Research Output per year
Over the period 2008–2014, the AfSIS project has compiled two soil profile data sets: the Africa Soil Profiles (legacy) database [Leenaars, 2014] and the AfSIS Sentinel Site (new soil samples) database [Vagen et al, 2010], jointly consisting of ca. 28 thousand sampling locations. Using these soil point observations and an extensive collection of global (SoilGrids1km) and local (African continent) environmental covariates, ISRIC - World Soil Information, in collaboration with The Earth Institute, Columbia University, World Agroforestry Centre, Nairobi and the International Center for Tropical Agriculture (CIAT), have produced (February 2015) predictions of soil properties — organic carbon, pH, sand, silt and clay fractions, coarse fragments, bulk density, cation-exchange capacity, total nitrogen, exchangeable acidity, Al content, and exchangeable bases (Ca, K, Mg, Na) — for the whole African continent at 250 m spatial resolution at two or six standard soil depths. The predictions are obtained using an automated mapping framework (3D regression-kriging based on random forests). Compressed GeoTiffs of the soil property maps, together with all metadata, input data sets and the R functions used to generate the maps, are available for download from here. A web-mapping interface to the maps is available via: http://af.soilgrids.org/. Read more about how were these maps made.
|Date made available||13 Jul 2015|
|Publisher||ISRIC - World Soil Information|
Mapping Soil Properties of Africa at 250 m resolution: random forest significantly improve current predictionsHengl, T., Heuvelink, G. B. M., Kempen, B., Leenaars, J. G. B., Walsh, M. G., Shepherd, K. D., Sila, A., Macmillan, R. A., Mendes de Jesus, J. S., Tamene, L. & Tondoh, J. E., 2015, In : PLoS ONE. 10, 6, e0125814.
Research output: Contribution to journal › Article › Academic › peer-review
Hengl, T. (Creator) (13 Jul 2015). Soil property maps of Africa at 250 m. ISRIC - World Soil Information.