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GRASS 7.0 beta1 is out
After a long wait, GRASS 7.0 beta is out! See here a summary of what is new in this release. Take your time, is is a long list :-). In fact, GRASS 7.0 has been available for some time now for those...
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Add multiple raster or vector map layers to current map display in GRASS GIS
If your mapset contains many raster or vector layers GRASS offers a very handy feature to quickly select the layers you want to add to your current map display. In the layer manager, click Ctrl+Shift+L...
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A new method and tool (ExDet) to evaluate novelty environmental conditions
A common objective of correlative species distribution model is to be able to project the potential distribution of the target species into a new environmental space. This can be a new geographic space...
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Saving layer styles to your Spatialite database
Just discovered this option in QGIS to save styles for Spatialite layers to the Spatialite database. I don’t know when this option was introduced (I am running the development version at the moment),...
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One of those handy GRASS GIS functions I didn’t know about
Recently I needed to create a series of temporally interpolated rasters in between two input raster maps, viz., a suitability distribution map under climate conditions in 2000 and under projected...
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Creating a raster layer with a weighted random sample of points (or, my first...
I needed to create a raster map layer with a weighted random sample of all raster cells, using the percentage of crop land as weight. I couldn’t find a function to create such a weighted sample, so I...
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A Zim-wiki export template for a adaptive website
I wrote before about Zim, a graphical text editor used to maintain a collection of wiki pages. Although mostly aimed at individual use, notebooks can also be shared as html files (and a few other...
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A new search engine to search the R documentation
Just to quickly share this great new website where you can search the documentation of all R packages and functions available on CRAN (6688 R packages and 136342 R functions at the moment of writing!)....
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Installing Google Earth on Ubuntu 14.04
Since Ubuntu 13.10 Google earth cannot be installed out of the box on Ubuntu 64-bit systems because it requires the deprecated ia32-libs package. The previous solution I wrote about, for Ubuntu 13.10,...
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Using GDAL from within QGIS: trouble shooting
Some notes to self about steps I had to take to make GDAL work from within QGIS. Both where compiled from source and run without problems. However, there are still a few issues with running gdal from...
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Stable GRASS GIS 6.4.4 released
A new stable version GRASS GIS 6.4.4 has been released. It sports various bug fixes and a number of new features. Go here for more information. You may be aware that there is also a GRASS GIS version...
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QGIS 2.4 is out
Just a few days after the release of GRASS GIS 6.4.4, now the latest and greatest QGIS Chugiak. And this new version comes with a whole bunch of improvements and new features. Check out this nice...
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Sampling raster values at point locations in QGIS – an update
In a by now fairly old post I described how to sample raster values at point location in QGIS. The method I described used the ‘Point Sampling Tool’ addon. However, the function creates a new point...
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Spatialite 4.0 is out
The release of Spatialite 4.0 was just announced on the Spatialite user group. You can download it from the Spatialite website. And while you are on the website, check out the page about switching to...
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Stratified random sampling in GRASS GIS
There are various options to create a vector or raster layers with random sample points, including v.random, r.random and r.random.cells. The first two generate random points within the defined region....
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Stratified random sampling in QGIS
In my previous post I described how you can create a random stratified sampling using GRASS GIS. Unlike in GRASS GIS however, QGIS has a dedicated tool to do this. You can find it under ‘research...
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Import MODIS data in GRASS using r.in.gdal
NASA offers access to its MODIS and ASTER data sets through Reverb|Echo. The data comes in HDF format and uses the Sinusoidal grid tiling system. If your gdal is compiled with HDF4 support (use...
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Check out the new Landcover Polygon overlay function in the LecoS QGIS plugin
The author of the QGIS plugin LecoS came up with a new feature which might come in handy for some of you: a polygon overlay tool. This tool can extract raster values and save them directly to the...
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Improved r.mask in GRASS GIS 7.0
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...
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Calculating the raster cell area of an unprojected raster layer
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...
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