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Category Archives: GIS software
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 need to divide the … Continue reading
Posted in GIS, GIS software, GRASS GIS, research tools, tools
Tagged GRASS GIS, R, raster, surface area
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Integrating Maxent, R and GRASS GIS
The maximum-entropy (Maxent) methods is one of the most widely used approaches for species habitat modelling. It has its own dedicated software, the Maxent software (written in java and therefore cross-platform). The software is easy to use and includes fairly … Continue reading
New library to extract OSM data
A quick note to myself (and whoever is interested ) Markus Neteler mentioned on the GRASS user mailing list a new library that came out that extracts valid data from within an OpenStreetMap input file. It is from the developer … Continue reading
New “Control Rendering Order” Option in QGIS
I just installed the latest QGIS development version (build 1.9.90-Alpha), and one of the changes I noticed was the option “Control rendering order” in the layers pane. I had to Google to check out what this new option was about. … Continue reading
Posted in GIS, GIS software, QGIS
Tagged GIS, map legend, maps, open source, QGIS, QGIS 1.9
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QGIS on my android phone
I mentioned before that QGIS was being ported to Android. I couldn’t try it out at the time as my phone was still running on Android 2.2. However, I just managed to upgrade my phone to Android 2.3 and of … Continue reading
Create wld file for map image
It is easy to export a raster file as a georeferenced images with e.g., GRASS, QGIS or gdal. It becomes more complicated if you want to export a map, composed of different layers. In QGIS, you can create very nice … Continue reading
Linking a lookup table to your vector layer
I was looking for a way to link an attribute table of a vector layer to a look up table, with a one to many relation. As discussed here and here, this does not seem to be possible in QGIS. … Continue reading
Posted in Data handling, GIS, GIS software
Tagged attribute table, gvSIG, lookup table, one-to-many link, QGIS
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QGIS Android works! @ GIS and Web Tricks
I haven’t tried this out, but the title of this blog article looks promosing. http://www.bernawebdesign.ch/byteblog/2011/08/21/qgis-android-works-2/
New version of QGIS out
The latest and greatest of QGIS is out, version 1.7. A lot of new functionality and improvements, check out the release notes here or download it directly from here.
