Category Archives: research tools

What if Google decides to discontinue Google Scholar?

Since Google discontinued Google reader I have always been wondering; what if they decide to stop with Google Scholar? If you are lucky enough to have access to an university library, you should be fine. But there are also a … Continue reading

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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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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 vector layers … Continue reading

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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 tools’ in ‘Vector’ menu.

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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. However, only r.random will respect the mask if set. 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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OpenGeoDa – cross-platform and open source

GeoDa has been around for a while. It is a great and user-friendly tools for spatial analysis. It was however only available for Windows. That was last time I looked (quite some time ago). I just checked out their website, … Continue reading

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JournalTOCs – a convenient way to follow your favorite journals

I just came across JournalTOCs. It is a website for, and I am quoting, “anyone who’s looking for the latest or most current papers published in the scholarly literature with international coverage”. It is a free service with a very … Continue reading

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Checking the analogies of known places

On the GRASS user email list, a new script for GRASS GIS was just announced; r.finder. The script can be used to check the analogies of places with known characteristics and to show the most similar areas in the region. … Continue reading

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Interesting list of mobile apps used in field work

A list of smartphone applications used in field work by ecology-l members:

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