San Francisco Bay Interferometric Bathymetry: Area A

These interferometric bathymetric data were collected with the Edgetech 6205 sonar system in the San Francisco Bay. Bathymetric and acoustic backscatter data were collected simultaneously in 84 survey blocks. Seventy five of these blocks were surveyed with 100% cover of backscatter imagery and nine blocks were surveyed with 50% backscatter coverage. These data were collected as source material for planned benthic habitat mapping. An earlier project had been completed to map the very-shallow subtidal and intertidal areas using optical methods.

Original contact information:

Contact Name: Jen Eckerle

Contact Org: California Ocean Protection Council (OPC)

Title: Deputy Director, OPC

Phone: 916-653-9416

Email: jen.eckerle@resources.ca.gov

The primary purpose of this San Francisco Bay habitat mapping 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. Secondarily, the survey shall provide OPC and NOAA with bathymetric survey data from a combination of multi-beam and interferometric sonars. The interferometric bathymetry will not be as accurate as the bathymetry acquired with a multi-beam sonar. Thus, the areas with water depths greater than 20 meters, which shall be surveyed with a multi-beam system, are expected to have a higher order of accuracy. 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.

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Seventy-five survey blocks in Area A were acquired with the Edgetech 6205 sonar. The bathymetric products are organized by these blocks. The blocks represent the priority areas determined by the project partners and were arranged to avoid areas where data had already been collected. Data for each block was collected on the following dates. Block CA1B01 was acquired between 10/11/2014 and 10/12/2014. Block CA1B02 was acquired between 10/12/2014 and 12/5/2014. Block CA1B03 was acquired between 10/11/2014 and 10/11/2014. Block CA1B04 was acquired between 10/11/2014 and 12/5/2014. Block CA1B05 was acquired between 10/11/2014 and 12/6/2014. Block CA1B06 was acquired between 10/11/2014 and 12/21/2014. Block CA1B07 was acquired between 10/12/2014 and 12/6/2014. Block CA1B10 was acquired between 11/13/2014 and 11/13/2014. Block CA1B11 was acquired between 10/15/2014 and 12/5/2014. Block CA1B12 was acquired between 10/6/2014 and 11/13/2014. Block CA1B13 was acquired between 10/6/2014 and 12/6/2014. Block CA1B14 was acquired between 10/8/2014 and 12/7/2014. Block CA1B15 was acquired between 10/8/2014 and 12/14/2014. Block CA1B16 was acquired between 10/8/2014 and 12/15/2014. Block CA1B17 was acquired between 10/8/2014 and 12/7/2014. Block CA1B18 was acquired between 10/8/2014 and 12/7/2014. Block CA1B19 was acquired between 10/9/2014 and 10/9/2014. Block CA1B20 was acquired between 10/9/2014 and 12/7/2014. Block CA1B21 was acquired between 10/13/2014 and 12/5/2014. Block CA1B23 was acquired between 12/4/2014 and 12/4/2014. Block CA1B25 was acquired between 10/7/2014 and 12/14/2014. Block CA1B27 was acquired between 10/9/2014 and 12/14/2014. Block CA1B28 was acquired between 10/3/2014 and 12/6/2014. Block CA1B29 was acquired between 10/1/2014 and 12/5/2014. The survey data for Block CA1B30 was acquired between 10/6/2014 and 12/8/2014. Block CA1B31 was acquired between 10/4/2014 and 12/16/2014. Block CA1B32 was acquired between 10/7/2014 and 10/7/2014. Block CA1B33 was acquired between 10/15/2014 and 10/15/2014. Block CA1B34 was acquired between 10/7/2014 and 10/7/2014. Block CA2B01 was acquired between 10/16/2014 and 10/17/2014. Block NA1B01 was acquired between 11/2/2014 and 11/5/2014. Block NA1B02 was acquired between 11/1/2014 and 12/8/2014. Block NA1B03 was acquired between 12/9/2014 and 12/9/2014. Block NA1B04 was acquired between 10/26/2014 and 10/26/2014. Block NA1B05 was acquired between 10/18/2014 and 10/18/2014. Block NA1B06 was acquired between 10/17/2014 and 10/17/2014. Block NA1B07-08-09 was acquired between 10/11/2014 and 12/12/2014. Block NA1B10 was acquired between 10/18/2014 and 10/18/2014. Block NA1B11 was acquired between 10/10/2014 and 10/10/2014. Block NA1B12 was acquired between 12/12/2014 and 12/12/2014. Block NA1B13 was acquired between 11/2/2014 and 12/12/2014. NA1B14 was acquired between 10/19/2014 and 12/21/2014. Block NA1B16 was acquired between 12/10/2014 and 12/10/2014. Block NA1B17 was acquired between 12/10/2014 and 12/10/2014. Block NA1B18 was acquired between 10/16/2014 and 12/10/2014. Block NA1B19 was acquired between 10/8/2014 and 10/26/2014. Block NA1B20 was acquired between 10/8/2014 and 12/10/2014. Block NA1B21 was acquired between 11/10/2014 and 11/10/2014. Block NA1B22 was acquired between 11/5/2014 and 11/11/2014. Block NA1B24 was acquired between 10/31/2014 and 12/18/2014. Block NA1B25 was acquired between 10/28/2014 and 10/28/2014. Block NA1B26 was acquired between 10/28/2014 and 11/14/2014. Block NA1B27 was acquired between 10/5/2014 and 12/9/2014. Block NA2B01 was acquired between 10/31/2014 and 11/14/2014. Block NA2B02 was acquired between 11/5/2014 and 11/12/2014. Block NA2B03 was acquired between 11/5/2014 and 11/9/2014. Block NA2B04 was acquired between 10/29/2014 and 11/6/2014. Block NA2B05 was acquired between 10/18/2014 and 12/8/2014. Block SA1B01 was acquired between 11/15/2014 and 12/13/2014. Block SA1B02 was acquired between 11/18/2014 and 12/13/2014. Block SA1B03 was acquired between 11/20/2014 and 12/13/2014. Block SA1B04 was acquired between 10/15/2014 and 12/14/2014. Block SA1B05 was acquired between 10/21/2014 and 10/24/2014. Block SA1B06 was acquired between 10/20/2014 and 12/14/2014. Block SA1B07 was acquired between 11/24/2014 and 11/25/2014. Block SA1B08 was acquired between 11/21/2014 and 12/13/2014. Block SA1B09 was acquired between 11/25/2014 and 12/13/2014. Block SA1B10 was acquired between 11/25/2014 and 12/1/2014. Block SA1B11 was acquired between 11/29/2014 and 12/9/2014. Block SA1B12 was acquired between 11/28/2014 and 12/1/2014. Block SA2B01 was acquired between 11/18/2014 and 11/24/2014. Block SA2B02 was acquired between 10/24/2014 and 12/13/2014. Block SA2B03 was acquired between 11/24/2014 and 11/25/2014.

