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A Tampa Bay Bathymetric / Topographic Digital Elevation Model With Internally Consistent Shorelines for Various Datums

In a joint demonstration project for the Tampa Bay region, the National Oceanic and Atmospheric Administration (NOAA) and the U.S. Geological Survey (USGS) have blended their bathymetric and topographic data sets (respectively) into a digital elevation model (DEM) with all data initially referenced to the ellipsoid. A datum transformation tool allows easy transformation of elevations with respect to any of 26 orthometric, 3-D, or tidal datums. The geographic distribution of particular tidal datums (relative to mean sea level) was produced using a calibrated and verified numerical hydrodynamic model of Tampa Bay. This datum transformation tool was used to transform all bathymetric data from a mean lower low water datum (or from a mean low water datum for older data) to the ellipsoid. For areas where low water and high water shorelines are significantly different, an ultimate objective will be to incorporate a higher-resolution “shoreline zone” into the DEM, so that various internally consistent “shorelines” can be generated by moving the water level in the DEM to the desired tidal datum heights. The bathymetric/topographic DEM will not only solve the problem of inconsistency between NOAA and USGS shorelines that have caused difficulty for a variety of mariners and coastal managers, but it will also provide a standard DEM on which other thirdparty bathymetric and topographic data can be appended, as well a great variety of geospatial data layers. The applications benefitting from the bathy/topo DEM range from electronic nautical charts to improved storm surge modeling to better sea grass (and other habitat) restoration projects.