Bathymetry.

Bathymetric information came from three sources (figure 3.5). For most of the bay, a digital file was used of point data from pre-1953 National Ocean Service (NOS) survey. Since much of the shoreline and in-shore bottom characteristics have changed in subsequent decades (figures 1.3 and 1.4), a field survey of centerline channel depth was conducted by Antonini and Box (1996). Information on the Intercoastal Waterway (ICW) channels was obtained from the U.S. Army Corps of Engineers (COE).

  

Figure 3.6: Bathymetry

Shoreline and bathymetric data were combined as input data for a triangulated irregular network (TIN) model of the bay bottom. This three-dimensional representation of the bay was converted to a lattice of 10m² resolution using Arc/INFO's TINLATTICE command, and this lattice was imported into GRASS©GIS as a digital elevation model. A summary of bathymetric information is presented in figure 3.6.