Barnegat Bay, NJ (M070) Bathymetric Digital Elevation Model(30 meter resolution) Derived From Source Hydrographic SurveySoundings Collected by NOAA

Bathymetry for Barnegat Bay was derived from six surveys containing74,448 soundings. No surveys were deleted. The average separationbetween 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 lowwater. Mean high water values of 0.8 or 0.9 meters were assigned to the shoreline. No individualpoints 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 1degree DEMs were generated from the higher resolution 7.5 minute DEMswhich covered the estuary. A Digital Elevation Model (DEM) contains aseries of elevations ordered from south to north with the order ofthe columns from west to east. The DEM is formatted as one ASCIIheader record (A- record), followed by a series of profile records(B- records) each of which include a short B-record header followedby a series of ASCII integer elevations (typically in units of 1centimeter) per each profile. The last physical record of the DEM isan accuracy record (C-record).The 7.5-minute DEM (30- by 30-m data spacing) is cast on theUniversal Transverse Mercator (UTM) projection. It provides coveragein 7.5- by 7.5-minute blocks. Each product provides the samecoverage as a standard USGS 7.5-minute quadrangle but the DEMcontains over edge data. Coverage is available for many estuaries ofthe contiguous United States but is not complete.