The NASADEM_HGT dataset is a 1 arcsecond void-filled dataset which combines data from the SRTM and ASTER GDEM data. It can be downloaded from EarthData in 1° by 1° tiles. But if you are using GRASS GIS, downloading is greatly fascilitated using the addon. The addon imports all NASADEM tiles covering the current region or region extents given with the region option into GRASS and patches the tiles together.

Legend for continuous raster in QGIS composer

This blogpost shows in a few steps how to add a continuous colour legend for a raster layer in a map layout in QGIS. It is a work around, but it works.

Creating a map with inset using tmap

Plotting maps with tmap Get the libraries Main map Inset map Create the final map All the code Plotting maps with tmap Figure 1: A map of the distances to the nearest Natura2000 areas in a region in the central Oder basin.

De Grote Geo Show

The Grote Geoshow is a Dutch show on Twitch (live) and YouTube by the foundation and friends. It airs every Thursday afternoon and is all about open geo topics.

New GRASS GIS website

GRASS GIS is a fantastic software package, not only one of the oldest GIS packages still around, but also one that is continuously updating and improving thanks to a vibrant community.

Comparing human population density maps

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.

Open source tools

Programs like R and GRASS GIS are incredible powerfull. But occasionally you'll need a functionality that is not available yet. Luckily, depending on the kind of functionality, it isn't terribly difficult to create your own scripts. In the past years I have created a few scripts that I hope are useful to others as well.

Website of the foundation.