A merge of the Africa Soil Profiles Database (AFSP) with 17,000+ geo-referenced legacy soil profile records, and AfSIS Sentinel Site database with 9000+ sampling locations.
Usage
data(afsp)
Format
The afsp data set contains two data frames — sites and horizons. Sites table contains the following columns:
SOURCEID
factor; unique label to help a user identify a particular site (ProfileID in the AFSP)
SOURCEDB
factor; source data base
LONWGS84
numeric; longitude in decimal degrees on the WGS84 datum (X_LonDD in the AFSP)
LATWGS84
numeric; latitude in decimal degrees on the WGS84 datum (Y_LatDD in the AFSP)
TIMESTRR
character; the date on which this particular soil was described or sampled (T_Year in the AFSP)
TAXGWRB
factor; abbreviated soil group based on the WRB classification system (WRB06rg in the AFSP)
TAXNUSDA
factor; Keys to Soil Taxonomy taxon name e.g. "Plinthic Udoxic Dystropept" (USDA in the AFSP)
BDRICM
numeric; depth to bedrock in cm
DRAINFAO
factor; drainage class based on the FAO guidelines for soil description: E (excessively drained), S (somewhat excessively drained), W (well drained), M (moderately well drained), I (somewhat poorly drained) and V (very poorly drained)
Horizons table contains the following columns:
SOURCEID
factor; a short label to help a user identify a particular site
UHDICM
numeric; upper horizon depth from the surface in cm
LHDICM
numeric; lower horizon depth from the surface in cm
MCOMNS
factor; Munsell color moist
ORCDRC
numeric; soil organic carbon content in permilles
PHIHOX
numeric; pH index measured in water solution
SNDPPT
numeric; weight percentage of the sand particles (0.05–2 mm)
SLTPPT
numeric; weight percentage of the silt particles (0.0002–0.05 mm)
CLYPPT
numeric; weight percentage of the clay particles (<0.0002 mm)
CRFVOL
numeric; volume percentage of coarse fragments (> 2 mm)
BLD
numeric;bulk density in tonnes per cubic-meter
CEC
numeric; Cation exchange capacity (fine earth fraction) in cmolc/kg
NTO
numeric; total N content in permille or g/kg
EMGX
numeric; exchangable Mg in cmolc/kg
Author(s)
The Africa Soil Profiles Database have been prepared by Johan Leenaars <johan.leenaars@wur.nl>. This is a subset of the original database that can be downloaded via www.isric.org. The AfSIS Sentinel Site database is one of the main deliverables of the Africa Soil Information Service project.