Category Archives: tools

Zotero 4.0 is out

Posted on April 24, 2013 by

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

Posted on March 8, 2013 by

A while back I wrote about two possible ways to export multiple layers in GIMP to one pdf file using third-party tools. But it turns out there is an much easier solution as Nevar pointed out in the comments on … 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 →

Aside | Posted on February 16, 2013 by | Tagged , , , | 7 Comments

Sharing or exporting sub-sections of a ZIM notebook

Posted on February 4, 2013 by

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

Posted on January 17, 2013 by

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 →

Posted in GIS, GRASS GIS, tools | Tagged , , , , , , | 2 Comments

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 →

Aside | Posted on December 27, 2012 by | Tagged , , , , , , | 2 Comments

Calculating the raster cell area of an unprojected raster layer

Posted on December 17, 2012 by

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

Posted on November 26, 2012 by

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

Posted on October 20, 2012 by

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

Posted on August 10, 2012 by

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 →

Posted in Data handling, tools | Tagged , , , , | 4 Comments