Posts

This blog serves as a combination of blog and personal notebook. I’ll might write about the use of open source software in research and education, or more specifically, about the use of GIS and other analytical tools. However, once in a while, I might get inspired and write about a totally different subject. We’ll see.

Working with the Bing maps roads data set

Extracting and converting a subset of the data

Bing Maps released a data set with mined roads around the world. It is a great data set, but not an easy one to work with due to the size. Luckily, with just a few lines of code, you can extract the data for a user-defined region and import the resulting data in a geoPackage. tags: GDAL, OGR, open data, Nepal, data import, data wrangling

Jan 2, 2023

5 min

Boxplots based on raster data in GRASS GIS

Introducing three GRASS GIS addons

This post introduces three GRASS GIS addons to create boxplots using raster layers as input. They can be used to compare the distribution of a variable change over time, or to compare how conditions vary within and between two or more area.

Nov 27, 2022

34 min

tutorial,osgeo

Switching to Quarto

I just finished porting my blog, based on blogdown and Hugo, to Quarto. Main reason was a number of small but handy improvements. Main challenge was to find all those small tweaks and make them work in the new setup. But it all worked out nicely.

Oct 25, 2022

2 min

Removing the background in a picture

With a single line of code

With only one line of code, the rembg package finds the object of interest in a picture and removes the background. Or, at least, that is what it promises. But does it hold up to that promise? tags: U2-Net, image segmentation, image classification, deep learning, artifcial neural network

Oct 8, 2022

3 min

Working with the global Building Footprints data

Or, how to deal with very large geojson files

The open building footprints from Bing Maps is a great data set. However, it is not an easy one to work with due to the size. Luckily, with just a few lines of code, you can split the file in manageable chunks that are easier to deal with. tags: GDAL, OGR, open data, Nepal, data import, data wrangling

Categories

Working with the Bing maps roads data set

Boxplots based on raster data in GRASS GIS

Switching to Quarto

Removing the background in a picture

Working with the global Building Footprints data

MODIS fire data in GRASS GIS

Calc - Importing tables from web pages

Create a QR code in Libreoffice

Upload raster labels to a point layer attribute table

Latest GRASS GIS addons now also available for Windows

Storing styles and metadata in a GeoPackage

Playing with animal tracking data in QGIS

Compute the area per category

Distance between features

Import GBIF data

Interactive dashboards with R

Linking spatial and non-spatial dataframes

Access soilgrid data using the WCS protocol

RStudio meets Zotero

Tree species diversity distribution

Huis ter Heide

Adding functions to the QGIS toolbox

GISQuick

Import NASA DEM in GRASS GIS

QGIS 3.14 is there

Legend for continuous raster in QGIS composer

Creating a map with inset using tmap

Recording sounds

De Grote Geo Show

New GRASS GIS website

Comparing human population density maps

Migrating from ecostudies to ecodiv