Posts

The posts below are mostly focussed on the use of open source software in research and education. And to specificy this even further, it will likely be about the use of GIS and other analytical tools. But, I might get inspired and write about a totally different subject. I will also migrate some of the potentially useful blogposts from Ecostudies over to this site, so I can eventually shut that one down.

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.

MODIS fire data in GRASS GIS

In this post I show how to import 8-day MODIS satellite images from 2002-2021 in a GRASS GIS temporal database, and how to compute some summary statistics based on these data layers.

Create a QR code in Libreoffice

If you are using a software tool for a long time, it is easy to miss out on (new) features. Like this cool feature in Libreoffice to create a QR or barcode. And it is really simple

Calc - Importing tables from web pages

To grab a table from a website isnt terribly difficult. One can simply copy and paste it in your document. But especially if the page contains many tables, there is an easier way to get the tables in your LibreOffice spreadsheet.

Upload raster labels to a point layer attribute table

Introducing the v.what.rast.label addon. An little utility to sample the raster values and labels at point locations defined by a vector point layer. Values and labels are written to the attribute table of the point layer.

Latest GRASS GIS addons now also available for Windows

For Window users, several new GRASS GIS addons that were published recently did not show up in the list of available addons when running the g.extension function. But as a great start of the new year, this has now been fixed.

Storing styles and metadata in a GeoPackage

There are many reasons to like the GeoPackage. One is that it makes it so easy to share your data, including symbology and other layer properties in one database file. And what makes this even better is that you can also store QGIS projects directly inside GeoPackage files. This gets you a totally self-contained GeoPackage that you can easily share

Playing with animal tracking data in QGIS

Using the Temporal Controller in QGIS to visualize the movements of cattle in the Logone Floodplain in Cameroon. Based on data from the Movebank, a free, online database of animal tracking data.

Compute the area per category

A short note about different ways in GRASS GIS to create a raster layer with as values the surface area of the categories in another raster layer.

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