Description

Bathymetry for Baffin Bay was derived from two surveys containing 14,924soundings. No surveys were omitted and no points were deleted. The averageseparation between soundings was 129 meters. Both surveys dated from 1968.The range of soundings was 0.2 meters to -4.9 meters at mean low water. Meanhigh water values between 0.1 and 0.3 meters were assigned to the shoreline.DEM grid values outside the shoreline (on land) were assigned null values (-32676).Baffin Bay has nine 7.5 minute DEMs and a single one degree DEM. The1 degree DEMs were generated from the higher resolution 7.5 minuteDEMs which covered the estuary. A Digital Elevation Model (DEM)contains a series of elevations ordered from south to north with theorder of the columns from west to east. The DEM is formatted as oneASCII header record (A- record), followed by a series of profilerecords (B- records) each of which include a short B-record headerfollowed by a series of ASCII integer elevations (typically in unitsof 1 centimeter) per each profile. The last physical record of theDEM is an 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.

General Information

• This data is described at

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