Publications for Tampa Bay Project Spatial Data & Visualizations Bathy/Topo DEM Development VDatum for Tampa Bay Tidal Datum Modeling for Tampa Bay Tampa Bay Bathy/Topo/Shoreline Project Home http://mapping.usgs.gov http://www.nos.noaa.gov/

Spatial Data & Visualizations

Raster and Nautical Chart Layers

Merged Bathy-Topo DEM
A 30 m and a 10 m Topo-Bathy DEM for Tampa Bay consists of topobathy_ft in ESRI ArcGRID format, with z units in feet, vertical datum in NAVD 88, and the horizontal datum is NAD 83(86).   Download: 30m_topobathy_ft.zip (25MB); fthires_ws.tar.gz (119MB); metadata 		Raster Nautical Charts
Raster Nautical Charts (RNCs) were employed as a base layer for marine GIS. Nautical charts were reprojected to horizontal datum NAD 83(86), so that the soundings could be compared to the gridded depths. The charts' BSB KAP format can be viewed in ESRI ArcView 3 using the Nautical Chart Viewer extension. More information about RNCs can be found at Link to RNC information. Download: rastercharts.zip (7MB)

Vector Shoreline Data

Shoreline from NOAA Topographic Survey Sheets
NOAA vector shoreline data was used to delineate shoreline boundary and to process nearshore bathymetry. The data are in ESRI shapefile format.  
Download: NOAA_T-Sheet.zip (11MB) 		Shoreline from High Resolution NOAA Charts
High resolution vector shoreline data (MHW, MLW) extracted from recent NOAA nautical charts are available in ESRI shapefile format.  
Download: Chart (MHW_MLW).zip (<1MB)

Bathymetry Data

NOAA Bathymetry
Original vertical datums have been converted to a common tidal datum (MLLW) and transformed to the ellipsoid NAD 83(86). After building the DEM, the bathymetric vertical datum was converted to NAVD 88.
The data are in ESRI shapefile format.  
Download: Original Datum (16MB); MLLW (13MB); NAD 83(86) (12MB); NAVD 88 (19MB) 		GIS Conversion Utilities
ESRI ArcAvenue scripts were developed to convert NOAA bathymetry data from GEODAS HYD93 text files into ESRI point shapefile format in geographic coordinates (input_soundings.ave), and to convert ESRI point shapefiles (SurveyID, x, y, z) to ASCII text input for the VDatum Transformation Tool (shp2vdata.ave).

Visualizations

Tampa Bay Fly-By
A 3D fly-through of the best available NOAA bathymetry and USGS digital elevation data for Tampa Bay was generated in IVS Fledermaus software using 55 mm grid spacing and 17 cell tapered weighting function. View tampa.mpg (1.5 MB).

3-D fly-through of Tampa Bay-- 1.5MB download

Tampa Bay SLOSH Model
The Sea Land and Overland Surges from Hurricanes (SLOSH) model, run by NOAA's National Weather Service and National Hurricane Center (NHC), estimates storm surge heights and winds from 'historical, hypothetical, or predicted' hurricanes. Satellite imagery and the Bathy-Topo DEM were integrated to predict flood zones and storm surge produced by a tropical storm and hurricane. View slosh.mov (4.4 MB).

SLOSH of Tampa bay-- 4.4MB download

Graphics

NOAA/USGS Merged Bathy-Topo DEM
A merged Topo-Bathy DEM was produced at a 1-arc-second and one-third arc-second resolution. High resolution grids were created from the same source data as the 1-arc-second grids. Because the density of soundings supports higher resolution grid spacing, the interpolated grid show improves bathymetric detail with sounding density.

Image of merged NOAA/USGS DEM

NOAA Hydrographic Survey Indexes
Forty-seven NOAA hydrographic survey indexes were constructed into polygons, imported into a GIS. Polygons were sorted by date, merged with other survey polygons, and edited and cleaned. As a result, fifteen master spatial-temporal indexes were produced showing the spatial extent of the most current bathymetry in Tampa Bay. The master polygons were then used to select soundings from the original hydrographic surveys using an inside/outside polygon clipping routine.

Image of Hydrographic Survey Locations Image of Hydrographic Survey Indexes Image of soundings selection by polygon clipping

NOAA Bathymetry
The best available bathymetry from NOAA surveys was extracted from the NOS Hydrographic Survey Database. Soundings were converted from multiple vertical chart datums to the ellipsoid using the VDatum Transformation Tool developed by the Office of Coast Survey and National Geodetic Survey (NGS). About 800,000 soundings from forty-seven hydrographic surveys conducted from 1945-1996 were selected and clipped by a spatial-temporal index used as a filter to create a seamless bathymetry for Tampa Bay.

Image of Bathy Grid Image of Bathy Grid

USGS Digital Elevation Model
The best available digital elevation data was extracted from the USGS' National Elevation Dataset (NED). Elevation data was converted to the ellipsoid and registered with VERTCON and GEOID99.

Image of USGS NED Image of USGS 30m DEM

Flow Diagram for Processing Bathy-Topo GIS
A methodology was developed to extract the best available NOAA bathymetry and USGS digital elevation data, transform elevation data (soundings and heights) to the ellipsoid, interpolate bathymetric GRID data and merge it with the elevation GRID. A final merged GRID was developed at a 10 m and 30 m resolutions in several vertical datums (NAVD 88, MLLW, ellipsoid) and elevation units (meters and feet). A key component is the VDatum Transformation Tool, which converts height data into a common reference.

Image of Data Flow Diagram

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U.S. Department of Commerce > NOAA > NOS > Office of Coast Survey

Revised Saturday October 22 2005