Soil texture is of primary importance for a long list of soil science and soil management applications: erosion, water permeability, root growth, organic carbon stocks quantification, etc. Having a reference map at the scale of the Walloon Region was thus turned into a priority by the Service Public de Wallonie.

With no additional data collection, the challenge consisted in producing soil texture maps for 5 fractions and 3 depths. Alongside those maps, uncertainty maps were also provided.

Advanced geostatistical techniques were implemented to combine punctual granulometric measurements with exhaustively available soil texture classes.