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Category Archives: GIS
Rounding of floating numbers in GRASS GIS r.mapcalc
The GRASS GIS development team keeps on introducing new features and enhancements to GRASS 7.0. One of the latest examples is the enhancement of the round() function in r.mapcalc. Previously this function would always returns an integer, regardless of its … Continue reading
Building QGIS on Ubuntu 13.04
Always one of those dreaded moments after updating Ubuntu, to 13.04 this time. Will QGIS compile properly. Not as it turned out, but the solutions were easy and quick, thanks to posts on nyalldawson.net and boringnerdystuff. Ubuntu 13.04 defaults to … Continue reading
GRASS gis scripts to import data from Worldclim, CSFR and PISM
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
Some cool new features in the upcoming QGIS 2.0
The upcoming QGIS 2.0 will have some really cool and useful new features. Check for example out the latest blog posts by Anita Graser aka Underdark, where she takes you on a tour of all the new features of the … Continue reading
Posted in GIS, QGIS, Software release
Tagged blend modes, color blend, color control, map composer, new features
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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
Presentation of map query result improved in GRASS 7.0
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
Import GRASS function console output as data.frame in R
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
Posted in GIS, GRASS GIS, R computing environment
Tagged data I/O, function output, GRASS GIS, R, tutorial
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Point coordinates to polygon – part II
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
Posted in GIS, GRASS GIS, tools
Tagged GRASS GIS, kml, object type, point coordinates, point vector, polygon vector, vector layer
2 Comments
Point coordinates to polygon – part I
Articles about field studies sometimes (but not always unfortunately) contain coordinates delimiting the boundaries of the field study. What if you want to view those boundaries in e.g., Google Earth? In other words, how to create a polygon layer based … Continue reading
Posted in GIS, QGIS
Tagged delaunay triangulation, file csv, kml, object type, point vector, polygon vector, QGIS
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A quick look at the new GRASS Map Swipe Tool
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
