Africa SoilGrids nutrients - Total Nitrogen (N)

Total Nitrogen (N) content of the soil fine earth fraction in mg/kg (ppm) as measured according to the soil analytical procedure of wet oxidation 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. Nutriënt 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.

Date (Publication): 2016-12-05

Citation identifier: c5cb0f71-a627-40b9-8acb-5be42e4d5914

Presentation form: Digital map

Status: Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
ISRIC - World Soil Information	Johan Leenaars	johan.leenaars@wur.nl	Author
ISRIC - World Soil Information	Tom Hengl	None	Author

Theme

nutrients
nitrogen
digital soil mapping

Stratum

Soil science

Region

Africa

Access constraints: License

Use constraints: License

Other constraints: Open Database License (ODbl) v1.0

Spatial representation type: Grid

Distance: 250 m

Language: English

Character set: UTF8

Topic category

Geoscientific information

Begin date: 1980-01-01

End date: 2016-12-31

Reference system identifier: EPSG / 4326

Distribution format

Name	Version
GTiff

Digital transfer options

OnLine resource

Protocol	Linkage	Name
WWW:DOWNLOAD-1.0-ftp--download	https://files.isric.org/public/af250m_nutrient/af250m_nutrient_n_m_agg30cm.tif	Download GeoTIFF at depth 30 cm
OGC:WMS	https://maps.isric.org/mapserv?map=/map/af250m_nutrient.map	af250m_nutrient_n_m_agg30cm
WWW:LINK-1.0-http--related	https://isric.org/projects/africa-soilgrids-soil-nutrient-maps-sub-saharan-africa-250-m-resolution	Project webpage
WWW:LINK-1.0-http--related	https://link.springer.com/article/10.1007/s10705-017-9870-x	Scientific paper