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New library to extract OSM data
A quick note to myself (and whoever is interested ) Markus Neteler mentioned on the GRASS user mailing list a new library that came out that extracts valid data from within an OpenStreetMap input file....
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Checking the analogies of known places
On the GRASS user email list, a new script for GRASS GIS was just announced; r.finder. The script can be used to check the analogies of places with known characteristics and to show the most similar...
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Check out this article ‘Let the four freedoms paradigm apply to ecology’ (but...
There is an interesting letter (Let the four freedoms paradigm apply to ecology) in Trends in Ecology and Evolution by Duccio Rocchini and Markus Neteler arguing that science should use open source...
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From attribute table to QGIS style file – step 1
I have a large number of GRASS vector layers with in the attribute table a RGB column defining the colours of the corresponding mapping units. Unfortunately, unlike GRASS, QGIS does not offer the...
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QGIS 1.8 “Lisboa” is out
The next version of QGIS has been released and ready for your enjoyment. See this link for more information about this release. Filed under: GIS, QGIS, Software release Tagged: QGIS, software release
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Cross tables in R, some ways to do it faster
In R to create a contingency table of the counts of the combination of two variables, I would normally resort to table(). But how fast is it? A question that becomes more relevant when working on large...
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From attribute table to QGIS style file – step 2
This post is a follow up on an earlier post where I described how to use a column with RGB values in an (attribute) table to create mapping symbols for QGIS. The next step is to create the qml legend …...
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JournalTOCs – a convenient way to follow your favorite journals
I just came across JournalTOCs. It is a website for, and I am quoting, “anyone who’s looking for the latest or most current papers published in the scholarly literature with international coverage”. It...
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Reprojecting your layer in Spatialite
I have a vector layer ‘nursery data’ in a Spatialite database. The coordinate reference system of the layer is WGS84 geodetic (EPSG 4326). What if I need to reproject the layer in WGS84/UTM37N (EPSG...
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From multiple rasters to one Google earth layer
To create a Google earth map, I would normally export my raster layers as a geo-referenced png file and subsequently use maptiler (or gdal2tiles.py) to create the Google earth map (see here for more...
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A great way to try out open source GIS software
I just came across an email thread on the QGIS email list that mentioned OSGeo-Live. This is a “self-contained bootable DVD, USB thumb drive or Virtual Machine based on Xubuntu, that allows you to try...
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Creating alternative emails from your gmail
In Gmail there is no easy way to sort. The good folks at Google seem to have this idea that everything should be done by searching. Sure, I use the search function all the time. But really… No option...
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From xy table to spatial table in spatialite
A short note on how to create a spatial table from a table with latitude and longitude coordinates in your SQLite / Spatialite database. In the example below, the table I am working with is ‘labels’....
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Exporting point file as kml in GRASS GIS
The v.out.ogr function in GRASS GIS let you export your vector layer to any format supported by OGR (it is basically an interface to the GDAL/OGR function ogr2ogr). This includes kml files. E.g.,...
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Exporting vector layer as kml in QGIS
In my previous post I described how to export a vector layer from GRASS GIS as kml file. The key was to use the dsco parameter to define the columns that should be used for the Name and Description...
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Using TileMill to create maps in mbtiles format
The development of open source spatial tools is amazing. A while ago I wrote how one could create mobile maps using a range of tools, including GRASS or QGIS, Maptiler, and Mobile Atlas Creator...
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Pretty cool new feature for QGIS: HTML map tips
Check out this post by Nathan, where he describes a new QGIS feature! In QGIS (development build) you can now display map tips using (a subset of) HTML. Get the latest development version of QGIS, or...
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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...
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New features and renamed options in GRASS 7
I have started using GRASS 7, mostly / initially because it handles vector layers much better then GRASS 6.4. But is also has a bunch of new features. What also changes are the options / syntax of some...
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Add an application to the Ubuntu dash
How to add an application to the Ubuntu dash. When you install a program from the software center it will be automatically available in the Dash. But what if you want to run a program that is not...
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