Meeting nő 67. Minutes of Board Meeting No. 19
Heuvelink, and Joop Okx Since the establishment of Digital Soil Mapping DSM as a research field, the main focus has been on implementing new methods to improve the predictive performance of soil maps. However, considerably less effort has been invested in investigating the best way meeting nő 67 communicate the quality of soil mapping products with users. This is essential for soil maps to be adopted by a broader community, future research guidance and most importantly, to ensure that they are used correctly.
Our objectives are twofold: a providing accurate and high-resolution 25m soil pH, soil organic carbon, and soil texture clay, silt, and sand maps over 3D space including prediction uncertainty; and b providing an intuitive way to communicate accuracy of soil maps for users by means of accuracy thresholds. In this work, the first outputs of the modelling and mapping platform BIS-3D are being presented.
Predicted soil maps were evaluated using an independent validation data set based on a stratified random sampling design covering the entire Netherlands locations. A categorical physical geography map was the most important covariate, although other covariates associated with relief, geomorphology, land use and temperature were also effective.
However, such variable importance measurements are merely indications and should be handled with care. The BIS-3D can easily be extended for predicting additional soil properties and it may provide a basis for decision makers to easily assess to what extent and in which areas soil maps can be used for their applications.
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