December 2008 bathymetry collected near Dumbarton Bridge in south San Francisco Bay, California

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Amy C. Foxgrover
Originator: Bruce E. Jaffe
Originator: Theresa A. Fregoso
Publication_Date: 20220701
Title:
December 2008 bathymetry collected near Dumbarton Bridge in south San Francisco Bay, California
Geospatial_Data_Presentation_Form: raster digital data set
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9BIB67S
Publication_Information:
Publication_Place:
Pacific Coastal and Marine Science Center, Santa Cruz, California
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/P9BIB67S
Larger_Work_Citation:
Citation_Information:
Originator: Amy C. Foxgrover
Originator: Bruce E. Jaffe
Originator: Theresa A. Fregoso
Publication_Date: 2022
Title:
Bathymetric surveys collected near Dumbarton Bridge in south San Francisco Bay, California, 2008 to 2019
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9BIB67S
Publication_Information:
Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/P9BIB67S
Description:
Abstract:
Bathymetric survey data were collected in December 2008 just south of Dumbarton Bridge in south San Francisco Bay, California. Portions of the main channel and western shallows/intertidal mudflats were surveyed using an interferometric sidescan sonar system following procedures detailed in Foxgrover and others, 2011. The bathymetry is provided as a 1-m resolution raster in geoTIFF format, referenced to the vertical datum of mean lower low water (MLLW). To convert to the North American Vertical Datum of 1988 (NAVD88), subtract a static offset of 0.37 m (datum conversions provided in Foxgrover and others, 2007).
Purpose:
In 2008 the USGS began mapping the main channel and shallow intertidal mudflats between the Dumbarton Bridge and a railroad bridge located 1 km to the south in south San Francisco Bay. This information was collected to document bathymetric change before and after restoration to inform the South Bay Salt Pond Restoration Project (https://www.southbayrestoration.org), which initiated the restoration of a former salt pond (SF2) on the western shore in 2010. In 2011, following the collection of eight bathymetric surveys, funding for this site-specific project came to an end, yet the location remained an instrumentation calibration site for ongoing research in Alviso Slough (Foxgrover and others, 2011). The calibration surveys collected near the Dumbarton Bridge resulted in an additional eight surveys, collected primarily in the main channel, from 2013 to 2019.
Supplemental_Information:
Additional information about the field activity from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=S1608SF
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20081208
Ending_Date: 20081210
Currentness_Reference: ground condition at time data were collected
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -122.126138
East_Bounding_Coordinate: -122.111890
North_Bounding_Coordinate: 37.506548
South_Bounding_Coordinate: 37.497008
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ddca5702-befd-466f-97c3-ada0bbef4b1a
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
Theme_Keyword: inlandWaters
Theme:
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: Bathymetry and Elevation
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: bathymetry
Theme_Keyword: bathymetry measurement
Theme_Keyword: digital elevation models
Theme_Keyword: interferometric sonar
Theme_Keyword: sidescan sonar
Theme_Keyword: GPS measurement
Theme:
Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: geographic information systems (GIS)
Theme_Keyword: wetland restoration
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Hazards and Resources Program
Theme_Keyword: CMHRP
Theme_Keyword: Pacific Coastal and Marine Science Center
Theme_Keyword: PCMSC
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: State of California
Place_Keyword: San Francisco Bay
Place_Keyword: Alameda County
Place_Keyword: San Mateo County
Place_Keyword: Dumbarton Bridge
Access_Constraints: None
Use_Constraints:
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigation purposes.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Person: PCMSC Science Data Coordinator
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: DB_Dec2008_bathy.png
Browse_Graphic_File_Description:
A shaded relief image of the December 2008 bathymetric survey with 10X vertical exaggeration to accentuate the tidal flat and channel morphology.
Browse_Graphic_File_Type: PNG
Data_Set_Credit:
Funding was provided by the U.S. Geological Survey, California Coastal Conservancy, U.S. Environmental Protection Agency, the Resources Legacy Fund, and Santa Clara Valley Water District.
Native_Data_Set_Environment:
SEA Swath Processor (ver. 3.12.7), Caris HIPS and SIPS (ver. 9.1) and ArcMap (ver. 10.7.1) on a Windows 10 computer.
