The data set consists of a southern African subset of the ISRIC-WISE global data set of derived soil properties.
The World Inventory of Soil Emission Potentials (WISE) database currently contains data for over 4300 soil profiles collected mostly between 1950 and 1995. This database has been used to generate a series of uniform data sets of derived soil properties for each of the 106 soil units considered in the Soil Map of the World (FAO-UNESCO, 1974). These data sets were then linked to a 1/2 degree longitude by 1/2 degree latitude version of the edited and digital Soil Map of the World (FAO, 1995) to generate GIS raster image files for the following variables:
Total available water capacity (mm water per 1 m soil depth)
Soil organic carbon density (kg C/m**2 for 0-30 cm depth range)
Soil organic carbon density (kg C/m**2 for 0-100 cm depth range)
Soil carbonate carbon density (kg C/m**2 for 0-100 cm depth range)
Soil pH (0-30 cm depth range)
Soil pH (30-100 cm depth range)
More information can be found at: ftp://daac.ornl.gov/data/safari2k/soils/ISRIC-WISE_soil_properties/comp/isric_readme.pdf.
Cite this data set as follows:
Batjes, N. H. 2002. SAFARI 2000 Derived Soil Properties, 0.5-Deg (ISRIC-WISE). Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/634.
Batjes, N. H. 1996. Documentation to ISRIC-WISE global data set of derived soil properties on a 1/2 deg by 1/2 deg grid (Version 1.0). Working Paper and Preprint 96/05, ISRIC, Wageningen.
Information about the data format, soil property classes, and the procedure used to create the southern African subset are in the following file: ftp://daac.ornl.gov/data/safari2k/soils/ISRIC-WISE_soil_properties/comp/isric_readme.pdf.