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Find Latitude and Longitude Values in Google Maps
Getting the coordinates of a location on Google maps isn’t as straight forwards as one may expect. But, as usual, if you know how, it is easy enough. And, there are actually several ways. What’s here?...
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Sum up values of neighbouring polygons – a GRASS GIS approach
How to sum up values of neighbouring polygons in QGIS? This question was asked on gis.stackexchange, with two interesting answers. One answer explains how to use Spatialite and SQL to achieve this. The...
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A quick look at the new GRASS Map Swipe Tool
I have just been trying out the new GRASS Map Swipe tool For now it is available in GRASS 7.0 but I understand it will be backported to GRASS 6 after some testing. The tool allows GRASS users to...
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Point coordinates to polygon – part I
Articles about field studies sometimes (but not always unfortunately) contain coordinates delimiting the boundaries of the field study. What if you want to view those boundaries in e.g., Google Earth?...
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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...
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Import GRASS function console output as data.frame in R
In R you can use system calls or the spgrass6 package to run GRASS GIS functions. To do this, you need to run R from within GRASS GIS. This is as simple as starting GRASS GIS and subsequently starting...
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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...
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Presentation of map query result improved in GRASS 7.0
GRASS GIS (version 6.4, and up to recently 7.0 too) would present map query results in the command console. I have never really got used to it though. Often when I needed to query some points on the...
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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,...
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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...
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Some cool new features in the upcoming QGIS 2.0
The upcoming QGIS 2.0 will have some really cool and useful new features. Check for example out the latest blog posts by Anita Graser aka Underdark, where she takes you on a tour of all the new...
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GRASS gis scripts to import data from Worldclim, CSFR and PISM
I just came across these GRASS GIS scripts by Julien Seguinot to import multiple files from the WorldClim current climate dataset, the Climate Forecast System Reanalysis (CSFR) data and some other...
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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...
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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.Filed under: Software release, tools Tagged: reference...
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Building QGIS on Ubuntu 13.04
Always one of those dreaded moments after updating Ubuntu, to 13.04 this time. Will QGIS compile properly. Not as it turned out, but the solutions were easy and quick, thanks to posts on...
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Rounding of floating numbers in GRASS GIS r.mapcalc
The GRASS GIS development team keeps on introducing new features and enhancements to GRASS 7.0. One of the latest examples is the enhancement of the round() function in r.mapcalc. Previously this...
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Sharing geotiff raster files
One of my favourite raster formats to share is the geotiff, mostly because I always thought it is one of the most portable formats. But yesterday I got an email from a colleague that the geotiffs I...
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The all new shiny QGIS 2.0 has arrived
And it is looking great. I have been using the master (development) version for some time now, so I can tell you out of experience that this release rocks! Some of my favourites are the greatly...
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Creating a QGIS color map from text file
I recently found the interesting USGS map of global ecosystems. The data can be viewed online but can also be downloaded as geotif files, which is great as about every GIS program on the planet can...
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QGIS auto-trace plugin
Last time I opened QGIS there was a notification that there was a new plugin; the auto-trace plugin. I just tried it out to see what it is all about. I must say, it is a pretty nifty tool. It …...
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