Cross_Reference:
Citation_Information:
Originator: Amy C. Foxgrover
Originator: David P. Finlayson
Originator: Bruce E. Jaffe
Originator: Theresa A. Fregoso
Publication_Date: 2011
Title:
Bathymetry and digital elevation models of Coyote Creek and Alviso Slough, south San Francisco Bay, California (Version 5.0, June 2020)
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2011-1315
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.3133/ofr20111315
Cross_Reference:
Citation_Information:
Originator: Amy C. Foxgrover
Originator: Bruce E. Jaffe
Originator: Gerald T. Hovis
Originator: Craig A. Martin
Originator: James R. Hubbard
Originator: Manoj R. Samant
Originator: Steve M. Sullivan
Publication_Date: 2007
Title: 2005 Hydrographic Survey of South San Francisco Bay, California
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2007-1169
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.3133/ofr20071169
Cross_Reference:
Citation_Information:
Originator: Applied Microsystems Ltd.
Publication_Date: 2005
Title:
SVplus sound velocity, temperature, and depth profiler user's manual
Other_Citation_Details:
Applied Microsystems Ltd., 2005, SVplus sound velocity, temperature, and depth profiler user's manual, ver. 1.23, https://amloceanographic.com/.
Cross_Reference:
Citation_Information:
Originator: T. Soler
Originator: R.A. Snay
Publication_Date: 2004
Title:
Transforming positions and velocities between the International Terrestrial Reference Frame of 2000 and North American Datum of 1983
Other_Citation_Details:
Soler, T., and Snay, R.A., 2004, Transforming positions and velocities between the International Terrestrial Reference Frame of 2000 and North American Datum of 1983: Journal of Surveying Engineering, v. 130, no. 2, https://doi.org/10.1061/(ASCE)0733-9453(2004)130:2(49)
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
These bathymetric data have not been independently verified for accuracy.
Logical_Consistency_Report:
All bathymetric values are derived from the same instruments and processing workflow. No formal logical accuracy tests were conducted.
Completeness_Report:
Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Uncertainty in the horizontal position of each sounding is a function of the total uncertainty propagated through each of the following component instruments: 1) base station GPS, 2) vessel GPS, 3) inertial motion unit (IMU), 4) water sound velocity model, and 5) beam spreading in the water column. Assuming no systematic errors in the measurement instruments themselves, beam spreading is the dominate source of positional uncertainty. The 1-degree sonar beam of the SWATHplus-M results in horizontal uncertainty ranging from 0.10 m at 10 m slant range, to about 0.45 m at 50 m slant range.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
For relatively flat regions, the standard deviation of sounding elevations within each 1 m by 1 m cell is a good representation of survey precision. After filtering the data to remove obvious outliers, the standard deviation of the remaining sounding elevations was calculated for each cell (each containing tens of soundings) in CARIS. The mean standard deviation on the intertidal flats is 4 cm and below MLLW where actual variability in slope influences the values, the average standard deviation is 10 cm. When possible, an additional assessment of survey accuracy was conducted by analyzing sounding values at the intersection of perpendicular trackline crossings. The mean difference of trackline crossing on the intertidal flats 2 cm (SD = 4) matched that of the channel and channel margin (depths below MLLW) but with increased spread in the data, 2 cm (SD = 10).
Lineage:
Process_Step:
Process_Description:
Sonar Data Collection. Bathymetry data were collected using a 234.5 kHz SEA (Systems Engineering and Assessment Ltd.) SWATHplus-M phase-differencing sidescan sonar. The sonar was pole-mounted on the 34-foot USGS mapping vessel R/V Parke Snavely and affixed to a hull brace. Real-time kinematic (RTK) GPS position data were passed through a CodaOctopus F180 inertial measurement unit (IMU) to the sonar hardware and data collection software. Sonar heads, GPS antennae, and the IMU were surveyed in place to a common reference frame with a Geodimeter 640 Total Station. The R/V Parke Snavely was outfitted with three networked workstations and a navigation computer for use by the captain and survey crew for data collection and initial processing.
Process_Date: 2008
Process_Step:
Process_Description:
Geodetic Control. Geodetic control for the survey was established using a shore based Global Positioning System (GPS) base station broadcasting Real Time Kinematic (RTK) corrections to the survey vessel via UHF radio link. The base station was located near the historic Dumbarton fishing pier, on a benchmark identified as RAV3. Reference Frame: NAD83 (NSRS2007) Epoch Date: 2007.00, Latitude: N 37 degrees 29' 55.62946", Longitude: W 122 degrees 07' 42.47332", Orthometric Height: 2.438 m (NAVD88 height modernization project elevation)
Process_Date: 2008
Process_Step:
Process_Description:
Vessel Position and Attitude. The R/V Parke Snavely was equipped with a CodaOctopus F180 attitude and positioning system for the duration of the survey. The F180 was running F190 firmware and received real-time kinematic (RTK) corrections directly. The RTK GPS data (2 cm error ellipse) were combined with the inertial motion measurements directly within the F190 hardware so that high-precision position and attitude corrections are fed in real-time to the sonar acquisition equipment. The NAD83 (NSRS2007) Epoch 20007.00 3-dimensional reference frame was used for all data acquisition.
