Harmonized World Soils Database (HWSD)The HWSD is a 30 arc-second raster database with over 16,000 different soil mapping units that combines existing regional and national updates of soil information worldwide (SOTER, ESD, Soil Map of China, WISE) with the information contained within the 1:5,000,000 scale FAO-UNESCO Soil Map of the World (FAO, 19711981). Supplementary data includes Soil Quality, Land Cover and Terrain Data.