Project information Title: Global Irrigated Area Mapping URL: http://www.iwmidsp.org Period: 2003 - 2005 Description: Beta version of Global Map of Irrigated Area has been produced using 20 years of data, at 10 day intervals, with 10 km pixel resolution (AVHRR), combined with: global 1km Spot Vegetation data (monthly); JERS 1 radar data (at 100m pixel scale), covering the main forest areas of South America and Central Africa; plus GeoCover 2000 data (nominally 15m, re-sampled to 150m). 628 unique land cover classes have been identified, and various innovative procedures and techniques have been used to classify them. Ground-truth data obtained in India, SE Asia, Africa and South America has been used to refine the classes. The Beta release map shows 53 irrigated classes, derived from the 628 classes in the master file. This Beta release is being disseminated to obtain feedback on the spatial accuracy and definition of irrigated areas. At the moment, we present only the spatial distribution of irrigated areas. Every irrigated area pixel has different degree (% area) irrigated. In order to establish this, we are currently working on a “sub-pixel decomposition technique” which will precisely establish what percentage of a pixel is irrigated. The study will establish the precise areas irrigated season by season for the entire globe, taking each irrigated area class at a time. We have 2 unique methods under evaluation and are currently working to establish precise areas in version 1.0 Contact: Keyword: vegetation hydrology pumps wells canals dams biodiversity conservation irrigation wetlands rain water lakes rivers groundwater "best practices" modelling 2000- Institutions: International Water Management Institute Researchers: Biradar, Chandrashekhar Thenkbail, Prasad Turral, Hugh Literature

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updated: 2003-11-17 Print version