Africa FAO Irrigable Soil Classes (GIS Coverage)
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NBId0017_101
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Summary
Abstract:
New-ID: NBI17 Irrigable soils of Africa. The African Irrigable Soils Dataset documentation Files: IRRIGUT.E00 Code: 100050-001 IRRIGUB.E00 100050-002 IRRIGLT.E00 100050-003 IRRIGLB.E00 100050-004 Vector Members The E00 files are in Arc/Info Export format and should be imported with the ... Arc/Info command Import cover In-Filename Out-Filename. The African Irrigable Soils dataset is part of the FAO Irrigation and Water Resource Potential for Africa. The base map used was the UNESCO/FAO Soil Map of the World (1977), scale 1:5000000 and Miller Oblated Stereographic projection. All sources were re-registered to the basemap by comparing known features on the basemap and the source maps. The digitizing was done with a spatial resolution of 0.002 inches or 0.05 mm. The maps were then transformed from inch coordinates to latitude/ longitude degrees. The transformation was done by an unpublished algorithm (by US Geological Survey and ESRI) to create coverage"'"s for one-degree graticules. The source includes a list of attributes for each soil unit including: slope, drainage, texture and phase (re: UNEP/FAO/ESRI ITU 100004). All these components were used in the evaluation of potential irrigable soils. Criteria by FAO were established to estimate the proportion of each component soil which would meet irrigation requirements. This is done in two case. Criteria were established for: - Growing food crops under irrigation which is called upland crops; - Lowland crops, flooded rice. Then for both cases two maps were generated. One with all soils which are suitable, and one where slope, texture, drainage and phase were considered. Each different soil type is classed according to suitability, S1 irrigation with no constrains, S2 irrigation with some constrains, N1 not suitable without major improvements, N2 permanently not suitable. Because one soil unit can consist of more soil components (unit Af26-a can mean 30%Bf and 70% Af) the suitability is expressed in percentage of the unit that is suitable (1 >50% suitable, 2 = 25-50% etc.). Then the soil characteristics are used to refine the ranking. This refining is done were the original soil rank is increased decreased or changed from their original suitability to a new suitability (so or soil gets new class S1, N1 etc. or ranking changes like, -1 lower soil rank by one, +1 raise soil rank with one). The Ranking of Soils is as follows The soils considered not suitable are: Lithosols, Arenosols, Rendzinas, Yermosols, Podzols, Thionic Fluvisols, Miscellaneous land units such as rock debris, desert debris, Gypsum units, Soils with stonic, lythic or petrogypsic phase. Ranking by Drainage conditions All crops Lowland Fluvisols and Histosols 50% S1, 50% S2 50% S1, 25% S2 , 25% N1 Gleysols and Gleyic units 50% S2, 50% N2 50% S1, 50% N2 (except Cambisols) Gleyic Cambisols 100%S2 100%S1 Planosols 50% S1, 50% N2 50% S1, 50% S2 Ranking by Special conditions Calcaric units 50% S1, 50% S2 50% S2, 50% N2 Vertisols 50% S2, 50% N2 100% S2 Acrisols,Nitiosols,Ferrasols -1 -1 Solonchalks,Solonetz -1 -1 Thionic Fluvisols 100% N2 100% S1 Ranking of Slope conditions All crops Lowland crops 0-8% Fluvisols,Gleysols,Gleyic unit no change no change All other soils 50% S2, 50% N1 50% S2, 50% N1 8-30% all Soils 100% N1 100% N2 >30% all Soils 100% N2 100% N2 Ranking of Soil Texture conditions Coarse textured 25% S2, 75% N2 100% N2 Medium textured no change no change Fine textured -1 no change Contact : FAO, Land and Water Development Division via Delle Terme di Caracalla, 00100, Rome, Italy Att: Mr. Thomas The IRRIGUT file shows all soils that are irrigable for upland crops. The IRRIGUB file shows soils that are irrigable for upland crops, ranked by slope etc. The IRRIGLT file shows all soils that are irrigable for lowland crops The IRRIGLB file shows soils that are irrigable for lowland crops, ranked by slope etc. References: ESRI. Final Report UNEP/FAO world and Africa GIS data base. (1984). Internal Publication byESRI, FAO and UNEP FAO, UNESCO. Soil Map of the World (1977). Scale 1:5000000. UNESCO, Paris UNESCO. Geological Map of Africa (1975). Scale 1:1000000 FAO. Irrigation and Water Resource Potential for Africa. (1987) Publication FAO, AGL/MISC/11/87. Rome, Italy Source : FAO Soil Map of the World, scale 1:5000000 Publication Date : Nov1987 Projection : Miller Type : Vector Fromat : Arc/Info export non-compressed Related Datasets : All UNEP/FAO/ESRI Datasets ITU08-10 (100004) - Integrated Terrain Units AQRANK, AQRANKSM (100046) WATERBALLX FAO (100053) - Waterbalance CROPS2 (100013) - Crops by administrative unit ADMIN (100012) - Administrative units WSHDLL (100018) - Watersheds RAINFALL (100009) - Mean Annual rainfall SOILS FAO/Unesco soil map (100007) Comments : No boundary (outline) for Africa.
