Prior to the flood, only a few cities including New Orleans had a high resolution lidar elevation map. In this image we see the high resolution elevation data of New Orleans after the Hurricane. The lidar map available before the flood helped specialists create maps on innundation even quicker and aided a quicker response and recovery efforts. In the days following the storm, people in New Orleans demanded maps containing this data so they could see which parts were mostly flooded.
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.