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SOTER-based soil parameter estimates for Southern Africa (ver. 1.0)
Entry ID: ISRIC_SOTWISsaf

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Summary

Abstract: This harmonized set of soil parameter estimates for Southern Africa has been derived from the 1:2M scale Soil and Terrain Database for Southern Africa (SOTERSAF ver. 1.0) and ISRIC-WISE soil profile database.

The land surface of Southern Africa has been characterized using 4022 unique SOTER units, corresponding with 6099 polygons. The major soils have been described using 941 profiles, selected by national soil experts as being representative for these units. The associated soil analytical data have been derived from soil survey reports. These sources seldom hold all the physical and chemical attributes ideally required by SOTER. Gaps in the measured soil profile data have been filled using a step-wise procedure that uses taxonomy-based pedotransfer rules, based on some 9600 soil profiles held in the WISE2 database.

Parameter estimates are presented by soil unit for fixed depth intervals of 0.2 m to 1 m depth for: organic carbon, total nitrogen, pH(H2O), CECsoil, CECclay, base saturation, effective CEC, aluminium saturation, CaCO3 content, gypsum content, exchangeable sodium percentage (ESP), electrical conductivity of saturated paste (ECe), bulk density, content of sand, silt and clay, content of coarse fragments (> 2 mm), and available water capacity (-33 to -1500 kPa). 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 possible confidence in the derived data.

Results are presented as summary files and can be linked to the 1:2M scale SOTERSAF map in a GIS, through the unique SOTER-unit code.

The secondary data are considered appropriate for studies at the continental scale. Correlation of soil analytical data should be done more rigorously when more detailed scientific work is considered.

[Further details: http://www.isric.org/

Related URL

Link: VIEW PROJECT HOME PAGE
Description: View project home page; download documentation and (zipped) data set

Geographic Coverage

N: -0.99074 S: -34.83983 E: 40.842995 W: 11.679219
Min Altitude: 0 Max Altitude: 3500

Data Set Citation

Dataset Originator/Creator: Niels H. Batjes
Dataset Title: SOTER-based soil parameter estimates for Southern Africa (ver. 1.0)
Dataset Release Date: 2004-10-15
Dataset Release Place: Wageningen
Dataset Publisher: ISRIC - World Soil Information
Version: ver. 1.0
Data Presentation Form: ArcView3.3 and MSAccess tables (zipped)
Other Citation Details: http://www.isric.nl/isric/Webdocs/Docs/ISRIC_Report_2004_04.pdf
Online Resource: http://www.isric.nl/isric/CheckRegistration.aspx?dataset=24

Temporal Coverage

Start Date: 1970-01-01

Stop Date: 2003-06-01

Location Keywords

CONTINENT > AFRICA > CENTRAL AFRICA > ANGOLA
CONTINENT > AFRICA > SOUTHERN AFRICA > BOTSWANA
CONTINENT > AFRICA > SOUTHERN AFRICA > LESOTHO
CONTINENT > AFRICA > EASTERN AFRICA > MOZAMBIQUE
CONTINENT > AFRICA > SOUTHERN AFRICA > NAMIBIA
CONTINENT > AFRICA > SOUTHERN AFRICA > SOUTH AFRICA
CONTINENT > AFRICA > SOUTHERN AFRICA > SWAZILAND
CONTINENT > AFRICA > EASTERN AFRICA > TANZANIA
CONTINENT > AFRICA > EASTERN AFRICA > ZIMBABWE

Data Resolution

ISO Topic Category

ENVIRONMENT
IMAGERY/BASE MAPS/EARTH COVER

Quality

The data set's lineage is described in:

Batjes NH 2004. SOTER-based soil parameter estimates for Southern Africa (ver. 1.0). Report 2004/04, ISRIC - World Soil Information, Wageningen (http://www.isric.org/isric/Webdocs/Docs/ISRIC_Report_2004_04.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.

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_SOTWIScaf

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: Internet (downloadable data)
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

Batjes NH 2004. SOTER-based soil parameter estimates for Southern Africa (ver. 1.0). Report 2004/04, ISRIC - World Soil Information, Wageningen (http://www.isric.org/isric/webdocs/Docs/ISRIC_Report_2004_04.pdf)

Batjes NH, R. Al-Adamat, Bhattacharyya T, M. Bernoux, C.E.P. Cerri, P. Gicheru, P. Kamoni, 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 112, 26-34

Dijkshoorn JA 2003. SOTER database for Southern Africa (SOTERSAF; ver. 1.0). Technical Report, ISRIC - World Soil Information, Wageningen (http://www.isric.org/ISRIC/webdocs/docs/sotersaf_techical%20report.pdf)

FAO and ISRIC 2003. Soil and Terrain database for Southern Africa (1:2 million scale). FAO Land and Water Digital Media Series 25, ISRIC and FAO, Rome

Creation and Review Dates

DIF Creation Date: 2007-07-06

Last DIF Revision Date: 2011-08-30

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