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Tampa Bay Topographic/Bathymetric Digital Elevation Model

In this joint demonstration project for the Tampa Bay region, NOAA's National Ocean Service (NOS) and the U.S. Geological Survey (USGS) have merged NOAA bathymetric and USGS topographic data sets into a hybrid digital elevation model (DEM) with all data initially referenced to the ellipsoid, but transformable to any of 28 orthometric, 3-D, or tidal datums.

Cite this dataset when used as a source.

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Distribution Formats
  • binary float (Version: 1)
    • File Compression: WINZIP
Distributor Distributor information not available
Point of Contact Dean Gesch
United States Geological Survey (USGS), Earth Resources Observation Systems (EROS) Data Center
Documentation links not available.
  • United States Geological Survey, Earth Resources Observation Systems (EROS) Data Center
  • National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office of Coast Survey (OCS), Coast Survey Development Laboratory (CSDL)
  • U.S. Geological Survey, EROS Data Center; and NOAA's Ocean Service, Office of Coast Survey (OCS)
  • publication: 2001-04-05
Data Presentation Form: mapDigital
Dataset Progress Status Complete
Data Update Frequency: As needed
Purpose: This dataset is intended for geospatial applications that require seamless land elevation and water depth information in coastal environments.
Use Limitations
  • While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
Time Period: 1945-01-01  to  1999-01-01
Spatial Reference System: urn:ogc:def:datum:EPSG::5103
Spatial Bounding Box Coordinates:
N: 28.125000
S: 27.375000
E: -82.375000
W: -82.875000
Spatial Coverage Map:
  • Earth Science > Oceans > Bathymetry/Seafloor Topography > Seafloor Topography
  • Earth Science > Oceans > Bathymetry/Seafloor Topography > Bathymetry
  • Earth Science > Oceans > Bathymetry/Seafloor Topography > Water Depth
  • Earth Science > Land Surface > Topography > Terrain Elevation
  • Earth Science > Land Surface > Topography > Topographical Relief Maps
  • Earth Science > Oceans > Coastal Processes > Coastal Elevation
  • DEM > Digital Elevation Model
  • V: < 1 meter
  • bathymetry/topography
  • United States
  • Tampa Bay
  • Florida
Use Constraints
  • Use Constraints: Because the source bathymetric and topographic data vary in density and accuracy, users need to be made aware of the spatially varying quality of the merged model. In some areas, the spacing of the soundings would support gridding at a much higher resolution than 1-arc second, where in other areas the values of the 1-arc-second grid were interpolated based only on distant points. Likewise, the vertical accuracy of the model varies spatially, due mainly to the wide variety of dates and data collection technologies used for source data acquisition. A merged raster model at a uniform grid cell spacing was produced because most users require such a product for their computer mapping systems.
Access Constraints
  • Access Constraints: None
  • None
Source Datasets
  • GEODAS Hydrographic Survey Database
    • Description of Source: Source Contribution: Bathymetric data was used to develop a seamless bathymetric/topographic DEM for the Tampa Bay region. Source Type: CD-ROM
    • Temporal extent used:  1945-01-01  to  1996-01-01
  • USGS National Elevation Dataset NED
    • Description of Source: Source Contribution: Topographic data was used to develop a seamless bathymetric/topographic DEM for the Tampa Bay region. Source Type: CD-ROM
    • Temporal extent used:  unknown  to 
Lineage Statement Lineage statement not available.
Processing Steps
  • A seamless bathymetric/topographic digital elevation model (DEM) was developed by merging the "best available" bathymetric data from NOAA and topographic data for USGS. Each of the datasets was initially processed independently to apply the "best available" criteria to select the data to be merged. Prior to merging, the selected data were transformed to a common reference coordinate system, both horizontally and vertically.The selected topography points within the shoreline buffer zone and the bathymetry points were gridded to produce a raster surface model with a 1-arc-second grid spacing to match the resolution of NED. The points were input to an implementation of the ANUDEM thin plate spline interpolation algorithm, which is optimized for generation of topographic surfaces. The bathymetry points could have been gridded independently of the topographic data, but the shoreline zone land elevations were included in the interpolation to ensure a better match of the bathymetric and topographic surfaces for the subsequent mosaicing step. To avoid introduction of any interpolation edge effects into the merged elevation model, the output grid from the interpolation was clipped to include only land elevations within 300 meters of the shoreline. The final processing step involved the mosaicing of the bathymetry grid and the NED elevation grid. The values in the 300-meter overlap area were blended by weighted averaging, where the weights for each grid are determined on a cell-by-cell basis according to the cell's proximity to the edges of the overlap area. The resulting final merged product is a seamless bathymetric/topographic model covering the Tampa Bay region at a grid spacing of 1-arc-second. The vertical coordinates represent elevation in decimal meters relative to the GRS80 ellipsoid, and the horizontal coordinates are decimal degrees of latitude and longitude referenced to the NAD83 datum.Process Date Range is 2000 - 2001
Processing Environment Native Dataset Environment: ESRI ArcInfo 8.0

Metadata Last Modified: 2015-09-03

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