclass Permission denied

I'm writing a script to treat some rasters. One of steps is a reclassification. So I use r.reclass from Grass. But unfortunately, it return a weird error message: IOError: [Errno 13] Permission denied:...
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0answers
71 views

r.out.xyz not working

I've got QGIS 2.8.1 - Wien on my system and often use the Grass tool r.out.xyz. Two of my colleagues have recently installed QGIS 2.18.12, which shows both Grass and Grass7 processing tools. Grass7 ...
0
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2answers
68 views

Use GRASS digitiser tools in QGIS

I have QGIS with GRASS 7. I'm looking for the old style GRASS digitising tools. Previously, when digitising boundaries, it was required to split any adjacent boundaries intended to be joined to. The ...
1
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1answer
1k views

rgrass7: Invalid number of 'breaks' for hist.default

So I just started to use the library rgrass7 from R and I got this error Error in hist.default(v, main = main, plot = plot, ...) : invalid number of 'breaks' Or, using the summary function, I ...
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0answers
38 views

Getting Error while installing grass extension

I want to install grass extension r.stream.order in my grass 7.But,while installing I am getting below error: g.extension -s extension=r.stream.distance url= Fetching ...
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1answer
64 views

GRASS executable in Shell with R

I was trying to write a shell script using GRASS commands and I realized that I wanted to use R commands in my code but I couldn't find a way to execute the Rscript using my results from the GRASS ...
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1answer
20 views

Working with Shell script and GRASS

So reading this GRASS/Shell documentation I decided to test my own for repeat using this lines CATS="(v.db.select -c map=training columns=cat)" echo $CATS for i in $CATS do where="cat = $CATS" ...
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0answers
42 views

Can't Link grass to remote server postgis topology schema for import or export vector data

I have installed postgre/postgis on a remote server in which i want add topology data from Grass Gis to postgre topology schema. Grass gis 7.2.1 is installed on another PC on the network which has ...
0
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2answers
240 views

First time using i.segment.uspo in GRASS

I am using the module i.segment.uspo in GRASS for the first time and I wanted to know if anyone here haws experience with that add-on in GRASS so I can get some hints on how to use it more efficiently,...
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0answers
323 views

How to activate GRASS 7 v2 in QGIS 2.18 on Mac

I have QGIS installed. I've ticked GRASS 7 in Plugins/Manage and Install plugins, but the Grass Tools options are all greyed out with No mapset is open reported. In the GRASS options the New Mapset ...
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1answer
58 views

Problem with supervised classification (using GRASS) [duplicate]

So I was playing with supervised classification with GRASS. The first issue that I ran into was right after the first two steps of classification (v.to.rast and i.gensig) which was: unable to read ...