Global Change Master Directory (GCMD)

Data Sets

Services / Tools

Ancillary Descriptions

Are you using a browser that doesn't support JavaScript or have you disabled JavaScript?

If you have disabled JavaScript, you must re-enable JavaScript to use this page.
Or you can view this record using the Text Only Format.

SOTER-based soil parameter estimates for Senegal and The Gambia (ver. 1.0)

Entry ID: ISRIC_SOTWISsenegal

[ Update this Record ]

Summary

Abstract: This data set describes a harmonized set of soil parameter estimates for Senegal and The Gambia. It was derived from the Soil and Terrain Database for Senegal and The Gambia (SENSOTER ver. 1.0) and the ISRIC-WISE soil profile database, using standardized taxonomy-based pedotransfer (taxotransfer) procedures.

The land surface of the study area, covering some 200 800 km2, has been characterized ... using 149 unique SOTER units. Each SOTER unit consists of up to four different soil components. In so far as possible, each soil component has been characterized by a regionally representative profile, selected and classified by national soil experts. Conversely, in the absence of any measured legacy data, soil components were characterized using synthetic profiles for which only the FAO-Unesco (1988) classification is known.

Soil components in SENSOTER have been characterized using 90 profiles of which 34 are synthetic. The latter represent some 37 per cent of the territory. Comprehensive sets of measured attribute data are not available for most of the measured profiles (56) collated in SENSOTER. Consequently, to permit modelling, gaps in the soil analytical data have been filled using consistent taxotransfer procedures. Modal soil parameter estimates necessary to populate the taxotransfer procedure were derived from statistical analyses of soil profiles held in the ISRIC-WISE database. The current procedure only considers profiles in WISE that have FAO soil unit names identical to those mapped for SOTER-Senegal (41) and that originate from the Tropics (n= 4510).

Parameter estimates are presented for 18 soil variables by soil unit for fixed depth intervals of 0.2 m to 1 m depth. Thes include: organic carbon, total nitrogen, pH(H2O), CECsoil, CECclay, base saturation, effective CEC, aluminium saturation, CaCO3 content, gypsum content, exchangeable sodium percentage (ESP), electrical conductivity (ECE), bulk density, content of sand, silt and clay, content of coarse fragments (> 2 mm), and available water capacity (-33 kPa to -1.5 MPa). These attributes have been identified as being useful for agro-ecological zoning, land evaluation, crop growth simulation, modelling of soil carbon stocks and change, and analyses of global environmental change.

The current parameter estimates should be seen as best estimates based on the current selection of soil profiles and data clustering procedure. Taxotransfer rules have been flagged to provide an indication of the confidence in the derived data.

Soil parameter estimates are presented as summary files (in MS-Access format) which can be linked to the SENSOTER map using GIS, through the unique SOTER-unit code (NEWSUID).

The derived (secondary) soil data for Senegal and The Gambia are considered appropriate for exploratory studies at national scale (1:1 million); these should consider the full map unit composition.

Related URL

Link: VIEW PROJECT HOME PAGE

Description: View project home page; download documentation and (zipped) data set

Multimedia Sample

View full image

Caption: Derived soil data for Senegal and The Gambia

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

	N: 16.5	S: 12.0	E: -11.0	W: -18.0
Min Altitude: 0

Data Set Citation

Dataset Originator/Creator: Niels H. Batjes

Dataset Title: SOTER-based soil parameter estimates for Senegal and The Gambia

Dataset Release Date: 20081111

Dataset Release Place: Wageningen

Dataset Publisher: ISRIC - World Soil Information

Version: ver. 1.0

Data Presentation Form: ArcGis 9.x and MSAccess tables (zipped)

Other Citation Details: http://www.isric.org/isric/Webdocs/Docs/ISRIC_Report_2008_05.pdf

Online Resource: http://www.isric.nl/isric/CheckRegistration.aspx?dataset=45

Temporal Coverage

Start Date: 1956-01-01

Stop Date: 2003-12-31

Location Keywords

CONTINENT > AFRICA > WESTERN AFRICA > GAMBIA

CONTINENT > AFRICA > WESTERN AFRICA > SENEGAL

Data Resolution

Horizontal Resolution Range: 10 km - < 50 km or approximately .09 degree - < .5 degree

Science Keywords

AGRICULTURE > AGRICULTURAL PLANT SCIENCE > CROPPING SYSTEMS

AGRICULTURE > SOILS > CARBON

ISO Topic Category

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

BIOTA

Project

BOREAS > The Boreal Ecosystem-Atmosphere Study

EOSDIS > Earth Observing System Data Information System

ESIP > Earth Science Information Partners Program

CWIC > CEOS WGISS Integrated Catalog

Ancillary Keywords

GPP

NPP

Data Set Progress

COMPLETE

Data Center

THE OAK RIDGE NATIONAL LABORATORY (ORNL) DISTRIBUTED ACTIVE ARCHIVE CENTER (DAAC)

Data Center URL: http://daac.ornl.gov/
Dataset ID: 296

Data Center Personnel
Name: ORNL DAAC USER SERVICES OFFICE Phone: (865) 574-7447 Email: uso at daac.ornl.gov Contact Address: ORNL DAAC User Services Office Oak Ridge National Laboratory City: Oak Ridge Province or State: TN Postal Code: 37831-6407 Country: USA