GIS

Working with the global Building Footprints data

The open building footprints, released by Bing Maps, is a great data set. However, it is not an easy one to work with. You can download GeoJSON files for each country separately, but even so, they are too large to work with. Luckily, with just a few lines of code, you can split the file in manageable chunks that are easier to deal with. Read on to see how.

Distance between features

Calculating the distance between features (points, polygons, lines) is a common GIS task. Here I will use GRASS GIS to calculate the nearest sighting of mountain lions to Minnesota according to the Global Biodiversity Information Facility (GBIF) database.

Legacy GIS tutorials and notes

Tutorials and user notes on the use of open source tools on the old ecodiv site. The objective is to provide some practical / hands-on examples of (spatial) data handling and analysis that can be done in GRASS GIS and related software tools such as R, QGIS and SQLite

Distance between features

Calculating the distance between features (points, polygons, lines) is a common GIS task. In this tutorial I will calculate the nearest sighting of mountain lions to Minnesota in GRASS GIS

Access soilgrid data using the WCS protocol

The soil data layers from soilgrid.org provides access to grid layers representing the spatial distribution of soil properties across the globe. This tutorial shows how to use the Python OWSLib package to access the data via the Web Coverage Service (WCS) protocol, the Python rasterio package to inspect and print the data, and GRASS GIS to store the data.

Import NASA DEM in GRASS GIS

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 r.in.nasadem 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 OSGeo.nl 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.