ABSTRACT.The Spring 1973 Mississippi River flood was investigated using remotely sensed data from ERTS‐1. Both manual and automatic analyses of the data indicate that ERTS‐I is extremely useful as a regional tool for flood management. Quantitative estimates of area flooded were made in St. Charles County, Missouri and Arkansas. Flood hazard mapping was conducted in three study areas along the Mississippi River using pre‐flood ERTS‐1 imagery enlarged to 1:250,000 and 1:100,000 scale. The flood prone areas delineated on these maps correspond to areas that would be inundated by significant flooding (approximately the 100 year flood). The flood prone area boundaries were generally in agreement with flood hazard maps produced by the U. S. Army Corps of Engineers and U. S. Geological Survey although the latter are somewhat more detailed because of their larger scale. Initial results indicate that ERTS‐1 digital mapping of flood prone areas can be performed at 1:62,500 which is comparable to some conventional flood hazard m
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