Full name:
Africa SoilGrid properties
Version:
-
Organization or Author:
ISRIC - World Soil Information, in collaboration with The Earth Institute (Columbia University), ICRAF - World Agroforestry Centre, Nairobi and the International Center for Tropical Agriculture (CIAT).
Abstract:
Over the period 2008–2014, the AfSIS project has compiled two soil profiles / samples datasets: the Africa Soil Profiles database holding legacy soil profiles data and the Sentinel Sites database holding newly collected topsoil data, jointly consisting of around 28 thousand sampling locations and a total of 85 thousands samples. Using these soil point observations & measurements and an extensive collection of global (SoilGrids1km) and continental (Africa) 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), has produced predictions of soil properties for the whole African continent at 250 m spatial resolution at either two or six standard soil depths.
Service location:
Geographical Coverage:
Continental - Africa
GIS Data Type:
Raster
Spatial resolution:
250 m (250 x 250 m pixel)
Publication date:
2015-02-10
Reference period-start:
1960-01-01
Reference period-stop
2015-12-31
License:
Soil Properties:
Potassium, Bulk Density, Cation Exchange Capacity, silt, Sodium, Nitrogen, Clay, sand, Coarse Fragments, Organic Carbon Content, Extractable Bases, Calcium, pH, Aluminium, Exchangeable acidity, Rock Horizon
Soil deph coverage (cm):
0-200 cm
Citation:
Hengl T, Heuvelink GBM, Kempen B, Leenaars JGB, Walsh MG, Shepherd KD, et al. (2015) Mapping Soil Properties of Africa at 250 m Resolution: Random Forests Significantly Improve Current Predictions PLoS ONE 10(6): e0125814. doi:10.1371/journal.pone.0125814
Overview
More Information on the model at the following link: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0125814
| Name | Original name | Unit of measurement | Description |
|---|---|---|---|
| Aluminium | Aluminium | cmolc/kg | Exchangeable aluminium (Al3+ measured in 1M KCl solution) in cmolc/kg (fine earth) predicted using two sets of Africa soil profiles data. |
| Rock Horizon | Rock horizon | cm | Depth to bedrock (R horizon) in cm predicted using two sets of Africa soil profiles data. |
| Bulk Density | Bulk density | kg/m3 | Bulk density of the soil fine earth (measured by core method) in kg / cubic-meter (kg/m3) predicted using the Africa Soil Profiles Database (AfSP) |
| Cation Exchange Capacity | Cation exchange capacity | cmolc/kg | Cation exchange capacity (CEC measured in 1 M NH4OAc buffered at pH 7) in cmolc/kg (fine earth) predicted using the Africa Soil Profiles Database (AfSP) |
| Clay | Clay | g/100g | Clay content (0-2 micro meter) in g/100g (w%) predicted using two sets of Africa soil profiles data |
| Coarse Fragments | Coarse fragments | m3/100m3 | Volumetric coarse fragments content (estimated in the field) in v% (m3/100m3) predicted using the Africa Soil Profiles Database (AfSP) |
| Exchangeable acidity | Exchangeable acidity | cmolc/kg | Exchangeable acidity (H+Al measured in 1M KCl) in cmolc/kg (fine earth) predicted using two sets of Africa soil profiles data |
| Calcium | Calcium | cmolc/kg | Exchangeable calcium (Ca2+; measured in 1M NH4OAc buffered at pH 7 with part of the data converted from data measured according to Mehlich 3) in cmolc/kg (fine earth) predicted using two Africa soil profiles datasets |
| - | Magnesium | cmolc/kg | Exchangeable magnesium (Mg2+ measured in 1M NH4OAc buffered at pH 7 with part of the data converted from data measured according to Mehlich 3) in cmolc/kg (fine earth) predicted using two Africa soil profiles datasets. |
| Sodium | Sodium | cmolc/kg | Exchangeable sodium (Na+ measured in 1M NH4OAc buffered at pH 7 with part of the data converted from data measured according to Mehlich 3) in cmolc/kg (fine earth) at 20-50 cm depth predicted using two Africa soil profiles datasets |
| Extractable Bases | Exchangeable bases | cmolc/kg | Sum of exchangeable bases (Ca2+, Mg2+, K+, Na+ measured in 1M NH4OAc buffered at pH 7 with part of the data converted from data measured according to Mehlich 3) in cmolc/kg (fine earth) predicted using two Africa soil profiles datasets |
| Potassium | Potassium | cmolc/kg | Exchangeable potassium (K+; measured in 1M NH4OAc buffered at pH 7 with part of the data converted from data measured according to Mehlich 3) in cmolc/kg (fine earth) predicted using two Africa soil profiles datasets |
| Nitrogen | Nitrogen | g/kg | Total nitrogen (N) content in g/kg of the fine earth fraction measured according to the analytical procedures of wet oxidation and predicted using two sets of Africa soil profiles data. |
| Organic Carbon Content | Organic carbon content | g/kg | Soil organic carbon content (measured by either wet oxidation or dry combustion at 900 C) in g/kg (fine earth) predicted using two sets of Africa soil profiles data. |
| pH | pH | pH x 10 | Soil pH x 10 in H2O (to convert to pH values divide by 10) predicted using two sets of Africa soil profiles data |
| silt | Silt | g/100g | Silt content (2-50 micro meter) in g/100g (w%) predicted using two sets of Africa soil profiles data. |
| sand | Sand | g/100g | Sand content (50-2000 micro meter) in g/100g (w%) predicted using two sets of Africa soil profiles data. |