Questions tagged [grass-7.0]

when GRASS 7.0 is the version you are using from the GRASS platform

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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 ...
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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 ...
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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 ...
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Error when running v.krige

I've been trying to get v.krige to run in the Grass7 command line, however, when I do so I get the following error: Error : .onAttach failed in attachNamespace() for 'rgrass7', details: call: if (...
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Missing list of algs in QGIS 2.14 Processing modeler?

I changed my QGIS-version from 2.8 to 2.14. I am very happy that v.net algs (grass7) are available now as part of the processing plugin. But now there is no list of algs inside the modeler - so no ...
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What does the blocking option do in GRASS r.watershed?

What does the blocking option do to the r.watershed program in grass? According to the manual, it should stop water from being routed past that location, but it appears to have no effect. I'm trying ...
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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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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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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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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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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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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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369 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 ...
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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 ...
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What does 'dither' mean in GRASS GIS?

What does the -d flag 'Dither' in GRASS GIS mean? For example in r.composite
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Installing r.denoise on GRASS GIS (Windows) doesn't work

I try to install the r.denoise add on for GRASS GIS on my Windows machine. If I start the installation without copying the html manual by hand, I get the errnr 2 that this manual can't be found. After ...
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Error in reading coordinates in GRASS module in QGIS

I am trying to split some lines using points as described here: http://osgeo-org.1560.x6.nabble.com/How-to-split-a-line-using-points-td4981464.html When I run the comands: v.out.ascii <my points&...
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Problem with sampling points vectors on r.sim.water Grass GIS

I'm trying to run r.sim.water on grass GIS. it works but i don’t get any result on the text file i saved on the variable "logfile". I have tried different vector point for sampling locations. Does the ...
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343 views

r. mapcalc error in grass gis 7

After upgrading to 7.0.4, I could not execute r.mapcalc perfectly, there is a problem : syntax error, unexpected INTEGER, expecting VARNAME or NAME Parse error ERROR: parse error ERROR: An error ...
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2 votes
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74 views

Grass Gis r.viewshed how i can set max distance in meter or kilometer?

I have a problem with the r.viewshed max distance wiki: "The value entered is in the same units as the cell size of the raster. " Work: I get one geo file and where I run a viewshed with ...
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154 views

Choosing diffusion coefficient and other parameters for r.sim.water in GRASS7?

I'm trying to run r.sim.water in GRASS7 to simulate overland flow during a heavy rain event. My DEM has a resolution of 1m. I prepared it by adding values for buildings and included ditches and ...
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227 views

GRASS GIS: how to run g.run_command("v.extract") in Python with sqlite, smooth-spline in GRASS GIS?

I would like to solve several problems by using a python script in GRASS GIS: I already uploaded collected GPS-waypoints and tracks ("v.in.org"), patched several GPS-vector data ("v.patch") and ...
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GRASS 7 r.sun aspect in doubt

I'm using r.sun in GRASS 7.0.3 to determine beam irradiance at a site (~ 56N -4W). I have a DEM (a local subset of EU-DEM). I'm using r.sun in mode 2, called from GUI. Typical logging in command ...
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Problems with python GRASS module setup outside GRASS

I currently have GRASS version 78 installed with my OSGEO4W. I am trying to utilize the boilerplate instructions here to call the GRASS module in my python script outside of the GRASS console (ie in ...
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What am I doing wrong with v.clean in QGIS 3.22 LTR?

I am trying to use v.clean to fix small overlaps and gaps in a polygon dataset. However, I always get an empty output. What am I doing wrong? I've tried different thresholds but the result is always ...
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1 vote
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157 views

r.sun GRASS GIS .. calculate sunhours for a specific coordinate pair

I am wondering if I can calculate the sunhours for a specific coordinate pair with r.sun on GRASS GIS. I want to give a coordinate pair as input and calculate how many sunhours there are on a specific ...
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48 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 ...
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248 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 ...
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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 ...
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Grass raster export to ArcMap 10.2

I need to export raster (results of r.walk and r.drain) to ArcMap for comparison. I did it on data from guatemala - WGS84, UTM16N as r.out.gdal and it works normally. But when I did this on Slovak ...
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Dissolve polygons from layer1 witch overlaps with polygons of layer2 using GRASS

I want to dissolve polygons from layer1 witch overlap with polygons of layer2 keeping attributes table of layer1 and using command line. What I've done : v.in.ogr -o input=original_plygons output=...
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123 views

GRASS r.volume Error

I am writing a Python script which uses a vector polygon outline to construct a raster map of a hypothetical 'mound'. Finally, the script will output the volume of this mound using r.volume. The ...
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124 views

GRASS-GIS i.pansharpen error code -11

I have been searching for similar problems however i did not find any that could fix my error. i have GRASSGIS 7.0 running on MACOSX El Capitan. No problems at all until i tried to run i.pansharpen ...
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1 vote
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71 views

NVIZ not installed/working?

I am running GRASS GIS 7.0.4 on Ubuntu 16.04. After completing a tutorial on extruding vector data, I tried running the nviz command to see the result in a 3D-view. This is in norwegian, but it ...
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1 vote
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42 views

GRASS r.stream* modules failing to install in Ubuntu

I tried to install several r.stream* modules within GRASS GIS 7.0.4, running under Ubuntu 14.04. Specifically, after trying to install r.stream.order from g.extension, output console returns "...
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1 answer
503 views

Error opening GRASS mapset in QGIS?

I have installed Grass 7.0.5 but I cannot open a mapset via QGIS 2.18. I receive this error message: Cannot open the mapset. Mapset lock failed (exitStatus=1, exitCode=0, errorCode=1, error=Process ...
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Working iteratively on GRASS in R environment

I would like to realize a bicubic spline for many shapefiles. Following the indications on this post,enter link description here I obtained my results and export it from GRASS to folder. Now, I would ...
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56 views

GDAL raster with python error: 'NoneType' when I use gdal.Warp

I'm trying to 'north-up' a georeferenced raster in a python environment, this is the code: from osgeo import gdal import numpy as np import matplotlib.pyplot as plt ds = gdal.Open(r"DJI_0895.TIF&...
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1 answer
174 views

Grass v.Centerline installation with "No Metadata Available" error

I have Grass 7.8.5 installed and I am trying install the v.centerline extension. I just get a warning with the following, and I see it hasn't installed when going to the Manage Extensions tool. (Mon ...
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77 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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375 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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  • 540
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How to write a command in shell script to install GRASS extension?

I have a script shell (UBUNTU 14.4) installing an environment for batch processing in PYTHON. It installs GRASS like this : echo ' installing PYTHON-GDAL ' echo '-------------------------------...
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  • 288
-3 votes
1 answer
106 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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