290d3e5d-e173-4f6b-8831-053b819d75fc
dataset
Ulan Turdukulov
ISRIC - World Soil Information
ulan.turdukulov@isric.org
2021-07-14T11:52:25
ISO 19115:2003/19139
2003/Cor.1:2006
4326
EPSG
Africa SoilGrids nutrients - Extractable Sodium (Na)
2016-12-05
290d3e5d-e173-4f6b-8831-053b819d75fc
Extractable Sodium content (Na) of the soil fine earth fraction in mg/kg (ppm) as measured according to the soil analytical procedure of Mehlich 3 and spatially predicted for 0-30 cm depth interval at 250 m spatial resolution across sub-Saharan Africa using Machine Learning (ensemble between random forest and gradient boosting) using soil data from the Africa Soil Profiles database (AfSP) compiled by AfSIS and recent soil data newly collected by AfSIS in partnership with EthioSIS (Ethiopia), GhaSIS (Ghana) and NiSIS (Nigeria as made possible by OCP Africa and IITA), combined with soil data as made available by Wageningen University and Research, IFDC, VitalSigns, University of California and the OneAcreFund. [Values M = mean value predicted]. For details see below for peer reviewed paper (T. Hengl, J.G.B. Leenaars, K.D. Shepherd, M.G. Walsh, G.B.M. Heuvelink, Tekalign Mamo, H. Tilahun, E. Berkhout, M. Cooper, E. Fegraus, I. Wheeler, N.A. Kwabena, 2017. Soil nutrient maps of Sub-Saharan Africa: assessment of soil nutrient content at 250 m spatial resolution using machine learning. Nutriƫnt Cycling in Agroecosystems 109(1): 77-102). Maps produced for the Environmental Assessment Agency (PBL), funded by the Netherlands government, in collaboration with the AfSIS and the Vital Signs projects.
Johan Leenaars
ISRIC - World Soil Information
Senior soil scientist
PO Box 353
Wageningen
6700AJ
Netherlands
johan.leenaars@wur.nl
Tom Hengl
ISRIC - World Soil Information
Former staff
PO Box 353
Wageningen
6700AJ
Netherlands
None
https://maps.isric.org/mapserv?map=/map/af250m_nutrient.map&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&BBOX=-35,-30,29,56&CRS=EPSG:4326&WIDTH=1426&HEIGHT=895&LAYERS=af250m_nutrient_na_m_agg30cm&STYLES=&FORMAT=png
nutrients
sodium
digital soil mapping
Soil science
Stratum
Africa
Region
Open Database License (ODbl) v1.0
250
geoscientificInformation
1980-01-01
2016-12-31
-29.7
55.4
-34.9
28.7
GTiff
https://files.isric.org/public/af250m_nutrient/af250m_nutrient_na_m_agg30cm.tif
WWW:DOWNLOAD-1.0-ftp--download
Download GeoTIFF at depth 30 cm
https://maps.isric.org/mapserv?map=/map/af250m_nutrient.map
OGC:WMS
af250m_nutrient_na_m_agg30cm
https://isric.org/projects/africa-soilgrids-soil-nutrient-maps-sub-saharan-africa-250-m-resolution
WWW:LINK-1.0-http--related
Project webpage
https://link.springer.com/article/10.1007/s10705-017-9870-x
WWW:LINK-1.0-http--related
Scientific paper
Project webpage: http://isric.org/projects/africa-soilgrids-soil-nutrient-maps-sub-saharan-africa-250-m-resolution
Soil data (1): http://isric.org/projects/africa-soil-profiles-database-afsp
Soil data (2): http://africasoils.net/services/data/soil-databases/