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CWANA: Vulnerability to drought

 

CWANA: Vulnerability to drought

Vulnerability to drought in Central and West Asia and North Africa (CWANA) during the period 1982-99

Metadata
Identification Information
Citation
Citation Information

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

2001

CWANA: Vulnerability to drought

raster digital data

http://gu.icarda.org/geocms/public/en/cms/metadata/index/433/CWANA%3A+Vulnerability+to+drought/

Description

Vulnerability to drought in Central and West Asia and North Africa (CWANA) during the period 1982-99

Detect the hotspots of land cover change, land degradation and drought vulnerability

Methodology: The mean and standard deviation of the 17 annual maximum NDVI were extracted in order to calculate the coefficient of variation (CV). The CV of the maximum NDVI is a measure of the fluctuations in agricultural or natural biomass: the higher the CV, the more responsive and therefore the more vulnerable the vegetation. To ensure that the CV does not result from land use changes, and hence is attributable to variations in climatic conditions, only CV-values for pixels with stable land cover over time were retained. In order to reduce noise and smoothen the map, a 3x3 median filter was applied. Finally, the missing pixels were filled up with a basic iterative interpolation technique. In different iterations, pixels without CV-values were replaced by the average of those neighbouring pixels, which had a CV-value (minimum of 2 neighbors), until all pixels obtained a CV-value. Only East Pakistan remained without values after 25 iterations.

Time Period of Content
Time Period Information
Single Date/Time

2001

publication date

Status

Complete

None planned

Spatial Domain
Bounding Coordinates

-17.103182

87.326399

55.450998

-1.662053

Keywords
Theme

land use

land cover

NDVI

drought vulnerability

Place

CWANA

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 Organization Primary

International Center for Research in the Dry Areas

ICARDA, Geoinformatics Unit

ICARDA, Geoinformatics Unit

Contact Address

mailing and physical address

ICARDA, P.O. Box 114/5055

Beirut

Beirut

Lebanon

+ 961 1 843472/813303

+ 961 1 804071/01-843473

icarda-gisu@cgiar.org

7.30 AM - 3.00 PM

Browse Graphic

http://geonet.icarda.cgiar.org/geonetwork/data/regional/CWANA/Thumbnail/Map08_vulnerability.jpg

Low Resolution (90dpi)

JPEG

Browse Graphic

http://geonet.icarda.cgiar.org/geonetwork/data/regional/CWANA/Thumbnail/Map08_vulnerability.tif

High Resolution (300dpi)

TIFF

Browse Graphic

http://geonet.icarda.cgiar.org/geonetwork/data/regional/CWANA/Doc/Report_CWANA.pdf

For additional details on the methodology, please refer to

PDF

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
Process Step

Creating the Metadata

2009

Spatial Data Organization Information

Raster

Raster Object Information

Grid Cell

857

1567

1

Spatial Reference Information
Horizontal Coordinate System Definition
Geographic

0.000000

0.000000

Decimal degrees

Planar
Planar Coordinate Information

row and column

Coordinate Representation

0.066643

0.066643

Geodetic Model

D_WGS_1984

WGS_1984

6378137.000000

298.257224

Entity and Attribute Information
Detailed Description
Entity Type

4change2.vat

Attribute

Rowid

Internal feature number.

ESRI

Attribute Domain Values

Sequential unique whole numbers that are automatically generated.

Attribute

VALUE

Attribute

COUNT

Distribution Information

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

5.168

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

20090812

Metadata Contact
Contact Information
Contact Person Primary

Francois Delobel

International Center for Research in the Dry Areas - ICARDA

Consultant, Geoinformatics Unit

Contact Address

mailing and physical address

ICARDA, P.O. Box 114/5055

Beirut

Beirut

Lebanon

+ 961 1 843472/813303

+ 961 1 804071/01-843473

f.delobel@cgiar.org

7.30 AM - 3.00 PM

FGDC Content Standards for Digital Geospatial Metadata

FGDC-STD-001-1998

local time

Metadata Security Information

Unclassified

metextns

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

ESRI Metadata Profile

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