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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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Installing Google Earth on Ubuntu 13.10 64-bit
Google earth cannot be installed on Ubuntu 64-bit systems anymore. It requires the ia32-libs which is unfortunately deprecated in Ubuntu 13.10. Luckily I found a solution by mc4man on the Ubuntu...
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A new great version of QGIS
Are you one of those people eagerly waiting for all those new features in QGIS that have been mentioned in the last couple of months on various forums and blogs? Well, the waiting is (almost) over....
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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...
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Reverb makes it easy to find and download satellite data
If you need MODIS satellite data, you should check Nasa’s Reverb web portal. It is a, and I quote, “next generation metadata and service discovery tool”. But, as it turns out, is is already available...
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A quick list for one-click access to a list of often used xsetwacom settings
I just bought a small Wacom drawing tablet to use as alternative mouse and for my photo editing. According to the manual this tablets, like most on the market, are only compatible with Windows or OS X....
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GRASS 7.0 beta1 is out
After a long wait, GRASS 7.0 beta is out! See here a summary of what is new in this release. Take your time, is is a long list :-). In fact, GRASS 7.0 has been available for some time now … Continue...
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Add multiple raster or vector map layers to current map display in GRASS GIS
If your mapset contains many raster or vector layers GRASS offers a very handy feature to quickly select the layers you want to add to your current map display. In the layer manager, click Ctrl+Shift+L...
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A new method and tool (ExDet) to evaluate novelty environmental conditions
A common objective of correlative species distribution model is to be able to project the potential distribution of the target species into a new environmental space. This can be a new geographic space...
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Saving layer styles to your Spatialite database
Just discovered this option in QGIS to save styles for Spatialite layers to the Spatialite database. I don’t know when this option was introduced (I am running the development version at the moment),...
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One of those handy GRASS GIS functions I didn’t know about
Recently I needed to create a series of temporally interpolated rasters in between two input raster maps, viz., a suitability distribution map under climate conditions in 2000 and under projected...
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Creating a raster layer with a weighted random sample of points (or, my first...
I needed to create a raster map layer with a weighted random sample of all raster cells, using the percentage of crop land as weight. I couldn’t find a function to create such a weighted sample, so I...
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LibreOffice global menubar still not working properly in Ubuntu 12.10
I upgraded to Ubuntu 12.10 Quantal Quetzal about two weeks ago. As usual, there are a number of new or improved features and changes, the arguably most controversial being the Dash’s Amazon...
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Opening MODIS tiles in QGIS
NASA offers a very convenient web-based tool to select and download the tiles you need; Reverb / ECHO. The tiles are in HDF format and use the Sinusoidal grid tiling system (proj4 definition:...
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Reading GRASS GIS vector attribute tables into R
Linking GRASS GIS and R will give you a very powerful set of geo-spatial analytical tools. The spgrass6 offers a very convenient interface between GRASS GIS and R. You can read more about this package...
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Converting an ArcMap layer file into an SLD document
Most open source GIS programs can open all most common, and quite a few obscure data format (thanks to the gdal library). What they can’t open is the ArcMap layer files (.lyr). A layer file defines...
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New GRASS GIS Web Site
The GRASS GIS web team has created a whole new website. The goal was to create a simplified structure, general update and nicer experience. And they certainly succeeded, it looks great! And navigating...
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Multivariate Environmental Similarity Surfaces (MESS) index in GRASS GIS
The Multivariate Environmental Similarity Surfaces (MESS) is an index that represents how similar a point in space is to a reference set of points, with respect to a set of predictor variables (Elith...
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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...
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Spatialite 4.0 is out
The release of Spatialite 4.0 was just announced on the Spatialite user group. You can download it from the Spatialite website. And while you are on the website, check out the page about switching to...
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