The inundation data displayed in this map viewer were developed by K. Van Wilson,
P.E., at the USGS Mississippi Water Science Center.
The inundation zones were derived from a 3-meter resolution light detection and ranging
(lidar)-based digital elevation model (DEM). The DEM is referenced to the North American
Vertical Datum of 1988. All cells in the DEM grid below
1 to 6-foot thresholds were designated as inundated by potential sea-level rise
regardless of hydrologic connectivity, which is similar to a "bath-tub" model.
The map viewer does not provide inundation data for Mississippi's barrier islands.
The population map overlay depicts population counts from the year 2010 within U.S.
Census Bureau blocks. This information was included to help identify locations where
large numbers of residents are vulnerable to inundation by potential sea-level rise.