Datasets / Corpus Christi Bay, TX (G310) Bathymetric Digital ElevationModel (30 meter resolution) Derived From Source Hydrographic SurveySoundings Collected by NOAA


Corpus Christi Bay, TX (G310) Bathymetric Digital ElevationModel (30 meter resolution) Derived From Source Hydrographic SurveySoundings Collected by NOAA

Published By National Oceanic and Atmospheric Administration, Department of Commerce

Issued over 9 years ago

US
beta

Summary

Type of release
ongoing release of a series of related datasets

Data Licence
Not Applicable

Content Licence
Creative Commons CCZero

Verification
automatically awarded

Description

Bathymetry for Corpus Christi Bay was derived from fifteen surveyscontaining 132,988 soundings. Four older, less accurate, overlappingsurveys were removed before tinning. The average separation betweensoundings was 66 meters. The fifteen surveys used dated from 1989 to1991. The range of soundings for the surveys was from 0.4 meters to-20.4 meters at mean low water. A mean high water value of 0.3 meterswas assigned to the shoreline. Nine points were found that were notconsistent with the surrounding points. These were removed prior totinning. DEM grid values outside the shoreline (on land) were assignednull values (-32676).Corpus Christi Bay has nine 7.5 minute DEMs and a single one degreeDEM. The 1 degree DEMs were generated from the higher resolution 7.5minute DEMs which covered the estuary. A Digital Elevation Model(DEM) contains a series of elevations ordered from south to northwith the order of the columns from west to east. The DEM isformatted as one ASCII header record (A- record), followed by aseries of profile records (B- records) each of which include a shortB-record header followed by a series of ASCII integer elevations(typically in units of 1 centimeter) per each profile. The lastphysical record of the DEM 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.