- Selection output options include data display (< 1000 samples), KML (< 50,000 samples), and tab-delimited text (please download, rather than view large files).
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How to Cite:
National Ocean Service (2013): NOAA/NOS and USCGS Seabed Descriptions from Hydrographic Surveys. National Geophysical Data Center, NOAA, doi:10.7289/V5BG2KWG [date of data access]
About the Data
Brief descriptions of the surface of the seabed, primarily in U.S. coastal areas, derived from over 200,000 geologic samples collected during hydrographic surveys.
Source "survey rep", "log sheet m", and "table":
Data coded by Dan Neumann at NOS from historic reports. Fields included are survey id, sample number, latitude/longitude, original datum, and a brief description. Some records may also include derived IHO S-57 descriptive attributes.
Data coded and contributed by NMNH. 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. Fields included are survey id, sample number, latitude/longitude, original datum, and a brief description. NMNH staff added internal sample catalog numbers, project identifiers, and other descriptive information about the survey.
Observations from historic smooth sheets, digitized by NGDC with support from NOS. Caution: Sample locations and descriptions digitized from smooth sheets are approximate values interpreted by the digitizer, not original data..
NOS survey data digitized from smooth sheets by the National Marine Fisheries Service Alaska Fisheries Science Center (AFSC). Caution: Sample locations and descriptions digitized from smooth sheets are approximate values interpreted by the digitizer, not original data..
Other Sources (digital data from NOS):
Under Hydrographic Technical Directive 2011-6 (HTD 2011-6), data from samples taken after 2011 are sent to NGDC in digital form by NOS. These newer data include the International Hydrographic Organization IHO S-57 descriptive attributes as described in the NOAA Office of the Coast Survey NOS Hydrographic Survey, Specifications and Deliverables (2014 PDF).
NOS Hydrographic Survey Products
Seabed Sampling and Characteristics Data from other Sources