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

Entry ID: ISRIC_SOTWISsenegal

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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

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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

ENVIRONMENT

GEOSCIENTIFIC INFORMATION

IMAGERY/BASE MAPS/EARTH COVER

Project

SOTERPROGRAM > SOTER - Soil and Terrain Database Programme

Quality The data set's lineage is described in:

Batjes NH 2008. Soil parameter estimates for Senegal and The Gambia derived from SOTER and WISE (SOTWIS-Senegal, ver. 1.0). Report 2008/05, ISRIC - World Soil Information, Wageningen (with data set)
(http://www.isric.org/isric/Webdocs/Docs/ISRIC_Report_2008_05.pdf)

Access Constraints ISRIC kindly requests that you send us two reprints of any publication that uses data received from ISRIC - World Soil Information. This will help us to determine the type and level of use of the data we distribute.

Use Constraints Materials developed by ISRIC are copyrighted, all rights reserved. Reproduction and dissemination of such materials for educational or non-commercial purposes are authorized without any prior written permission from the copyright holders provided the source is fully acknowledged. Reproduction of materials for resale or other commercial purposes is prohibited without prior written permission of the ...

Ancillary Keywords

secondary (derived) soil data

soil parameter estimates

Data Set Progress

COMPLETE

Originating Center

ISRIC - World Soil Information

Data Center

World Data Center for Soils, ISRIC - World Soil Information, Wageningen

Data Center URL: http://www.isric.org
Dataset ID: ISRIC_SOTWISsenegal

Data Center Personnel
Name: NIELS H. BATJES Phone: +31-317-471700 Email: niels.batjes at wur.nl Contact Address: ISRIC - World Soil Information (World Data Center for Soils) P.O. Box 353 City: Wageningen Postal Code: 6700 AJ Country: The Netherlands

Distribution

Distribution Media: on-line dataset

Distribution Size: 29 Mb zipped, 39 Mb unzipped

Distribution Format: MS-Access and ArcGIS9/ArcMAp9.2

Fees: n/a

Personnel

NIELS H. BATJES

Role: INVESTIGATOR

Phone: +31-317-471700

Email: niels.batjes at wur.nl

Contact Address:

ISRIC - World Soil Information (World Data Center for Soils)

P.O. Box 353

City: Wageningen

Postal Code: 6700 AJ

Country: The Netherlands

Publications/References

This data set:

Creation and Review Dates

DIF Creation Date: 2008-11-10

Last DIF Revision Date: 2011-08-30

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