Metadata: Identification_Information: Citation: Citation_Information: Originator: Peter Dartnell Originator: Andrew W. Stevens Originator: Jessica R. Lacy Publication_Date: 20250820 Title: Acoustic-backscatter data from repeat side-scan sonar surveys of south San Francisco Bay, California, 2023-2025 Geospatial_Data_Presentation_Form: GeoTIFF Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P14D723N 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/P14D723N Larger_Work_Citation: Citation_Information: Originator: Samantha C. McGill Originator: Jessica R. Lacy Originator: Andrew W. Stevens Originator: Rachel M. Allen Originator: Peter Dartnell Originator: Joanne C. Thede Originator: Angela C. Tan Originator: Gerald A. Hatcher Publication_Date: 2025 Title: Hydrodynamic, bathymetric, and sediment transport data spanning dredge material placement in south San Francisco Bay, California, 2023-2025 Series_Information: Series_Name: data release Issue_Identification: doi:10.5066/P14D723N Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, California Publisher: U.S. Geological Survey Other_Citation_Details: Suggested Citation: McGill, S.C., Lacy, J.R., Stevens, A.W., Allen, R.M., Dartnell, P., Thede, J.C., Tan, A.C., and Hatcher, G.A., 2025, Hydrodynamic, bathymetric, and sediment transport data spanning dredge material placement in south San Francisco Bay, California, 2023-2025: U.S. Geological Survey data release, https://doi.org/10.5066/P14D723N. Online_Linkage: https://doi.org/10.5066/P14D723N Description: Abstract: Acoustic-backscatter data were collected with a 234 kHz SwathPlus interferometric side-scan sonar during repeat bathymetric surveys of south San Francisco Bay, California between 2023 and 2025. Data were collected and processed by the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC) with fieldwork activity number 2023-655-FA. Data are provided as a GeoTIFF images. Purpose: Repeat bathymetric and acoustic backscatter data were collected between October 2023 and January 2025 to quantify the initial deposition and dispersal of fine-grained (less than 63 micron) sediment deposits formed when 73,000 cubic meters of sediment dredged from the Redwood City navigation channel was placed in the shallows of south San Francisco Bay, California. The swath sonar system consisted of a 234 kHz SwathPlus interferometric side scan sonar and POS-MV WaveMaster-II positioning system. The surveys were conducted on October 25-26, 2023, January 8-9, 2024, January 23-25, 2024, March 6-8, 2024, October 15-16, 2024, January 14-15, 2025. 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=2023-655-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: Range_of_Dates/Times: Beginning_Date: 20231025 Ending_Date: 20250115 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: -122.182946 East_Bounding_Coordinate: -122.168298 North_Bounding_Coordinate: 37.607479 South_Bounding_Coordinate: 37.577268 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:701d3957-86f5-492b-96c9-bc58bbccbc33 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme_Keyword: elevation Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: sea-floor acoustic reflectivity Theme_Keyword: geospatial datasets Theme_Keyword: marine geophysics Theme_Keyword: sonar methods Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: Substrate Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Keywords Theme_Keyword: field observation 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: San Francisco Bay Place_Keyword: State of California Place: Place_Keyword_Thesaurus: none Place_Keyword: South San Francisco Bay Place_Keyword: Eden Landing Ecological Reserve Access_Constraints: No access constraints 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 originators 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: DMP23_backscatter_intensity.png Browse_Graphic_File_Description: Maps showing acoustic backscatter for each SwathPlus survey. Browse_Graphic_File_Type: PNG Native_Data_Set_Environment: Matlab version 2024a on a Windows 11 computer. Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: No formal attribute accuracy tests were conducted. Logical_Consistency_Report: 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: The Applanix POS-MV post-processed horizontal positional accuracy is about 0.1 m with roll and pitch accuracies of about 0.02 degrees (https://www.applanix.com/downloads/products/specs/posmv/POS-MV-WaveMaster-II.pdf). Accuracies of final products may be lower due to total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Not applicable to acoustic-backscatter data. Lineage: Process_Step: Process_Description: Surveys were conducted on October 25-26, 2023, January 8-9, 2024, January 23-25, 2024, March 6-8, 2024, October 15-16, 2024, January 14-15, 2025. All six surveys were conducted using the same mapping systems and post-processed using the same methodology. The data were collected with a SWATHplus-M 234-kHz interferometric side-scan sonar system pole-mounted on the U.S. Geological Survey (USGS) R/V Parke Snavely. During the mapping mission, an Applanix POS-MV (Position and Orientation System for Marine Vessels) was used to position the vessel during data collection, and it also accounted for vessel motion such as heave, pitch, and roll. The POS-MV also recorded position and vessel motion parameters for later post-processing. Sound-velocity profiles were collected throughout the survey days with a Castaway CTD. Post-processed POS-MV Smoothed Best Estimate of Trajectory (SBET) files were merged with the survey line files using BathySwath software and then the line files were imported into SonarWiz software. Acoustic-backscatter data were processed using SonarWiz software techniques and gridded into 1-m resolution images. The images were exported as Erdas Imagine files in UTM zone 10, WGS-84 coordinates and imported into a GIS (ArcGIS Pro). The images were then projected to UTM zone 10, NAD83(2011) coordinates using ArcTools raster projection tool. The images were exported as a GeoTIFF file in UTM zone 10, NAD83(2011) coordinates. Process_Date: 2025 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 3343 Column_Count: 1266 Vertical_Count: 1 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: -123.00000 Latitude_of_Projection_Origin: 0.00000 False_Easting: 500000.0 False_Northing: 0.00 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 1.0 Ordinate_Resolution: 1.0 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983, 2011 realization (NAD83(2011)) Ellipsoid_Name: GRS80 Semi-major_Axis: 6378137.00 Denominator_of_Flattening_Ratio: 298.257222101 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Attribute Table Entity_Type_Definition: backscatter intensity as a digital value Entity_Type_Definition_Source: Producer defined Attribute: Attribute_Label: Value Attribute_Definition: Acoustic-backscatter value. No data value is -9999. Attribute_Definition_Source: Producer Defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 274 Attribute_Units_of_Measure: none Overview_Description: Entity_and_Attribute_Overview: The complete 1-m resolution of south San Francisco Bay backscatter raster is an 8-bit integer raster. It has a minimum (least reflective) value of 0 and a maximum (most reflective) value of 274. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey 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: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Resource_Description: These data are available in GeoTIFF format, accompanied by CSDGM FGDC-compliant metadata. The survey dates and type of sonar used in the surveys are denoted in the filenames according to the following convention: yyyy_mm_dd_bs.tif, where "yyyy" denotes the survey year, "mm" denotes the survey month, and "dd" is the final day of data collection. 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: Globalmapper (version 23.0) Format_Information_Content: Downloadable zip file contains the TIFF (.tif) version of the acoustic-backscatter data and a projection file (.tfw). File_Decompression_Technique: WinZip Transfer_Size: 5.4 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P14D723N Access_Instructions: Data and metadata can be downloaded using the Network_Resource_Name link and scrolling down to the Sidescan Data section. 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: 20250820 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