Short Citation:
Office for Coastal Management, 2021: San Francisco Bay Interferometric Bathymetry: Area B, https://www.fisheries.noaa.gov/inport/item/47864.

Item Identification

Title: San Francisco Bay Interferometric Bathymetry: Area B
Short Name: ca_sfb15_sss_bath-B-meta
Status: Completed
Publication Date: 2016
Abstract:

High resolution sonar data were collected over ultra-shallow areas of the San Francisco Bay estuary system. Bathymetric and acoustic backscatter data were collected simultaneously in 10 survey blocks. All of these blocks were surveyed with 100% cover of backscatter imagery. 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. Interferometric sidescan bathymetry data were acquired using a 468 kHz Bathyswath sonar system aboard the RV MacGinitie and RV Kelpfly. Both of these platforms were well suited to acquire data in the very shallow subtidal areas of the bay.

Original contact information:

Contact Name: Jen Eckerle

Contact Org: Ocean Protection Council (OPC)

Title: Deputy Director, Ocean Protection Council

Phone: 916-653-9416

Email: jen.eckerle@resources.ca.gov

Purpose:

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), high-resolution accurately positioned sonar imagery data of San Francisco Bay coastal and near shore waters to delineate marine habitat types. Survey data from a combination of multi-beam and interferometric sonars, 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:

10022

Supplemental Information:

Ten survey blocks in Area B were acquired with the Bathyswath sonar and 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. Prior to data collection, a series of planned survey lines were created using the survey navigation and planning software HYPACK (Hypack, Inc). An Applanix Position and Orientation System, Marine Vessel (POS MV 320 v4) system was used on the RV MacGinitie and a Wavemaster on the RV Kelpfly to provide position and attitude data during data collection and accounted for vessel motion such as heave, pitch, and roll (position accuracy 2m, pitch, roll and heading accuracy +/-0.02 degrees, heave accuracy +/-5% or 5cm). KGPS altitude data were used to account for tide cycle fluctuations and sound velocity profiles were collected with YSI Castaway CTDs. Data acquisition, post-processing, and final products derived from bathymetry data were handled by the Seafloor Mapping Lab at CSUMB and submitted to Fugro Pelagos for inclusion in the San Francisco Bay Habitat Mapping project. Delivered formats included CARIS base surface, BAG, ESRI Grid, and color relief Geotiffs, for each block.

Bathymetric surveys for Block NBB01 were conducted on 11/18-19, 22, 2015; Block NBB02 on 6/6, 11/13-17, 19, 22-23, 12/10, 2015; Block NBB03 on 11/23-14, 12/7-11, 2015; Block NBB04 on 12/7, 10, 2015; Block NBB05 on 6/4-5, 11/28-29, 12/8, 11, 2015; Block CBB01/Islais Creek Channel on 5/2/2015; Block CBB02/India Basin on 5/2/2015; Block CBB03/South Basin on 5/2/2015; Block SBB01 on 3/16-18, 4/16-18, 4/30-5/1, 7/9, 8/3-4, 8/31-9/2, 2015; Block SBB02 on 4/16, 7/6-11, 9/3-5, 12/12. KF-includes RV Kelpfly surveys.

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 elevation
ISO 19115 Topic Category geoscientificInformation
ISO 19115 Topic Category imageryBaseMapsEarthCover
ISO 19115 Topic Category oceans
None Bathymetry
None California Ocean Protection Council
None California Seafloor Mapping Program (CSMP)
None Interferometric Sonar

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 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: Seafloor Mapping Lab (SFML) at California State University Monterey Bay

Support Roles

Data Steward

CC ID: 610165
Date Effective From: 2016
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: 610167
Date Effective From: 2016
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: 610168
Date Effective From: 2016
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: 610166
Date Effective From: 2016
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: 610171
W° Bound: -122.5032
E° Bound: -122.0462
N° Bound: 38.13586
S° Bound: 37.455

Extent Group 1 / Time Frame 1

CC ID: 610170
Time Frame Type: Range
Start: 2015-03-16
End: 2015-12-12

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Access Information

Security Class: Unclassified
Data Access Constraints:

None

Data Use Constraints:

To be determined by the California Ocean Protection Council (OPC) and its contracting research partners. These data depict the existing condition of the seafloor at the time of survey and should be considered only accurate for that time. Acknowledgment of the California Ocean Protection Council (OPC) would be appreciated in any publications or derived products.

Activity Log

Activity Log 1

CC ID: 610192
Activity Date/Time: 2017-02-13
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 610191
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: 717634
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 750269
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:

These data are not attributed.

Horizontal Positional Accuracy:

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 laser levels and meter tapes. 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. Features in overlapping lines in the bathymetry were examined to confirm accuracy standards were met.

Vertical Positional Accuracy:

The Bathyswath 468 kHz interferometric swath bathymetry were not expected to meet IHO Order 1a standards across the entire width of the survey swath. Despite this, crossline analysis in CARIS HIPS indicated that 99.9% of cleaned crossline soundings achieved IHO Order 1a accuracy specifications, while 98.7% exceeded Order 1a and achieved Special Order specification. During acquisition, the interferometric system was set to acquire data at up to 60 m range. The majority of cleaned (accepted) soundings were within 40-45 m of nadir, but some soundings were retained out to the full 60 m range. The proportion of soundings satisfying Special Order accuracy specifications decreased at ranges greater than 40 m from nadir, but the relative scarcity of these outer-swath soundings mitigated their impact on the overall assessment. This analysis agrees with a manual review of the swath in the CARIS HIPS Subset Editor window.

Completeness Report:

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.

Conceptual Consistency:

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 were calculated in CARIS HIPS software to ensure standards were met or exceeded

Lineage

Process Steps

Process Step 1

CC ID: 610159
Description:

Interferometric side-scan bathymetric data collection. Prior to data collection, a series of planned survey lines were created using the survey navigation and planning software HYPACK (Hypack, Inc). An Applanix Position and Orientation System, Marine Vessel (POS MV 320 v4) system was used on the RV MacGinitie and a Wavemaster on the RV Kelpfly to provide position and attitude data during data collection and accounted for vessel motion such as heave, pitch, and roll (position accuracy 2m, pitch, roll and heading accuracy +/-0.02 degrees, heave accuracy +/-5% or 5cm). KGPS altitude data were used to account for tide cycle fluctuations and sound velocity profiles were collected with YSI Castaway CTDs. Data acquisition, post-processing, and final products derived from bathymetry data were handled by the Seafloor Mapping Lab at CSUMB and submitted to Fugro Pelagos for inclusion in the San Francisco Bay Habitat Mapping project. Delivered formats included CARIS base surface, BAG, ESRI Grid, and color relief Geotiffs, for each block.

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

Process Step 2

CC ID: 610160
Description:

Bathymetric data processing. Bathymetry data were acquired in SXR files using an Bathyswath 468 kHz sonar. The bathymetry was processed in Bathyswath Swath Processor software to correct for post-processed navigation/positioning, tides, sound velocity, calibration values, and noise. After processing in Swath Processor, the processed lines were converted to HDCS format using CARIS HIPS and SIPS (v8.18 and v8.19). CARIS CUBE surfaces in the CSAR file format were generated at a 1-meter bin size for each survey block and further cleaned of noise. These CSAR surfaces were exported at 1m and 2m resolution to BAG format, ESRI Grid format, and color-coded geo-tiff formats. 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: 2016-04-15 00:00:00

Catalog Details

Catalog Item ID: 47864
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