Assessing 155 Years of Hydrographic Survey Data for High Resolution Bathymetry Grids
Seafloor representation over vast areas requires the fusion of depth measurements from numerous data sets having variable spatial resolution and coverage. The most extensive coverage for U.S. coastal waters usually consists of data from hydrographic surveys conducted between 1850 and 2006. Intended for navigational charts, these survey projects have been planned, collected, and processed by the National Oceanic and Atmospheric Administration's National Ocean Service and its predecessor
... ions over the past 155 years. Integrating the extremely dense and localized data from modern multibeam echo sounders with the much more significant area coverage of older survey data presents the fundamental challenge when creating high resolution coastal bathymetry grids. Data from nearly 7000 hydrographic surveys are being assessed to produce bathymetry grids for the coastal U.S. Every survey in the database is associated with metadata attributes summarized from the survey's descriptive report. Compiling high quality coastal bathymetry over extensive regions involves several hundred surveys whose range in age often spans over a century. Compared to survey measurements and the original hydrographic processing shortly after field collection, the greater uncertainties in representing the seafloor come from errors in the archive data retrieval processing that occurred years after field collection, as well as from the unknown depths between sparse soundings of historic surveys, whose interpolated values will constitute a substantial portion of gridded bathymetric coverage for the entire U.S. coast. Alaska Hawaiian Islands MBES NOS SURVEYS END_YEAR Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.