What is the scale of IWMI’s Global Irrigated Area Map (GIAM)?
There are wide array of scales or pixel resolutions used and they vary between 100-m to 10-km- even though it is realistic to say the scale is between 1-10km. The overwhelming proportion of the Global data used in the study is 10-km AVHRR. The 1-km SPOT vegetation data has been used for the entire World as well. The secondary data, which covered the entire World, of elevation and forest cover were in 1-km, rainfall at 50-km, and temperature at 10-km. The 100-m JERS SAR data was used only for the rainforests of Africa and South America.
