Africa Irrigation Potential, Best soils, 1987

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Unknown
Publication_Date: Unknown
Title: Africa Irrigation Potential, Best soils, 1987
Description:
Abstract:
The Africa Irrigation Potential data set, which represents the best soils suitable for upland, is part of the FAO Irrigation and Water Resources Potential Database. The main input maps were the 1977 FAO/UNESCO Soil Map of the Africa, UNESCO Geological World Atlas (scale 1:10 m), Mean Annual Rainfall map from hand drawn FAO/AGS climate maps, Template with water related features, Administrative Units map, and Watersheds map. All maps, apart from where specified were at a scale of 1:5 million, and all in Miller Oblated Stereographic projection. The soil suitability for irrigation was determined by evaluating the properties of all soil components: dominant soil, associations and inclusions, phases, slope, drainage, and texture. The classification was done for two major crop types: lowland crops (flooded rice), and upland crops (for all other irrigated crops except the lowland crops). The soils source includes a list of attributes for each soil unit including: slope, drainage, texture and phase (re: UNEP/FAO/ESRI ITU 100004). Then for both cases (lowland crops (flooded rice), and upland crops (for all other irrigated crops except the lowland crops)), 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 constraints, S2 irrigation with some constraints, 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.
Purpose:
Not Available
Supplemental_Information:
Not Available
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: -20.0
East_Bounding_Coordinate: 55.0
North_Bounding_Coordinate: 40.0
South_Bounding_Coordinate: -35.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: PROJECT
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword: EARTH SCIENCE > AGRICULTURE > AGRICULTURAL ENGINEERING
Theme_Keyword: EARTH SCIENCE > AGRICULTURE > AGRICULTURAL PLANT SCIENCE > IRRIGATION
Theme_Keyword: EARTH SCIENCE > AGRICULTURE > SOILS
Theme_Keyword: EARTH SCIENCE > HUMAN DIMENSIONS > HABITAT CONVERSION/FRAGMENTATION > IRRIGATION > REGIONAL IRRIGATION
Theme_Keyword: EARTH SCIENCE > LAND SURFACE > SOILS
Theme_Keyword: GTOS > GLOBAL TERRESTRIAL OBSERVING SYSTEM
Theme_Keyword: Agriculture > Agricultural Practices > Irrigation
Theme_Keyword: Agriculture > Agricultural Practices > Irrigation Farming
Theme_Keyword: Crops
Theme_Keyword: Drainage
Theme_Keyword: Slope
Theme_Keyword: Texture
Theme_Keyword: Terrestrial Ecosystems > Soils
Theme_Keyword: FARMING
Theme_Keyword: ENVIRONMENT
Theme_Keyword: GEOSCIENTIFIC INFORMATION
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: CONTINENT > AFRICA
Access_Constraints: Public
Use_Constraints:
Not Available
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: JOHANNES AKIWUMI
Contact_Position: TECHNICAL CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Head, Data and Information Management Section
Address: Division of Early Warning and Assessment (DEWA)
Address: United Nations Environment Programme
Address: P. O. Box 30552
City: Nairobi
Postal_Code: 00100
Country: Kenya
Contact_Voice_Telephone: (+254-20) 7624214
Contact_Facsimile_Telephone: (+254-20) 7624315
Contact_Electronic_Mail_Address: Johannes.Akiwumi@unep.org
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Not Available
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: UNEP/GRID-NAIROBI > Global Resource Information Database - Nairobi, Division of Early Warning and Assessment, United Nations Environment Programme
Contact_Person: JOHANNES AKIWUMI
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Head, Data and Information Management Section
Address: Division of Early Warning and Assessment (DEWA)
Address: United Nations Environment Programme
Address: P. O. Box 30552
City: Nairobi
Postal_Code: 00100
Country: Kenya
Contact_Voice_Telephone: (+254-20) 7624214
Contact_Facsimile_Telephone: (+254-20) 7624315
Contact_Electronic_Mail_Address: Johannes.Akiwumi@unep.org
Resource_Description: NBId0211_101
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Not Available
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://gridnairobi.unep.org/
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date:
Metadata_Review_Date: 20120531
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: GCMD User Support Office
Contact_Organization: NASA Global Change Master Directory
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Not Available
City: Lanham
State_or_Province: MD
Postal_Code: 20706
Country: USA
Contact_Voice_Telephone: Not Available
Contact_Electronic_Mail_Address: gcmduso@gcmd.gsfc.nasa.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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