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Description:
Search and access the data from the UNEP Environmental Data Explorer.
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Geographic Coverage
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Spatial coordinates
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N: 40.0
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S: -45.0
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E: 60.0
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W: -30.0
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Access Constraints
Data Access Policy As a member of the Long Term Ecological Research Network, the Georgia Coastal Ecosystems LTER Program is committed to providing access to data collected under the auspices of our project in a timely fashion. Study results will be published in the scientific literature, and documented data sets and other information will be provided on the World ... Wide Web for legitimate scientific and educational purposes. Access to GCE resources varies by resource type and user affiliation, and requires acceptance of the GCE LTER Data Use Agreement. Descriptions of the basic data access categories used to classify each resource are as follows: Category Description Maximum waiting period Type 1 Public resources, including most GCE metadata, data from published studies, literature citations, and conference presentations. May also include special reports or unpublished treatments of public data sources. none Type 2 Project resources, including data from GCE core monitoring activities, presentations made at project meetings, and metadata containing proprietary information. 1 year from the end of observations or data analysis Type 3 Proprietary resources, including data from individual directed studies or student projects supported by GCE funds, and resources contributed by GCE-affiliated research programs. 2 years from the end of observations or data analysis Type 4 Sensitive resources, including data sets subject to proprietary or copyright restrictions, containing classified information, or containing information that may compromise the protection of endangered species or habitats. (Note: submission of type 4 data requires written justification and prior approval by the GCE Project Administrator). Specified by Contributor 
Use Constraints
All publications based on this data set must cite the contributor and Georgia Coastal Ecosystems LTER project, and two copies of the manuscript must be submitted to the GCE-LTER Information Management Office.
Data Set Progress
COMPLETE
Personnel
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DIF AUTHOR
Phone:
(301) 614-6898
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301-614-5268
Email:
Tyler.B.Stevens at nasa.gov
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NASA Goddard Space Flight Center
Global Change Master Directory
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Greenbelt
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MD
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USA
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TECHNICAL CONTACT
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(706) 542-5955
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(706) 542-5888
Email:
sheldon at arches.uga.edu
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Department of
Marine Sciences
University of Georgia
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Athens
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GA
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30602-3636
Country:
GEORGIA
Role:
TECHNICAL CONTACT
Fax:
(706) 542-5888
Email:
tdbish at uga.edu
Contact Address:
Dept. of Marine Sciences
University of Georgia
City:
Athens
Province or State:
Georgia
Postal Code:
30602-3636
Country:
USA
Creation and Review Dates
DIF Creation Date:
2004-06-11
Last DIF Revision Date:
2004-07-02
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