Al Kharj in 1972
Al Kharj in 1972USGS (Riyadh, Landsat 1 MSS, 24 September 1972)

Source U.S. Geological Survey 


Al Kharj in 1990
Al Kharj in 1990 The red circles are fields with center-pivot irrigation systems, drawing water from Saudi Arabia's aquifers. This irrigation development resulted from the investment of part of Saudi Arabia's oil revenues in an effort to modernize agriculture.

Source U.S. Geological Survey 

USGS (Riyadh, Landsat 4 TM, 31 August 1990)

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September 02, 2001