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New release RQGIS
From an announcement from the QGIS mailing list: RQGIS has released a new version of RQGIS! RQGIS establishes an interface between R and QGIS, i.e. it allows the user to access the QGIS geoalgorithms...
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Terrain attribute selection in environmental studies
Terrain attribute selection Exploring species-environment relationships is important for amongst others habitat mapping, biogeographical classification, conservation, and management. And it has become...
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Exporting rasters to Mbtiles using GDAL
Web maps are generally made up of many small, square images called tiles, which are placed side by side in order to create the illusion of a very large seamless image [for a good explanation, see...
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Update r.vif add-on for GRASS GIS
I just updated the r.vif add-on. The add-on let’s you do a step-wise variance inflation factor (VIF) procedure. As explained in more detail here, the VIF can be used to detect multicollinearity in a...
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GRASS and Pandas – from attribute table to pandas dataframe
Introduction In this post I show how to import an attribute table of a vector layer in a GRASS GIS database into a Pandas data frame. Pandas stands for Python Data Analysis Library which provides...
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Plotting GRASS data in Python
GRASS GIS offers some useful but basic plotting options for raster data. However, for plotting of data in attribute tables and for more advanced graphs, we need to use other software tools. In this...
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GRASS GIS 7.2.1 released
After four months of development the new update release GRASS GIS 7.2.1 is available. It provides more than 150 stability fixes and manual improvements compared to the first stable release version...
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K-fold cross validation in GRASS GIS
A common technique to estimate the accuracy of a predictive model is k-fold cross-validation. In k-fold cross-validation, the original sample is randomly partitioned into a number of sub-samples with...
View ArticleGRASS GIS Jupyter notebooks
A great source of information about GRASS GIS is the GRASS Wiki. One example is this list with GRASS GIS Jupyter notebooks which was just added by Markus Neteler (no introduction needed I guess). There...
View ArticleHands-on course to GIS and Remote Sensing with GRASS GIS
The hands-on GRASS GIS course at ITC – University of Twente on November 3rd, 2017 was a great success. The course, organized by ITC and OSGeo.nl, offered a very nice introduction to GRASS GIS by...
View ArticleDraw a histogram of vector attribute column in GRASS GIS
GRASS GIS has convenient tools to draw histograms of raster values. As similar tool to draw a histogram of values in a vector attribute table lacks. But you can easily add this functionality by...
View ArticleData exploration in GRASS GIS – boxplots
I am currently working on some exercises for which I need data about municipalities in the Netherlands. A good place to look for such data is the CBS (Dutch Central Bureau of Statistics). One data...
View ArticleUpdate release GRASS GIS 7.4.4
For those who missed it, a new update release GRASS GIS 7.4.4 is available since the 4th of January. It mainly brings bugfixes, but it also includes an important new function, the module...
View ArticleGRASS GIS 7.6.0 released
After almost 1 year of development the GRASS Development team has released the new stable release GRASS GIS 7.6.0. A big thanks to all developers for their work and dedication! There is a lot to like,...
View ArticleHigh resolution maps of the human population density in Africa
Population density maps have multiple implications, e.g., to help relief agencies to better plan where they are needed most in case of disaster and in demographic, economic and environmental research....
View ArticleGRASS GIS 7.8.3 released
The latest and greatest GRASS GIS 7.8.3 released. See the announcement on https://grass.osgeo.org/news/89/15/GRASS-GIS-7-8-3-released/. And if you haven’t updated to the 7.8 release series yet, make...
View ArticleEcostudies EOL
I have kept a blog on this site for quite some years. It was mostly about using open source GIS tools. Although I enjoyed writing the posts, other things became more important, and I haven’t written a...
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