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New Orleans, Louisiana FEMA floodmap
Created by Shawn and the Google Earth Current Events Community using the superimposition technique.
Shawn says, FEMA published a map of flooded areas. The overlay is http://tehsquee.com/NOLA_FEMA_FloodMap.kmz. It's slightly off due to differences in projection between Google Earth,
and the map projection they used in (Probably a GIS software named
MapInfo)
But it gives a good idea. I guess that's my usual disclaimer.