Geoinformatics Solutions for Integrated Agro-ecosystems Research 

Central Asia: Annual Aridity Index

 

Central Asia: Annual Aridity Index

Annual Aridity Index for Central Asia at 30 arc-second ( about 1 km) resolution

Metadata
Identification Information
Citation
Citation Information

International Center for Agricultural Research in the Dry Areas (ICARDA)

2008

Central Asia: Annual Aridity Index

raster digital data

De Pauw, E. 2008. ICARDA Regional GIS Datasets for Central Asia: Explanatory Notes. GIS Unit Technical Bulletin. International Center for Agricultural Research in the Dry Areas (ICARDA), Aleppo, Syria.

http://gu.icarda.org/geocms/public/en/cms/metadata/index/17/Central+Asia%3A+Annual+Aridity+Index/

Description

Annual Aridity Index for Central Asia at 30 arc-second ( about 1 km) resolution

To provide a measure of aridity for specific locations using an index

The annual aridity index is the ratio of annual precipitation over annual potential evapotranspiration (dimensionless unit).

Time Period of Content
Time Period Information
Range of Dates/Times

1961

1987

ground condition

Status

Complete

Irregular

Spatial Domain
Bounding Coordinates

46.491856

87.308524

55.424429

35.141094

Keywords
Theme

REQUIRED: Reference to a formally registered thesaurus or a similar authoritative source of theme keywords.

climate

aridity index

arid zones

UNESCO

Place

Central Asia

Tajikistan

Turkmenistan

Kazakhstan

Uzbekistan

Kyrgyzstan

Open access policy: reproduction and distribution of this dataset is allowed subject to proper citation (see citation information)

Fair use policy: commercialization of this dataset is not allowed. No constraints on use in applications, whether for commercial or non-profit.

Point of Contact
Contact Information
Contact Person Primary

ICARDA, Geoinformatics Unit

ICARDA

ICARDA, Geoinformatics Unit

+963-21-2213433

+963-21-2169-2470

icarda-gisu@cgiar.org

Browse Graphic

http://192.168.71.208/geonetwork/data/regional/cacilm/AEZ/thumbnail/AI_Year_A3.jpg

Map showing 8 ranges for the annual aridity index. Created by map export from a ArcGIS project using A3 size and 90 dpi

JPEG

Browse Graphic

http://192.168.71.208/geonetwork/data/regional/cacilm/AEZ/map/AI_Year_A3.tif

Annual Aridity Index classified into 5 classes (arid, semi-arid, sub-humid, humid, per-humid). Created by map export from a ArcGIS project using A3 size and 300 dpi

TIFF

Bashar Nseir, Layal Atassi, and Fawaz Tulaymat have been involved at one time or another in the GIS processing of this and similar datasets of the GIS Unit

Security Information

Unclassified

Cross Reference
Citation Information

UNESCO

Map of the world distribution of arid regions

UNESCO, 1979. Map of the world distribution of arid regions. Map at scale 1:25,000,000 with explanatory note. United Nations Educational, Scientific and Cultural Organization, Paris, 54 pp. ISBN 92-3-101484-6

http://www.worldclim.org

Data Quality Information
Attribute Accuracy

Data values for all stations have been checked for plausibility

Positional Accuracy
Horizontal Positional Accuracy

Geographical accuracy of all stations has been checked

Vertical Positional Accuracy

Elevation accuracy for all stations has been checked against GTOPO30 DEM

Lineage
Source Information
Source Citation
Citation Information

Uzbekistan HydroMetService

Monthly Reference Book on Meteorology Vol 19: Uzbekistan 1961-1987

Source Information
Source Citation
Citation Information

Turkmenistan HydroMetService

Monthly Reference Book on Meteorology Vol 30: Turkmenistan 1961-1987

Monthly Reference books on Meteorology

Source Information
Source Citation
Citation Information

Tajikistan HydroMetService

Monthly Reference Book on Meteorology Vol 31: Tajikistan 1961-1987

Monthly Reference books on Meteorology

Source Information
Source Citation
Citation Information

Kyrgyzstan HydroMetService

Monthly Reference Book on Meteorology Vol 32: Kyrgyzstan 1961-1987

Monthly Reference books on Meteorology

Source Information
Source Citation
Citation Information

Kazakhstan HydroMetService

Monthly Reference Book on Meteorology Vol 18: Kazakhstan 1967-1987

Monthly Reference books on Meteorology

Process Step

Based on the ratio of the annual precipitation over annual potential evapotranspiration. The classes follow the UNESCO system used in their map of the arid regions of the world: 'hyper-arid' (AI <0.03, not present in Central Asia), 'arid (AI between 0.03 and 0.2), 'semi-arid' (AI between 0.2 and 0.5), 'sub-humid' (AI between 0.5 and 0.75), 'humid' (AI between 0.75 and 1), For more details on this system see cross-reference. A 6th aridity class 'per-humid' (aridity index >1) has been added to cover more humid climates. For more details is referred to the citation (De Pauw, 2008).

Spatial Data Organization Information

Raster

Raster Object Information

Grid Cell

2434

4898

1

Spatial Reference Information
Horizontal Coordinate System Definition
Geographic

0.000000

0.000000

Decimal degrees

Planar
Planar Coordinate Information

row and column

Coordinate Representation

0.008333

0.008333

Geodetic Model

D_WGS_1984

WGS_1984

6378137.000000

298.257224

Entity and Attribute Information
Detailed Description
Entity Type

acz_casia.vat

Attribute

Rowid

Internal feature number.

ESRI

Attribute Domain Values

Sequential unique whole numbers that are automatically generated.

Attribute

VALUE

Attribute

COUNT

Distribution Information
Distributor
Contact Information
Contact Person Primary

Eddy De Pauw

ICARDA

Head GIS Unit

+963-21-2213433

+963-21-2169-2470

e.de-pauw@cgiar.org

Downloadable Data

ICARDA declines all responsibility for errors or deficiencies in the database or in the documentation accompanying it, for maintenance or for updating the database. Users are however kindly requested to report any errors or deficiencies in this product to ICARDA.ICARDA is no authority on country boundaries and follows UN practice regarding country boundary location, as indicated on the United Nations Cartographic Website: http://www.un.org/Depts/Cartographic/english/htmain.htm

Standard Order Process
Digital Form
Digital Transfer Information

47.651

ArcGIS, or ArcView with Spatial Analyst extension. Metadata can be read directly in ArcCatalog or in a Web browser using the HTML pages provided separately.

Metadata Reference Information

20090127

Metadata Contact
Contact Information
Contact Person Primary

Eddy DE PAUW

International Center for Agricultural Research in Dry Areas (ICARDA)

Consultant, Geoinformatics Unit

Contact Address

mailing address

ICARDA, P.O. Box 114/5055

Beirut

Beirut

REQUIRED: The ZIP or other postal code of the address.

Lebanon

+963-21-2213433

+963-2169-2470

e.de-pauw@cgiar.org

FGDC Content Standards for Digital Geospatial Metadata

FGDC-STD-001-1998

local time

None

None

metextns

http://www.esri.com/metadata/esriprof80.html

ESRI Metadata Profile

User Registrationclose[x]

















User Login

Forget password? | New User

Messageclose[x]

Message Body Goes Here

Messageclose[x]

Profile page goes here

Data Requestclose[x]

Data Requestclose[x]