China Machine learning Biogeochemistry 2 Decision trees 2 Interpolation 2 Organic compounds 2 Random forest 2 Random forests 2 Soil organic matters 2 Soil surveys 2 Soils 2 accuracy assessment 2 machine learning 2 model validation 2 soil organic matter 2 Agriculture 1 Coal 1 Coal deposits 1 Coalfield 1 Coalfields 1 DBSCAN 1 Density-based spatial clustering of applications with noise 1 Digital soil mappings 1 Dongzhi Loess Tableland 1 Dongzhi loess tableland 1 Environment factor 1 Gradient boosting modeling 1 High accuracy surface modeling 1 High-accuracy 1 Indicator indicator 1