Category Archives: GRASS GIS

GRASS gis scripts to import data from Worldclim, CSFR and PISM

Posted on April 9, 2013 by

I just came across these GRASS GIS scripts by Julien Seguinot to import multiple files from the WorldClim current climate dataset, the  Climate Forecast System Reanalysis (CSFR) data and some other reanalysis data sets. Furthermore, there is a script (r.in.pism) … Continue reading →

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Update of the r.forestfrag addon for GRASS GIS

Some time ago I came across this post from Sylla Consult about a script to calculate forest fragmentation index suggested by Riitters et al. (2000). Obviously, it can be used for any land cover type, so perhaps landscape fragmentation index … Continue reading →

Aside | Posted on February 16, 2013 by | Tagged , , , | 7 Comments

Presentation of map query result improved in GRASS 7.0

Posted on February 14, 2013 by

GRASS GIS (version 6.4, and up to recently 7.0 too) would present map query results in the command console. I have never really got used to it though. Often when I needed to query some points on the map, I … Continue reading →

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Import GRASS function console output as data.frame in R

Posted on January 23, 2013 by

In R you can use system calls or the spgrass6 package to run GRASS GIS functions. To do this, you need to run R from within GRASS GIS. This is as simple as starting GRASS GIS and subsequently starting R … Continue reading →

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Point coordinates to polygon – part II

Posted on January 17, 2013 by

In my previous article, I showed how you can convert point coordinates into a polygon vector layer in QGIS. So how about GRASS GIS? Like in my previous post, let’s assume you have a text file with two columns with … Continue reading →

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A quick look at the new GRASS Map Swipe Tool

Posted on January 7, 2013 by

I have just been trying out the new GRASS Map Swipe tool For now it is available in GRASS 7.0 but I understand it will be backported to GRASS 6 after some testing. The tool allows GRASS users to interactively … Continue reading →

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Sum up values of neighbouring polygons – a GRASS GIS approach

Posted on January 4, 2013 by

How to sum up values of neighbouring polygons in QGIS? This question was asked on gis.stackexchange, with two interesting answers. One answer explains how to use Spatialite and SQL to achieve this. The other answer, explained in more detail here, presents … Continue reading →

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New release candidate for GRASS 6.4.3 is out

Posted on December 21, 2012 by

The second release candidate of stable release 6.4.3 is available now. It contains a good number of improvements and especially stability fixes, see here for more details.

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Calculating the raster cell area of an unprojected raster layer

Posted on December 17, 2012 by

What if you get a raster layer with number of people per raster cell, like for example the population layer from Afripop,  and you want to convert it to a population density layer? Well, obviously, you need to divide the … Continue reading →

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Improved r.mask in GRASS GIS 7.0

Posted on December 16, 2012 by

I am mostly using GRASS GIS 7.0, which is the development version. Main reason I started to use this version was the better (faster) vector handling. But there are many other new features and improvements. And the developers keep on … Continue reading →

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