Category Archives: tools

Zotero 4.0 is out

My reference manager of choice, Zotero, just released an update, Zotero 4.0, with loads of new functionality. For the highlights, see here.

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A plugin to export layers in GIMP file to single pdf file

Update: there is another plugin that export Layers to single multiple pages PDF. You can get the plugin here: http://registry.gimp.org/node/27987. I haven’t tried it yet, so I can’t tell you how it differs from the one described below. But of … Continue reading

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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

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Sharing or exporting sub-sections of a ZIM notebook

I use ZIM desktop wiki to keep all kind of notes. Sometimes I want to share my notes. This is easy enough when I want to share the whole notebook. I simply send the whole folder containing the ZIM notebook … Continue reading

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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

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Looking for a pdf reader with good annotations options

I read my articles on my (Android) tablet or on my computer (Ubuntu 12.10). On both, I want to be able to add notes and underline and highlight text.  For Android there are various apps that allow you to to … 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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Extracting lines ending with specific character using sed or grep

A quick note (to myself mostly) about how to extract lines from a text file that end with a specific set of characters. In Linux, you can very easily do this using ‘grep’ or ‘sed’. But, first a little bit … Continue reading

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A faster way to calculate MESS in R – or – a tribute to Stack overflow

Jean-Pierre Rossi introduced a function to calculate the “Multivariate Environmental Similarity Surfaces” in R. Since then, the function has become part of the dismo package, which is a package maintained by Robert J. Hijmans and which offers a whole lot of … Continue reading

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Publishing your Freeplane mindmap on the web

Freeplane is a great mind mapping software. I use it e.g., to jot down and organize notes from articles I am reading, creating lists of software, relevant websites, etc. One of the advantages of Freeplane is that you can export … Continue reading

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