Process_Date: 2008
Process_Step:
Process_Description:
Sound Velocity Measurements. Sound velocity measurements were collected continuously with an Applied Micro Systems Micro SV deployed on the transducer frame for real-time sound velocity adjustments at the transducer-water interface. The Micro SV is accurate to +/- 0.03 m/s. In addition, sound velocity profiles (SVP) were collected with an Applied MicroSystems, SvPlus 3472. This instrument provides time-of-flight sound-velocity measurements by using invar rods with a sound-velocity accuracy of +/- 0.06 m/s, pressure measured by a semiconductor bridge strain gauge to an accuracy of 0.15 percent (Full scale) and temperature measured by thermistor to an accuracy of 0.05 degrees Celsius (Applied Microsystems Ltd., 2005).
Process_Date: 2008
Process_Step:
Process_Description:
Sonar Sounding Processing. GPS data and measurements of vessel motion were combined in the F180 hardware to produce a high-precision vessel attitude packet. This packet was transmitted to the Swath Processor acquisition software in real-time and combined with instantaneous sound velocity measurements at the transducer head before each ping. Up to 20 pings per second were transmitted with each ping consisting of 2048 samples per side (port and starboard). The returned samples were projected to the seafloor using a ray-tracing algorithm working with the previously measured sound velocity profiles in SEA Swath Processor (version 3.05.18.04). A series of statistical filters were applied to the raw samples to isolate the seafloor returns from other uninteresting targets in the water column. Finally, the processed data were stored line-by-line in both raw (.sxr) and processed (.sxp) trackline files.
Process_Date: 2009
Process_Step:
Process_Description:
Digital Elevation Model Production. The raw bathymetry data were filtered in SEA Swath Processor (version 3.12.7) and imported into CARIS HIPS and SIPS (version 9.1) for post-processing. Within CARIS a swath angle BASE (Bathymetric with Associated Statistical Error) surface was created at 1-m resolution and the subset editor used to manually eliminate any remaining outliers or artifacts. The average depth within each 1 by 1 m cell was exported as an ASCII text file and imported into Surfer (version 10) for interpolation using a linear kriging algorithm with a 1-simga nugget of 0.07 m and a 5 by 5 m search radius. The resultant grid was exported to ESRI ArcMap (version 10.7.1) for display and further analyses. The surveys collected from December 2008 through January 2011 using the F180 IMU were deepened by 13 cm to account for the measured F180/POS MV bias (detailed in Foxgrover and others, 2011).
Process_Date: 2009
Process_Step:
Process_Description:
Datum Conversions. To convert the bathymetry from the geodetic vertical datum of NAVD88 to the tidal datum of MLLW (1983–2001 tidal epoch), 0.37 m was added, as specified in datum conversions provided by the CO-OPS division of NOAA for a 2005 bathymetric survey of south San Francisco Bay (Foxgrover and others, 2007).
Process_Date: 20210601
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: grid cell
Row_Count: 1046
Column_Count: 1249
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 10
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -123
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 1.0
Ordinate_Resolution: 1.0
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983 (NSRS2007)
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: Mean Lower Low Water (MLLW)
Altitude_Resolution: 0.01
Altitude_Distance_Units: meters
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Altitude
Entity_Type_Definition: Elevation relative to MLLW in meters. Values are positive up.
Entity_Type_Definition_Source: Producer defined
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey - CMGDS
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 1-831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
Resource_Description:
These data are available in GeoTIFF format, including a tif world file (.tfw) and CSDGM FGDC-compliant metadata.
Distribution_Liability:
Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: GeoTIFF
Format_Version_Number: ArcGIS 10.7.1
Format_Information_Content:
Downloadable zip file contains the TIFF (.tif), and the tif world file (.tfw).
File_Decompression_Technique: WinZip
Transfer_Size: 1.7
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://doi.org/10.5066/P9BIB67S
Access_Instructions:
Data can be downloaded using the Network_Resource_Name links and scrolling down to the survey data of interest.
Fees: None.
Technical_Prerequisites:
The downloadable data file has been compressed with the "zip" command and can be unzipped with Winzip (or other tool) on Windows systems. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing a GeoTIFF file.
Metadata_Reference_Information:
Metadata_Date: 20220701
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Person: PCMSC Science Data Coordinator
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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