Short Citation:
Office for Coastal Management, 2021: San Francisco Bay Multi-beam Backscatter Imagery: Area A, https://www.fisheries.noaa.gov/inport/item/47861.

Item Identification

Title: San Francisco Bay Multi-beam Backscatter Imagery: Area A
Short Name: ca_sfb14_mbs_imagery-A-meta
Status: Completed
Abstract:

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. These mosaics were collected with the Reson Seabat 7101 multibeam sonar system in the San Francisco Bay. For this San Francisco Bay habitat mapping project, seven survey blocks were acquired with the Reson 7101 sonar, as these seven areas contained water depths that were predominantly deeper than 20 meters.

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

Purpose:

The primary purpose of this acoustic backscatter 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.

Notes:

10019

Supplemental Information:

Seven survey blocks in Area A were acquired with a Reson 7101 multibeam sonar. The multi-beam 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 CA1B08 was acquired between 12/21/2014 and 12/21/2014. Block CA1B09 was acquired between 12/21/2014 and 12/21/2014. Block CA1B22 was acquired between 12/13/2014 and 12/16/2014. Block CA1B24 was acquired between 12/10/2014 and 12/13/2014. Block CA1B26 was acquired between 12/14/2014 and 12/15/2014. Block NA1B15 was acquired between 12/16/2014 and 12/21/2014. Block NA1B23 was acquired between 12/18/2014 and 12/18/2014.

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Benthic
Global Change Master Directory (GCMD) Science Keywords Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Coastal
Global Change Master Directory (GCMD) Science Keywords Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Estuary
ISO 19115 Topic Category geoscientificInformation
ISO 19115 Topic Category imageryBaseMapsEarthCover
ISO 19115 Topic Category oceans
None California Ocean Protection Council
None California Seafloor Mapping Program (CSMP)
None multibeam backscatter imagery
None Reson Seabat 7101

Spatial Keywords

Thesaurus Keyword
Geographic Names Information System California
Geographic Names Information System Contra Costa County
Geographic Names Information System Marin County
Geographic Names Information System San Francisco Bay
Geographic Names Information System San Francisco County
Geographic Names Information System San Mateo County
Geographic Names Information System Solano County
Geographic Names Information System United States
Global Change Master Directory (GCMD) Location Keywords Continent > North America > United States Of America > California

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Data Presentation Form: Map (digital)
Data Set Credit: California Ocean Protection Council (OPC) and Fugro Pelagos, Inc.

Support Roles

Data Steward

CC ID: 610055
Date Effective From: 2017-02-13
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Distributor

CC ID: 610057
Date Effective From: 2017-02-13
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Metadata Contact

CC ID: 610058
Date Effective From: 2017-02-13
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Point of Contact

CC ID: 610056
Date Effective From: 2017-02-13
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 610061
W° Bound: -122.457918
E° Bound: -122.22641
N° Bound: 38.066568
S° Bound: 37.707297

Extent Group 1 / Time Frame 1

CC ID: 610060
Time Frame Type: Range
Start: 2014-12-10
End: 2014-12-21

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Access Information

Security Class: Unclassified
Data Access Constraints:

None

Data Use Constraints:

These multi-beam 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.

Activity Log

Activity Log 1

CC ID: 610082
Activity Date/Time: 2017-02-13
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 610081
Activity Date/Time: 2017-11-14
Description:

Converted from FGDC Content Standard for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 717631
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 750266
Activity Date/Time: 2018-04-11
Description:

Partial upload to move data access FTP links to Distribution Info and remove broken URLs.

Technical Environment

Description:

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

Data Quality

Accuracy:

The attributes of these data include positioning and backscatter intensity values.

Horizontal Positional Accuracy:

Multi-beam data met IHO Order 1A specifications, meaning the horizontal accuracy of multibeam data had to be within 5 meters + 5% of depth. The actual horizontal accuracy of the backscatter imagery 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 multibeam backscatter data that exceeded IHO Order 1A standards. Overlapping features in the backscatter data were examined visually to confirm accuracy standards were met.; Quantitative Value: 0.6 meters, Test that produced the value: Maximum Total Propagated Uncertainty in meters

Vertical Positional Accuracy:

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

Completeness Report:

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

Conceptual Consistency:

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

Lineage

Process Steps

Process Step 1

CC ID: 610048
Description:

Multi-beam backscatter data acquisition. These backscatter data were acquired in S7K files using a Reson Seabat 7101.

Process Step 2

CC ID: 610049
Description:

Multi-beam backscatter processing. The bathymetry was processed in CARIS HIPS software to generate a Generic Sensor Format (GSF) file for each survey line. The GSF and S7K files were paired together in GeoCoder software to process the backscatter for each survey block. During processing in GeoCoder, the each group of survey lines was corrected for acquisition parameters, such as power, gain, and range settings. The resulting normalized backscatter was mosaicked at 0.5 meter resolution and output to geo-tiff format in greyscale color.

Process Date/Time: 2014-12-01 00:00:00

Process Step 3

CC ID: 610050
Description:

Backscatter data processing. The bathymetry was processed in CARIS HIPS software to generate a Generic Sensor Format (GSF) file for each survey line. The GSF and S7K files were paired together in GeoCoder software to process the backscatter for each survey block. During processing in GeoCoder, the backscatter values were normalized across factors such as power, gain, and range settings. This area-based processing allowed for export of a geo-tiff mosaic at 0.5 meter resolution. More detailed information on data processing can be found in the project Data Acquisition and Processing Report NCNP0000-14-01192_DAPR.pdf

Process Date/Time: 2015-03-31 00:00:00

Catalog Details

Catalog Item ID: 47861
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-14 12:57+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2019-07-02 15:17+0000
Metadata Record Published: 2018-04-11
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2019-04-12