| Barnegat Bay, NJ (M070) Bathymetric Digital Elevation Model (30 meter resolution)
Derived From Source Hydrographic Survey Soundings Collected by NOAA |
| Bathymetry for Barnegat Bay was derived from six surveys containing 74,448 soundings.
No surveys were deleted. The average separation between soundings was 49 meters. The
six surveys dated from 1934 to 1936. The total range of sounding data was 0.3 meters
to -14.3 meters at mean low water. Mean high water values of 0.8 or 0.9 meters were
assigned to the shoreline. No individual points were deleted. DEM grid values outside
the shoreline (on land) were assigned null values (-32676). Barnegat Bay has eight
7.5 minute DEMs and two one degree DEMs. The 1 degree DEMs were generated from the
higher resolution 7.5 minute DEMs which covered the estuary. A Digital Elevation Model
(DEM) contains a series of elevations ordered from south to north with the order of
the columns from west to east. The DEM is formatted as one ASCII header record (A-
record), followed by a series of profile records (B- records) each of which include
a short B-record header followed by a series of ASCII integer elevations (typically
in units of 1 centimeter) per each profile. The last physical record of the DEM is
an accuracy record (C-record). The 7.5-minute DEM (30- by 30-m data spacing) is cast
on the Universal Transverse Mercator (UTM) projection. It provides coverage in 7.5-
by 7.5-minute blocks. Each product provides the same coverage as a standard USGS 7.5-minute
quadrangle but the DEM contains over edge data. Coverage is available for many estuaries
of the contiguous United States but is not complete. |
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