NOAA Hydrographic Survey Coverage

Overview This map service presents the location and coverage of National Ocean Service hydrographic surveys maintained by the National Oceanic and Atmospheric Administration National Centers for Environmental Information. It visualizes survey footprints and related availability information for coastal waters and the United States Exclusive Economic Zone. Layers Surveys with BAGs shows polygon coverage for surveys with Bathymetric Attributed Grids available. Surveys with Digital Sounding Data shows polygon coverage for surveys with digital sounding data available for download, including surveys with Bathymetric Attributed Grids. Surveys without Digital Sounding Data shows polygon coverage for surveys without digital sounding data available for download. Characteristics The service represents hydrographic survey areas as polygon features and supports mapping, querying, and data access. The symbology includes a unique-value style by decade for the digital sounding data layer and simple polygon rendering for the other survey layers. Survey records surface attributes such as survey identifier, survey dates, locality, platform, product information, and download links. Temporal summary The survey collection is historical and spans work completed from 1837 through 1965, with digitally acquired survey data continuing since 1965. The dates support review of survey acquisition, modification, approval, and addition over time. Geographic Coverage The service covers the coastal waters and Exclusive Economic Zone of the United States and its territories, with global web map extent and Web Mercator spatial reference. Use Cases This service supports discovery and visualization of hydrographic survey coverage, review of survey availability, and access to NOAA survey metadata and related downloads for coastal mapping and marine data workflows.