United Nations. Food and Agricultural Administration (FAO)
Unprojected Latitude and Longitude
World Geodetic System 1984
The map shows the amount of area equipped for irrigation around the turn of the 20th century as a percentage of the total area on a raster with a resolution of 5 minutes. The area actually irrigated was smaller, but is unknown for most countries. A special note has to be made for Australia and India where the map shows the total area actually irrigated. This is due to the fact that statistics collected in Australia and India refer to actually irrigated area as opposed to statistics with area equipped for irrigation which are collected in most other countries. An explanation of the different terminology to indicate areas under irrigation is given in this glossary http://www.fao.org/nr/water/aquastat/irrigationmap/index20.stm.
The digital global map of irrigated areas is a raster map with a resolution of 0.5º by 0.5º (raster call area approx. 3000km2 at the equator, and 2100 km2 around 45º latitude). For the whole land area of the globe (except Antaractica), the data set provides the irrigation density in 1995. For many countries, no data on the total irrigated area exactly in the year 1995 are available, but for years between 1990 and 1995, and no correction was applied to these data The definition of controlled irrigation as used by FAO is followed (FAO, 1995). Flood recession cropping areas and cultivated wetlands are not included in the map.
A digital interactive map, a static global map, downloadable spatial data, and full metadata for each region are available on the website.
Includes various PDF files with maps, documentation and reports.
United Nations. Food and Agricultural Administration (FAO). Global Map of Irrigation Areas. [CD-ROM]. FAO Land and Water Digital Series #34, 2007.