Bathymetry of Hog Island Bay of the Virginia Coastal Reserve 1997-1999

This dataset contains a grid describing the bathymetry of Hog Island Bay. It is based on interpolation of over 10,000 individual depth soundings. An Innerspace Technologies digital depth sounder provided the depth data. A GPS unit with real-time NAVbeacon corrections (est. accuracy 5 meters) was used to provide locations. Data was corrected for tidal changes to be relative to Mean Sea Level. Data is projected to UTM WGS84 zone 18. For comparing to other datums, here are excerpts from the NOAA Benchmark Data Sheets for nearby stations: Station ID: 8631044                                PUBLICATION DATE:  04/21/2003 Name:       WACHAPREAGUE, WACHAPREAGUE CHANNEL                             VIRGINIA NOAA Chart: 12210                                  Latitude:         37° 36.4' N USGS Quad:  WACHAPREAGUE                           Longitude:        75° 41.2' W                             T I D A L   D A T U M S Tidal datums at WACHAPREAGUE, WACHAPREAGUE CHANNEL based on:      LENGTH OF SERIES:      16 Years      TIME PERIOD:       January 1983 - December 1998      TIDAL EPOCH:           1983-2001      CONTROL TIDE STATION:  8638610 SEWELLS POINT, HAMPTON ROADS Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:      HIGHEST OBSERVED WATER LEVEL (02/05/1998)    =  2.720      MEAN HIGHER HIGH WATER (MHHW)                =  1.375      MEAN HIGH WATER (MHW)                        =  1.276      MEAN SEA LEVEL (MSL)                         =  0.696      MEAN TIDE LEVEL (MTL)                        =  0.664      MEAN LOW WATER (MLW)                         =  0.051      MEAN LOWER LOW WATER (MLLW)                  =  0.000    LOWEST  OBSERVED WATER LEVEL (03/16/1980)    = -0.860 Station ID: 8631542                                PUBLICATION DATE:  04/29/2003 Name:       SAND SHOAL INLET, COBB ISLAND                                  VIRGINIA NOAA Chart: 12224                                  Latitude:         37° 18.1' N USGS Quad:  COBB ISLAND                            Longitude:        75° 46.7' W                             T I D A L   D A T U M S Tidal datums at SAND SHOAL INLET, COBB ISLAND based on:      LENGTH OF SERIES:      36 MONTHS      TIME PERIOD:           October 1978 - September 1981      TIDAL EPOCH:           1983-2001      CONTROL TIDE STATION:  8638610 SEWELLS POINT, HAMPTON ROADS Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:      MEAN HIGHER HIGH WATER (MHHW)                =  1.369      MEAN HIGH WATER (MHW)                        =  1.268      MEAN TIDE LEVEL (MTL)                        =  0.658      MEAN SEA LEVEL (MSL)                         =  0.650      MEAN LOW WATER (MLW)                         =  0.049      MEAN LOWER LOW WATER (MLLW)                  =  0.000