Category Archives: GIS software

Rescale your raster data layer

Sometimes you want to rescale a raster layer, e.g., to reduce the number of categories, or to create a common scale for different raster layers. Very basic of course, so you can expect to find an appropriate function in any … Continue reading

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GRASS GIS 6.4.3 RC4 released

Good news, check it out: http://grass.osgeo.org/news/25/15/GRASS-GIS-6-4-3RC4-released/

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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 need to divide the … Continue reading

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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

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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

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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

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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

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QGIS Android works! @ GIS and Web Tricks

Seems pretty cool, now all I need is to upgrade my phone to Android 2.3 device because it won’t run on 2.2 or below: http://www.bernawebdesign.ch/byteblog/2011/08/21/qgis-android-works-2/

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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

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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

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