Parent Layer: Bathymetry

Name: Bathymetry Contours in Feet

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Description: Bathymetry was constructed from xyz hydrographic survey data from the northwest Gulf of Mexico Continental Shelf and inshore areas. The underlying source data are about 3.5 million soundings from 300 historic hydrographic surveys conducted in 1930-2005 by the U. S. Coast Survey, and available from the NOAA National Geophysical Data Center. Vector contours were derived from the source data sets using the GMT (Generic Mapping Tools) software package. Editing of source data reconciled: differences in zero datum; land subsidence with time; a diversity of survey methods and depth units; various other errors/ inaccuracies; and changes in nearshore bathymetry with time. The data were gridded, surfaced, smoothed, and re-gridded prior to contouring. Editing of contours was carried out in the Adobe Illustrator software package. The vector contours were imported from Adobe Illustrator into Arc-GIS, where GIS-compatible files containing the contours were created. As a final step, the contours were subjected to line smoothing. For more information on NOAA Coast Survey hydrographic data sets, refer to: http://www.ngdc.noaa.gov/mgg/bathymetry/hydro.html <a href='xml/TX_bathymetry_feet.xml' target='_blank'><b>Metadata</b><a></br>

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Spatial Reference: 102100  (3857)

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