Tsunami Inundation DEM Project 2008-10-31 publication mapDigital NOAA Coastal Inundation DEMs Named by primary coastal city, state in DEM. NOAA's National Centers for Environmental Information (NCEI) is building high-resolution digital elevation models (DEMs) for select U.S. coastal regions to support inundation modeling and community mitigation and resiliency efforts. These integrated bathymetric-topographic DEMs support tsunami forecast and warning from NOAA's Tsunami Warning Centers. The DEMs are used in the MOST (Method of Splitting Tsunami) model developed by NOAA's Pacific Marine Environmental Laboratory (PMEL) to simulate tsunami generation, propagation, and inundation. Bathymetric, topographic, and shoreline data used in DEM compilation are obtained from various sources, including federal and academia data archived at NCEI, the U.S. National Ocean Service (NOS), the U.S. Geological Survey (USGS), the U.S. Army Corps of Engineers (USACE), the Federal Emergency Management Agency (FEMA), and other federal, state, and local government agencies, academic institutions, and private companies. DEMs are referenced to the vertical tidal datum of Mean High Water (MHW) and horizontal datum of World Geodetic System 1984 (WGS84). Depending on the user requirements and available data, grid spacings for the DEMs range from 1/3 arc-second (~10 meters) to 3 arc-seconds (~90 meters). largerWorkCitation