Create new tables with subsets of your data using the Pivot table in LibreOffice

Just accidentally discovered this nifty feature in Calc of Libreoffice allowing to quickly create sub-sets of your data by double clicking on the row or column totals in a Pivot table. Continue reading “Create new tables with subsets of your data using the Pivot table in LibreOffice”


Changing file permission on host in Wubi

I have Ubuntu installed on my laptop using Wubi. Wubi is an easy way of installing Ubuntu next to your Windows. After installing you will have a dual boot system, where you have to choose at start-up between Windows and Ubuntu.

If you are running Ubuntu, you can still access your folders and files on your host (Windows). Look for the folder ‘host’ under your file system. One possible disadvantage is that file permissions are set to root. Continue reading “Changing file permission on host in Wubi”

Nice example of the use of geo-spatial tools in conservation and restoration planning

If you are interested in the use of GIS / spatial tools in the development and implementation of a management plan of conservation areas, have a look at Robert (GeoBob) Ford’s blog. It gives background information and ideas concerning the development of a GIS-based General Management Plan (GMP) for two national parks (Kundelungu and Upemba) in Congo. It is well written and clearly based on a lot of expertise. And for the visually inclined, there are a lot of very nice pictures too.


pack up your GRASS raster layer

What if you  want to get a number of raster maps from a mapset to bring with you? Or you want to back up a number of layers, but not the whole mapset? Of course you can export it as e.g., an ascii or geotiff, but that won’t save the colour table, attributes, etc. So what then? Well, check out the r.pack package. It provides a script that compresses a raster layer, including colour table etc.  You can restore the raster map from the export file to the same or another computer using the accompanying add-on r.unpack. Continue reading “pack up your GRASS raster layer”

Better winGRASS 7 with R-integration

If you are a Window user and are using or want to use R and GRASS in combination, you will be happy to by this announcement on the GFOSS blog that there is now a better integration of WinGRASS 7 and R.

This integration is available for Linux users for a very long time. It was actually one of the principle reasons I started to use Linux. But now Window users can enjoy the experience too :-). Further user instructions are given on the GRASS wiki.


Selecting multiple layers in the GRASS GIS layer manager

Selecting multiple layers in the GRASS GIS wypython layer manager has always been possible. But there wasn’t much point to it. You couldn’t do anything with the multiple selections, no zooming, removing nor setting the region for multiple layers. Trying to remove all selected layers for example would just remove the first of the list of selected layers.

This missing feature has always bugged me. But stupid enough, I have never taken the trouble to file a bug or feature request. Luckily somebody else did make the effort to file a feature request. And guess what, 36 hours after the ticked was opened, it has already been implemented! Pretty amazing I think. Continue reading “Selecting multiple layers in the GRASS GIS layer manager”