Dryland map derived from the Aridity index map (P/PET).

Rift Valley fever is an OIE list A disease.The map shows the last reported outbreaks of Rift Valley fever in different countries of Africa and Middle East

Aridity index (P/Pet) derived from IDRISI file with continuous data, reclassified into 5 classes (+ water bodies). The IDRISI file was received by IIASA on February 2003.

Aridity index (P/Pet) derived from IDRISI file with continuous data, reclassified into 6 classes (+ water bodies); The 6th class indicates cold climate derived from Thermal climates (Boreal and Arctic) received from IIASA in 2002. The IDRISI file with Aridity values was received by IIASA on February 2003.