None

These bathymetry files depict the existing conditions of the seafloor at the time of the survey and are only accurate for that time. Use of these products is to be determined by the California Ocean Protection Council.

Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.1.1.3143

These data are not attributed.

Interferometric horizontal positioning met IHO Order 1A specifications, meaning the horizontal accuracy of the data had to be within 5 meters + 5% of depth. The actual horizontal accuracy of the bathymetry 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. Likewise, the vessel equipment offsets were measured to an accuracy of approximately 1 centimeter (1 sigma level) using a Total Station. Vessel roll and pitch were measured to an accuracy of approximately 0.02 degrees (1 sigma level) using an Applanix POS MV. These factors created highly accurate horizontal positioning of the data that exceeded IHO Order 1A standards. Overlapping features in the bathymetry were examined to confirm accuracy standards were met.; Quantitative Value: 1.0 meters, Test that produced the value: Approximated maximum horizontal uncertainty in meters

The Edgetech 6205 interferometric swath bathymetry were not expected to meet IHO Order 1a standards across the entire width of the survey swath. Instead, the QC crosslines were used to approximate the amount of swath that fell within IHO Order 1a standards. The crossline reports indicate that approximately the middle 50% of the swath achieved IHO Order 1a accuracy specifications. During acquisition, the interferometric lines were set to acquire data to 6 times water depth to each side of nadir, for a total of 12 times water depth. Thus, the crossline analysis indicates that approximately half, or a total of 3 times water depth to each side of nadir, achieved IHO Order 1a specifications. This analysis agrees with a manual review of the swath in the CARIS HIPS Subset Editor window.; Quantitative Value: 1.7 meters, Test that produced the value: Maximum Total Propagated Uncertainty in meters in outer beams

The data set was derived after manually rejecting erroneous soundings. The final bathymetric product was generated using a CUBE surface model of the cleaned bathymetry.

Overlapping data sets were analyzed for agreement. Crossline analysis was performed to ensure IHO Order 1a standards were met at the 95% confidence level. Total propagation of uncertainty values was calculated in CARIS HIPS software to ensure standards were met or exceeded.