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Tier 4 maps of soil pH at 25 m resolution for the Netherlands

posted on 07.09.2021, 06:30 by Anatol HelfensteinAnatol Helfenstein, Vera L. Mulder, Gerard B.M. Heuvelink, Joop P. Okx
This dataset contains maps (GeoTIFFs) of soil pH of six standard depth layers for the Netherlands at 25 m resolution. The six standard depth layers are from 0-5 cm, 5-15 cm, 15-30 cm, 30-60 cm, 60-100cm and 100-200cm. For each of these depth layers, there is a map of mean predictions, the 5th, 50th (median) and 95th quantile, as well as the 90% prediction interval (PI90 = 95th - 5th quantile) and a categorical map of the accuracy thresholds ("none", A, AA and AAA) based on GlobalSoilMap specifications for Tier 4 products. The accuracy thresholds were derived from the PI90, which is a measure of prediction uncertainty. All maps are based on predictions (mean) and estimations (quantiles) using a Quantile Regression Forest model, which was calibrated using 15338 soil pH measurements from the "Bodemkundig Informatie Systeem" (BIS) and 195 covariates (spatially explicit environmental variables of soil forming factors).


This project (WOT-04-013-010) was financed by the Dutch Ministry of Agriculture, Nature and Food Quality: https://research.wur.nl/en/projects/soil-property-mapping-wot-04-013-010





The Netherlands


GeoTIFF (.tif)


Department of Environmental Sciences, Wageningen University and Research