April 2018 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:
April 2018 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 April 2018 just south of Dumbarton Bridge in south San Francisco Bay, California. A portion of the main channel was 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=2018-632-FA
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:
Single_Date/Time:
Calendar_Date: 20180413
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: -122.119591
East_Bounding_Coordinate: -122.111977
North_Bounding_Coordinate: 37.505166
South_Bounding_Coordinate: 37.498714
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:f9300c29-a8ac-4556-b287-98c9ab308878
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_Apr2018_bathy.png
Browse_Graphic_File_Description:
A shaded relief image of the April 2018 bathymetric survey with 10X vertical exaggeration to accentuate the 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. The RMS results from POS/MV surveys show vessel positional errors of less than 5 cm in the X and Y. 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:
The RMS results from POS/MV surveys show vertical positional errors of the survey vessel to be less than 5 cm. 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. GPS position data were passed through an Applanix Position and Motion Compensation System for Marine Vessels POS/MV 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: 2018
Process_Step:
Process_Description:
Vessel Position and Attitude. An Applanix Position and Motion Compensation System for Marine Vessels (POS/MV) was used to accurately determine the position of the survey vessel. The POS/MV utilizes Global Navigation Satellite System (GNSS) data in combination with angular rate and acceleration data from the IMU and heading data from the GPS Azimuth Measurement Systems (GAMS) to produce accurate position and orientation information through a virtual network of base stations. As opposed to receiving high-accuracy Real-Time Kinematic (RTK) corrections, the POS records raw inertial and GNSS data while surveying, which are later refined through post processing to incorporate publicly available GPS data from nearby base stations. During post processing the POS/MV data is run through POSPac software to produce a Smoothed Best Estimate of Trajectory (SBET) file, which is then imported back into Swath Processor to produce high-accuracy positions relative to the WGS84 ellipsoid. The RMS results from our POS/MV surveys show positional errors of less than 5 cm in X, Y, and Z.
Process_Date: 2018
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: 2018
Process_Step:
Process_Description:
Sonar Sounding Processing. GPS data and measurements of vessel motion (heave, pitch, and roll) were combined in the POS/MV hardware to produce a high-precision vessel attitude packet. This packet was transmitted to the Swath Processor acquisition software in post-processing 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 3.12.7). 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: 2018
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.
Process_Date: 2018
Process_Step:
Process_Description:
Datum Conversions. To convert the bathymetry from WGS84 ellipsoid heights to the tidal datum of MLLW the data were first transformed from WGS84(ITRF2000) to the NAD83(CORS96) ellipsoid using a 14-point Helmert transformation described by Soler and Snay (2004) using the command line tool CS2CS in the Proj4 library (http://trac.osgeo.org/proj/). A fixed Geoid09 offset of -32.58 m was then applied to convert the NAD83 ellipsoid heights to orthometric heights NAD83(CORS96)/NAVD88. The orthometric NAVD88 elevations were converted to MLLW (1983–2001 tidal epoch) by adding 0.37 m to the surface, the conversion provided by the CO-OPS division of NOAA for a 2005 bathymetric survey of south San Francisco Bay (Foxgrover and others, 2007).
Process_Date: 2021
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: grid cell
Row_Count: 709
Column_Count: 666
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: Attribute values
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: 0.2
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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