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Africa Soil Information Service (AfSIS): Topographic Wetness Index (TWI)
Entry ID: ICRAF_AfSIS_TWI

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Summary
Abstract: The Africa Soil Information Service (AfSIS): Topographic Wetness Index (TWI) is a 90m raster dataset showing zones of increased soil moisture where the landscape area contributing runoff is large and slopes are low. The topographic wetness index, originally developed by Beven and Kirkby in 1979, provides a measure of wetness conditions at the catchment scale. This dataset combines local upslope ... View entire text
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Link: GET DATA
Description: Data in GeoTIFF format. Image accessible in pre-set files corresponding to a specific country in Africa or a user-defined area of the continent
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Geographic Coverage
(Click for Interactive Map)
Spatial coordinates   
  N: 37.35   S: -34.84   E: 51.41   W: -17.54

Data Set Citation
Dataset Originator/Creator: Vagen, T.-G.
Dataset Title: Africa Soil Information Service (AfSIS): Topographic Wetness Index (TWI)
Dataset Release Date: 2010
Dataset Release Place: Palisades, NY and Nairobi, Kenya
Dataset Publisher: Center for Tropical Agriculture - Tropical Soil Biology and Fertility Institute (CIAT-TSBF), World Agroforestry Centre (ICRAF), Center for International Earth Science Information Network (CIESIN), Columbia University
Data Presentation Form: map, raster digital data
Online Resource: http://africasoils.net/
Location Keywords
CONTINENT > AFRICA > NORTHERN AFRICA > ALGERIA
CONTINENT > AFRICA > CENTRAL AFRICA > ANGOLA
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Science Keywords
ISO Topic Category
Project
Access Constraints None
Use Constraints Rights to this data have been waived in accordance with CC0 1.0 Universal (http://creativecommons.org/publicdomain/zero/1.0/). Please use this citation: Vagen, T.-G. 2010. Africa Soil Information Service: Hydrologically Corrected / Adjusted SRTM DEM (AfrHySRTM). Nairobi, Kenya and Palisades, NY: International Center for Tropical Agriculture - Tropical Soil Biology and Fertility Institute (CIAT-TSBF), World Agroforestry Centre (ICRAF), Center for International Earth Science Information Network (CIESIN), Columbia University. Available at http://africasoils.net/.
Ancillary Keywords
Data Set Progress
COMPLETE
Originating Center
ICRAF
Data Center
World Agroforestry Centre, International Centre for Research in Agroforestry, Consultative Group on International Agricultural Research Supplemental Info
Data Center URL: http://www.worldagroforestrycentre.org/af1/index.php
Dataset ID: ICRAF_AfSIS_TWI

Data Center Personnel
Name: WORLD AGRO-FORESTRY CENTRE (ICRAF)
Phone: +254 2 524001
Email: afsis.info at africasoils.net
Contact Address:
ICRAF Complex, United Nations Avenue, Gigiri, PO Box 30677
City: Nairobi
Country: Kenya
Distribution
Distribution Media: Online HTTP
Distribution Format: GeoTIFF
Fees: 0
Personnel
WORLD AGRO-FORESTRY CENTRE (ICRAF)
Role: TECHNICAL CONTACT
Phone: +254 2 524001
Email: afsis.info at africasoils.net
Contact Address:
ICRAF Complex, United Nations Avenue, Gigiri, PO Box 30677
City: Nairobi
Country: Kenya
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Publications/References
Vagen, T-G. 2010. Africa Soil Information Service (AfSIS): Hydrologically Corrected/Adjusted SRTM DEM (AfrHySRTM). Palisades, NY and Nairobi, Kenya: International Center for Tropical Agriculture - Tropical Soil Biology and Fertility Institute (CIAT-TSBF), World Agroforestry Centre (ICRAF), Center for International Earth Science Information Network (CIESIN), Columbia University. Available at http://africasoils.net/

Vagen, T-G. 2010. Africa Soil Information Service: Specific Catchment Area (SCA). Palisades, NY and Nairobi, Kenya: International Center for Tropical Agriculture - Tropical Soil Biology and Fertility Institute (CIAT-TSBF), World Agroforestry Centre (ICRAF), Center for International Earth Science Information Network (CIESIN), Columbia University. Available at http://africasoils.net/
Creation and Review Dates
DIF Creation Date: 2010-08-31
Last DIF Revision Date: 2010-09-28

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