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Data Set Contents: Descriptions of the seabed surface, primarily in U.S. coastal areas, derived from over 200,000 geologic samples collected during hydrographic surveys.

Historic data include survey id, sample number, latitude/longitude, original datum, and a brief description.

Newer data, from samples taken or coded after 2011, include the International Hydrographic Organization IHO S-57 descriptive attributes as described in the NOAA Office of the Coast Survey Specifications and Deliverables (see Appendix 10).



Seabed Descriptions from NOAA/NOS and USCGS Hydrographic Surveys



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Data Set Credits:
Under Hydrographic Technical Directive 2011-6 (HTD 2011-6), post-2011 bottom sample data are sent to NGDC in digital form by NOS.

Source "survey rep", "log sheet m", and "table" indicate data coded by Dan Neumann at NOS from historic reports.

Prior to August 2001, NOS sent hydrographic survey sediment samples and log sheets to the Smithsonian Institution National Museum of Natural History (NMNH) for archive. Source "NMNH" indicates data coded and contributed by NMNH.

Source "digitized" indicates observations from historic smooth sheets, digitized by NGDC with support from NOS.