The figure above shows the elevation data collected using Lidar. This representation shows Lake Pontchartrain and the Mississippi River to be higher than the land in the middle of the city, which is referring to the bowl shape of New Orleans. Often Lidar incorrectly measures areas over water, so the elevation of the water surface is inferred with areas surrounding it.
I have acted with honesty and integrity in producing this work and am unaware of anyone who has not. Nataley Ford
Gesch, D. (2005). Topography-based analysis of Hurricane Katrina inundation of New Orleans. Science and the Storms: the USGS Response to the Hurricanes of, 53-56.