Update of the Digital Global Map of Irrigation Areas (GMIA) to Version 5
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This report describes the update of the Digital Global Map of Irrigation Areas to version 5. For this update, the inventory of subnational irrigation statistics was updated with new information derived from national census surveys or irrigation sector studies. For the first time, the global map of irrigation areas also contains data layers on the percentage of area equipped for irrigation that is actually irrigated and on the source of irrigation water: groundwater, surface water, water from non-conventional sources.