San Francisco Bay Interferometric Side Scan Imagery: Area A

Backscatter imagery data were collected over shallow subtidal areas in the San Francisco Bay estuary system. 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. These mosaics were collected with the Edgetech 6205 sonar system in the San Francisco Bay. 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.

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 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. Secondarily, the survey shall provide OPC and NOAA with bathymetric survey data from a combination of multi-beam and interferometric sonars. 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 interferometric side-scan backscatter imagery 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 side scan sonar backscatter mosaic images 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 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. Likewise, the sonar was pole-mounted to the vessel, and equipment offsets were measured to an accuracy of approximately 1 centimeter (1 sigma level) using a Total Station. These factors created highly accurate horizontal positioning of the data that exceeded IHO Order 1A standards. Overlapping features in the imagery were examined to confirm accuracy standards were met.; Quantitative Value: 1.0 meters, Test that produced the value: Approximated maximum horizontal uncertainty in meters

N/A - no vertical accuracy can be attributed to the imagery product.

This data set was derived by mosaicking together lines in each survey block to generate a series of sonar side scan images throughout the survey area. No survey blocks contain missing data.

Overlapping data sets were analyzed for agreement. Imagery was visually inspected for artifacts and noise within each survey block.