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NOAA's National Geophysical Data Center (NGDC) is building high-resolution digital
elevation models (DEMs) for select U.S. coastal regions. These integrated bathymetric-topographic
DEMs are used to support tsunami forecasting and modeling efforts at the NOAA Center
for Tsunami Research, Pacific Marine Environmental Laboratory (PMEL). The DEMs are
part of the tsunami forecast system SIFT (Short-term Inundation Forecasting for Tsunamis)
currently being developed by PMEL for the NOAA Tsunami Warning Centers, and are used
in the MOST (Method of Splitting Tsunami) model developed by PMEL to simulate tsunamigeneration,
propagation, and inundation. Bathymetric, topographic, and shoreline data used in
DEM compilation are obtained from various sources, including NGDC, the U.S. National
Ocean Service (NOS), the U.S. Geological Survey (USGS), the National Aeronautic Space
Administration (NASA), and other federal, state, and local government agencies, and
academic institutions. DEMs are referenced to the vertical tidal datum of Mean High
Water (MHW) and horizontal datum of World Geodetic System 1984 (WGS84). Grid spacings
for the DEM is 1 arc-second (30m). |