The actual horizontal accuracy of the data exceeded these requirements, as the navigation/position data for the vessel was post-processed using an Applanix SmartBase post-processed kinematic solution, resulting in vessel horizontal positioning RMS values under 5 centimeters. Interferometric horizontal positioning met IHO Order 1A specifications, meaning the horizontal accuracy of the data had to be within 5 meters + 5% of depth. Block NA1B07-08-09 was acquired between and. The survey data for Block CA1B30 was acquired between and. Data for each block was collected on the following dates. The blocks represent the priority areas determined by the project partners and were arranged to avoid areas where data had already been collected. The interferometric side-scan backscatter imagery products are organized by these blocks. Seventy-five survey blocks in Area A were acquired with the Edgetech 6205 sonar. The combined survey data, including the imagery and the bathymetry, will support OPC's goals as well as assist with NOAA's mandate for port and harbor maintenance (dredging), coastal engineering (beach erosion and replenishment studies), and coastal zone management. Secondarily, the survey shall provide OPC and NOAA with bathymetric survey data from a combination of multi-beam and interferometric sonars. For this San Francisco Bay habitat mapping project, seventy-five survey blocks were acquired with the Edgetech 6205 sonar, as these seventy-five areas contained water depths that were predominantly shallower than 20 meters and thus more efficiently mapped using side-scan sonar methods.Ĭontact Org: California Ocean Protection Council (OPC)Įmail: primary purpose of this San Francisco Bay acoustic data acquisition is to provide the California Ocean Protection Council (OPC), as required for the California Seafloor Mapping Program (CSMP) modern, accurately positioned sonar imagery data of San Francisco Bay coastal and near shore waters to delineate marine habitat types. These mosaics were collected with the Edgetech 6205 sonar system in the San Francisco Bay. An earlier project had been completed to map the very-shallow subtidal and intertidal areas using optical methods. These data were collected as source material for planned benthic habitat mapping. Seventy five of these blocks were surveyed with 100% cover of backscatter imagery and nine blocks were surveyed with 50% backscatter coverage. Bathymetric and acoustic backscatter data were collected simultaneously in 84 survey blocks. San Francisco Bay Interferometric Side Scan Imagery: Area Aīackscatter imagery data were collected over shallow subtidal areas in the San Francisco Bay estuary system.
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