GRASS GIS (Geographic Resources Analysis Support System) is a free, open source geographical information system (GIS) capable of handling raster, topological vector, image processing, and graphic data.
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contour lines from point shape attribute
I have a point shape file and one of the attribute refers to the altitude.
Is is possible to obtain a contour lines shape file in GRASS?
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SEXTANTE “could not load layer:…”
When I try to do a GRASS command via SEXTANTE in Qgis I always get the error:
"Could not load layer:...." check log file
Does not matter wether it should be saved in temp or another folder.
I found ...
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1answer
20 views
saga & grass configuration in sextante (ubuntu)
I have some trouble in running saga and grass algorithms in sextante. When I double click it appears a pop-up saying:
Missing dependency.This algorithm cannot be run :-(
This algorithm requires SAGA ...
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2answers
114 views
What's the relation between QGIS and GRASS?
I have been working with GIS and remote sensing in an university and professional environment some ten years ago (ArcInfo etc), so I have some experience even though somewhat outdated
Right now I am ...
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GRASS : probem changing mapset under windows
I have a known issue in GRASS when I want to change the mapset with g.mapset.
I get this error message : ERROR: Unable to read GIS_LOCK environment variable
I read that : ...
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3answers
97 views
How to clean layers from non topological databases?
I'm doing my internship in a consulting office which is switching from MapInfo to QGIS/GRASS 1.8.0.
I posted here a few days ago about the way to clean a polyline from a Lidar data with v.clean.
...
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2answers
59 views
How to resolve missing Python module (importlib) for GRASS/Sextante?
I have installed the nightly build of QGIS 1.9 from Larry's Dakota Cartography site, and have downloaded the latest Frameworks from William's Kyng Chaos site.
However, I am unable to install the ...
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1answer
95 views
How to repair and clean contours from high data resolution (lidar)?
I'm unsuccessfully trying to make a bathymetric map with contours extracted from Lidar data at 1 m resolution.
The extracted contours have a lot of artifacts like dangles and islands.
First I used ...
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33 views
r.regression.multi - ERROR: Not enough valid cells available
I am running a few analyses with r.regression.multi in Grass 7. For a few rasters that I try to correlate, the following error comes up, however: "ERROR: Not enough valid cells available".
I cannot ...
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1answer
49 views
How to get started with GRASS shell?
I'm a beginner in programming but i have to work with GRASS at work, and do it quickly.
I'm completely lost with all the variety of tutorials that are existing and to me, don't look the same...and ...
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2answers
51 views
GRASS: populating attribute table with specific values
I have a vector map that includes 100 points. These points were created using v.extract to randomly sample a larger map of 10k points. As such, the 'cat' values range from 1 to more than 10k. What ...
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1answer
29 views
GRASS: shift point locations in a random direction
I have a vector map that contains 100 points. For each point, I would like to shift it 250 units in a random location. It's easy enough to shift all points in a specified direction using
v.edit ...
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14 views
Problem opening GRASS GUI: libgeos-3.3.6.so: cannot open shared object file:
I have been using GRASS to process some Landsat imagery but very recently, and as far as I am aware - after having done nothing different or changing the settings, I am trying to use GRASS and on ...
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1answer
23 views
GRASS GIS: red square around node topology information?
I've been using GRASS since 2005, but I cannot find an explanation to the square boxes that appear around the nodes of a lines layers, when I display topological informations on the map.
I thought ...
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40 views
HELP! Starting up GRASS - Error messages.
I am just trying to start using GRASS, but am having problems setting up.
This is the error message I get:
WELCOME TO GRASS Version 6.4.2 2012
1) Have at your side all ...
