Metadata: Identification_Information: Citation: Citation_Information: Originator: Theresa A. Fregoso Originator: Amy C. Foxgrover Originator: Bruce E. Jaffe Publication_Date: 20230405 Title: Bathymetric change of Central San Francisco Bay, California: 1971 to 2020 Geospatial_Data_Presentation_Form: Raster Digital Data Set Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9Y5PEV0 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/P9Y5PEV0 Online_Linkage: https://www.sciencebase.gov/catalog/item/632b683ed34e900e86c509db Larger_Work_Citation: Citation_Information: Originator: Theresa A. Fregoso Originator: Bruce E. Jaffe Originator: Amy C. Foxgrover Publication_Date: 2023 Title: Bathymetric change analysis in San Francisco Bay, California, from 1971 to 2020 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9Y5PEV0 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/P9Y5PEV0 Description: Abstract: This 25-m-resolution surface presents bathymetric change of Central San Francisco Bay, California (hereafter referred to as Central Bay). This surface compares a 1-m-resolution digital elevation model (DEM) of the central portion of San Francisco Bay (Fregoso and others, 2021), comprised of bathymetry data in the Central Bay region from the time period referred to as the 2010s because the majority of the surveys were in that decade, to a 25-m-resolution DEM of Central Bay comprised of historic surveys from 1971 to 1984 (referred to as the 1980s because the majority of the surveys were in that decade). The creation of this change surface involved the resampling of the 1-m-resolution 2010s DEM to match the 25-m-resolution 1980s Central Bay DEM. Adjusting the 1990 surface to account for the modern tidal cycle while also applying a bias correction in attempts to account for interpolation uncertainties. Purpose: These data are part of a sediment change analysis project of San Francisco Bay to understand current patterns of sediment gains and loss in efforts to help develop a sediment budget. These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems (GIS) or other software to identify changes in elevations between the two time periods. These data are not intended to be used for navigational purposes. Supplemental_Information: 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: 1971 Ending_Date: 2020 Currentness_Reference: ground condition Status: Progress: In work Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -122.516883 East_Bounding_Coordinate: -122.196019 North_Bounding_Coordinate: 37.989176 South_Bounding_Coordinate: 37.722243 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: digital elevation models Theme_Keyword: coastal processes Theme_Keyword: bathymetry Theme_Keyword: topography Theme_Keyword: geographic information systems Theme_Keyword: geospatial datasets Theme_Keyword: single-beam echo sounder Theme_Keyword: multibeam sonar Theme_Keyword: GPS measurement Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: Bathymetry and Elevation Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: geographic information systems (GIS) Theme_Keyword: single-beam echo sounder Theme_Keyword: multibeam echo sounder Theme_Keyword: topographic mapping Theme_Keyword: Global Positioning System (GPS) observations Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: elevation Theme_Keyword: inlandWaters Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:632b683ed34e900e86c509db Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: San Francisco Bay Place: Place_Keyword_Thesaurus: none Place_Keyword: Central Bay 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: https://www.sciencebase.gov/catalog/file/get/632b683ed34e900e86c509db?name=CentralBay_Bathychange_1971_2020_25m.jpg&allowOpen=true Browse_Graphic_File_Description: Map showing bathymetric change of Central Bay, from 1971 to 2020, in meters. Browse_Graphic_File_Type: JPEG Native_Data_Set_Environment: Microsoft Version 6.2 (Build 9200); Esri ArcGIS 10.8.1.14362 Cross_Reference: Citation_Information: Originator: International Hydrographic Organization (IHO) Publication_Date: 2008 Title: IHO standards for hydrographic surveys (5th ed.) Online_Linkage: https://www.iho.int/iho_pubs/standard/S-44_5E.pdf Cross_Reference: Citation_Information: Originator: Environmental Systems Research Institute, Inc (ESRI) Publication_Date: 2015 Title: Topo to Raster help page Online_Linkage: http://desktop.arcgis.com/en/desktop/latest/tools/3d-analyst-toolbox/topo-to-raster.htm Cross_Reference: Citation_Information: Originator: Environmental Systems Research Institute, Inc (ESRI) Publication_Date: 2021 Title: Aggregate (Spatial Analyst) Online_Linkage: https://desktop.arcgis.com/en/arcmap/latest/tools/spatial-analyst-toolbox/aggregate.htm Cross_Reference: Citation_Information: