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


Geographic Coverage
 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.org/sites/all/modules/pubdlcnt/pubdlcnt.php?file=h...


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


Science Keywords
AGRICULTURE >AGRICULTURAL PLANT SCIENCE >CROPPING SYSTEMS    [Definition]
AGRICULTURE >SOILS >CARBON    [Definition]
AGRICULTURE >SOILS >CATION EXCHANGE CAPACITY    [Definition]
AGRICULTURE >SOILS >ELECTRICAL CONDUCTIVITY    [Definition]
AGRICULTURE >SOILS >ORGANIC MATTER    [Definition]
AGRICULTURE >SOILS >SOIL ABSORPTION    [Definition]
AGRICULTURE >SOILS >SOIL BULK DENSITY    [Definition]
AGRICULTURE >SOILS >SOIL CLASSIFICATION    [Definition]
AGRICULTURE >SOILS >SOIL DEPTH    [Definition]
AGRICULTURE >SOILS >SOIL HORIZONS/PROFILE    [Definition]
AGRICULTURE >SOILS >SOIL PH    [Definition]
AGRICULTURE >SOILS >SOIL TEXTURE    [Definition]
AGRICULTURE >SOILS    [Definition]
LAND SURFACE >SOILS >CARBON    [Definition]
LAND SURFACE >SOILS >CATION EXCHANGE CAPACITY    [Definition]
LAND SURFACE >SOILS >ELECTRICAL CONDUCTIVITY    [Definition]
LAND SURFACE >SOILS >NITROGEN    [Definition]
LAND SURFACE >SOILS >ORGANIC MATTER    [Definition]
LAND SURFACE >SOILS >SOIL ABSORPTION    [Definition]
LAND SURFACE >SOILS >SOIL BULK DENSITY    [Definition]
LAND SURFACE >SOILS >SOIL CLASSIFICATION    [Definition]
LAND SURFACE >SOILS >SOIL DEPTH    [Definition]
LAND SURFACE >SOILS >SOIL HORIZONS/PROFILE    [Definition]
LAND SURFACE >SOILS >SOIL PH    [Definition]
LAND SURFACE >SOILS >SOIL WATER HOLDING CAPACITY    [Definition]
LAND SURFACE >SOILS    [Definition]
AGRICULTURE >SOILS >SOIL ROOTING DEPTH    [Definition]
LAND SURFACE >SOILS >SOIL ROOTING DEPTH    [Definition]


ISO Topic Category
ENVIRONMENT
GEOSCIENTIFIC INFORMATION
IMAGERY/BASE MAPS/EARTH COVER


Project
SOTERPROGRAM >SOTER - Soil and Terrain Database Programme    [Information]


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 copyright holders. Applications for such permission should be addressed to:
Director, ISRIC - World Soil Information, PO Box 353, 6700 AJ Wageningen, the Netherlands or by e-mail to soil.isric@wur.org.

ISRIC requests you to acknowledge use of our data; this will allow us to gauge the interest and usefulness of our services. Please refer to the dataset documentation for suggested form of acknowledgement and correct citation.

(http://www.isric.org/UK/About+ISRIC/Services/Data+Supply/Citation.htm)


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

Data Center Personnel
Name: NIELS H. BATJES
Phone: +31-317-483735
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: +31-317-483735
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
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)

Batjes NH 2008. ISRIC-WISE Harmonized Global Soil Profile Dataset (Version 3.1). Report 2008/02, ISRIC - World Soil Information, Wageningen. (http://www.isric.org/isric/webdocs/Docs/ISRIC_Report_2008_02.pdf)

Batjes NH, Al-Adamat R, Bhattacharyya T, Bernoux M, Cerri CEP, Gicheru P, Kamoni P, Milne E, Pal DK and Rawajfih Z 2007. Preparation of consistent soil data sets for SOC modelling purposes: secondary SOTER data sets for four case study areas. Agriculture, Ecosystems and Environment 122, 26-34
(http://dx.doi.org/10.1016/j.agee.2007.01.005)

Dijkshoorn JA, van Engelen VWP and Huting JRM 2008. Soil and landform properties for LADA partner countries (Argentina, China, Cuba, Senegal and The Gambia, South Africa and Tunisia), ISRIC – World Soil Information and FAO, Wageningen, Wageningen (http://www.isric.org/isric/Webdocs/Docs/ISRIC_Report_2008_06.pdf)

Creation and Review Dates
DIF Creation Date: 2008-11-10
Last DIF Revision Date: 2013-10-09

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