Originator: National Oceanic and Atmospheric Administration (NOAA) Publication_Date: 2019 Title: Vertical Datum Transformation (VDatum) Online_Linkage: https://vdatum.noaa.gov/welcome.html Cross_Reference: Citation_Information: Originator: Theresa A. Fregoso Originator: Amy C. Foxgrover Originator: Bruce E. Jaffe Publication_Date: 2008 Title: Sediment deposition, erosion, and bathymetric change in central San Francisco Bay: 1855-1979 Online_Linkage: https://doi.org/10.3133/ofr20081312 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: No formal attribute accuracy tests were conducted. Logical_Consistency_Report: No formal logical consistency tests were conducted. Completeness_Report: Data are 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: Data are as accurate as source data used. Users are advised to read the metadata record for the sources for horizontal accuracy details. No further accuracy tests were conducted. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Data are as accurate as source data used. Users are advised to read the metadata record for the sources for vertical accuracy details. No further accuracy tests were conducted. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Theresa A. Fregoso Originator: Bruce E. Jaffe Originator: Amy C. Foxgrover Publication_Date: 2021 Title: Digital elevation model (DEM) of Central San Francisco Bay, California, created using bathymetry data collected between 1999 and 2016 (MLLW) Geospatial_Data_Presentation_Form: Raster Digital Data Set 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/P9TJTS8M Type_of_Source_Media: Digital Resources Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 2009 Ending_Date: 2020 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: 2010s DEMS Source_Contribution: 2010s bathymetric DEM for comparison Source_Information: Source_Citation: Citation_Information: Originator: National Oceanic and Atmospheric Administration (NOAA) Publication_Date: 1976 Title: H09185 Geospatial_Data_Presentation_Form: xyz Publication_Information: Publication_Place: online Publisher: NOAA Online_Linkage: https://www.ngdc.noaa.gov/nos/H08001-H10000/H09815.html Type_of_Source_Media: Digital Resources Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1971 Ending_Date: 1971 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: H09185 Source_Contribution: data for 1980s bathymetric DEM for comparison Source_Information: Source_Citation: Citation_Information: Originator: National Oceanic and Atmospheric Administration (NOAA) Publication_Date: 1981 Title: H09793 Geospatial_Data_Presentation_Form: xyz Publication_Information: Publication_Place: online Publisher: NOAA Online_Linkage: https://www.ngdc.noaa.gov/nos/H08001-H10000/H09793.html Type_of_Source_Media: Digital Resources Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1978 Ending_Date: 1978 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: H09793 Source_Contribution: data for 1980s bathymetric DEM for comparison Source_Information: Source_Citation: Citation_Information: Originator: National Oceanic and Atmospheric Administration (NOAA) Publication_Date: 1981 Title: H09794 Geospatial_Data_Presentation_Form: xyz Publication_Information: Publication_Place: online Publisher: NOAA Online_Linkage: https://www.ngdc.noaa.gov/nos/H08001-H10000/H09794.html Type_of_Source_Media: Digital Resources Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1978 Ending_Date: 1978 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: H09794 Source_Contribution: data for 1980s bathymetric DEM for comparison Source_Information: Source_Citation: Citation_Information: Originator: National Oceanic and Atmospheric Administration (NOAA) Publication_Date: 1982 Title: H09810 Geospatial_Data_Presentation_Form: xyz Publication_Information: Publication_Place: online Publisher: NOAA Online_Linkage: https://www.ngdc.noaa.gov/nos/H08001-H10000/H09810.html Type_of_Source_Media: Digital Resources Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1979 Ending_Date: 1979 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: H09810 Source_Contribution: data for 1980s bathymetric DEM for comparison Source_Information: Source_Citation: Citation_Information: Originator: National Oceanic and Atmospheric Administration (NOAA) Publication_Date: 1981 Title: H09811 Geospatial_Data_Presentation_Form: xyz Publication_Information: Publication_Place: online Publisher: NOAA Online_Linkage: https://www.ngdc.noaa.gov/nos/H08001-H10000/H09811.html Type_of_Source_Media: Digital Resources Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1979 Ending_Date: 1979 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: H09811 Source_Contribution: data for 1980s bathymetric DEM for comparison Source_Information: Source_Citation: Citation_Information: Originator: National Oceanic and Atmospheric Administration (NOAA) Publication_Date: 1983 Title: H09819 Geospatial_Data_Presentation_Form: xyz Publication_Information: Publication_Place: online Publisher: NOAA Online_Linkage: https://www.ngdc.noaa.gov/nos/H08001-H10000/H09819.html Type_of_Source_Media: Digital Resources Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1979 Ending_Date: 1979 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: H09819 Source_Contribution: data for 1980s bathymetric DEM for comparison Source_Information: Source_Citation: Citation_Information: Originator: National Oceanic and Atmospheric Administration (NOAA) Publication_Date: 1985 Title: H09844 Geospatial_Data_Presentation_Form: xyz Publication_Information: Publication_Place: online Publisher: NOAA Online_Linkage: https://www.ngdc.noaa.gov/nos/H08001-H10000/H09844.html Type_of_Source_Media: Digital Resources Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1979 Ending_Date: 1981 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: H09844 Source_Contribution: data for 1980s bathymetric DEM for comparison Source_Information: Source_Citation: Citation_Information: Originator: National Oceanic and Atmospheric Administration (NOAA) Publication_Date: 1984 Title: H09869 Geospatial_Data_Presentation_Form: xyz Publication_Information: Publication_Place: online Publisher: NOAA Online_Linkage: https://www.ngdc.noaa.gov/nos/H08001-H10000/H09869.html Type_of_Source_Media: Digital Resources Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1980 Ending_Date: 1980 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: H09869 Source_Contribution: data for 1980s bathymetric DEM for comparison Source_Information: Source_Citation: Citation_Information: Originator: National Oceanic and Atmospheric Administration (NOAA) Publication_Date: 1982 Title: H09873 Geospatial_Data_Presentation_Form: xyz Publication_Information: Publication_Place: online Publisher: NOAA Online_Linkage: https://www.ngdc.noaa.gov/nos/H08001-H10000/H09873.html Type_of_Source_Media: Digital Resources Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1980 Ending_Date: 1981 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: H09873 Source_Contribution: data for 1980s bathymetric DEM for comparison Source_Information: Source_Citation: Citation_Information: Originator: National Oceanic and Atmospheric Administration (NOAA) Publication_Date: 1983 Title: H09927 Geospatial_Data_Presentation_Form: xyz Publication_Information: Publication_Place: online Publisher: NOAA Online_Linkage: https://www.ngdc.noaa.gov/nos/H08001-H10000/H09927.html Type_of_Source_Media: Digital Resources Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1981 Ending_Date: 1981 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: H09927 Source_Contribution: data for 1980s bathymetric DEM for comparison Source_Information: Source_Citation: Citation_Information: Originator: National Oceanic and Atmospheric Administration (NOAA) Publication_Date: 1984 Title: H10080 Geospatial_Data_Presentation_Form: xyz Publication_Information: Publication_Place: online Publisher: NOAA Online_Linkage: https://www.ngdc.noaa.gov/nos/H10001-H12000/H10080.html Type_of_Source_Media: Digital Resources Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1983 Ending_Date: 1983 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: H10080 Source_Contribution: data for 1980s bathymetric DEM for comparison Process_Step: Process_Description: Using ESRI’s Aggregate tool (Environmental Systems Research Institute, Inc., 2021), the 2010s DEM was converted to 25-m resolution. Source_Used_Citation_Abbreviation: 2010s DEM Process_Date: 2022 Source_Produced_Citation_Abbreviation: 2010s 25-m DEM Process_Step: Process_Description: 1980s Central Bay bathymetric DEM was constructed using steps from Fregoso and others (2008 Source_Used_Citation_Abbreviation: H09185 Source_Used_Citation_Abbreviation: H09793 Source_Used_Citation_Abbreviation: H09794 Source_Used_Citation_Abbreviation: H09810 Source_Used_Citation_Abbreviation: H09811 Source_Used_Citation_Abbreviation: H09819 Source_Used_Citation_Abbreviation: H09844 Source_Used_Citation_Abbreviation: H09869 Source_Used_Citation_Abbreviation: H09873 Source_Used_Citation_Abbreviation: H09927 Source_Used_Citation_Abbreviation: H10080 Process_Date: 2022 Source_Produced_Citation_Abbreviation: 1980s DEM Process_Step: Process_Description: The 1980s DEM was adjusted for changes in tidal epoch and grid bias by subtracting 7 cm for tidal change and adding a negative 5 for bias adjustment. The resulting grid was snapped to the 2010s 25-m DEM. Source_Used_Citation_Abbreviation: 1980s DEM Source_Used_Citation_Abbreviation: 2010s 25-m DEM Process_Date: 2022 Source_Produced_Citation_Abbreviation: 1980s ADJ DEM Process_Step: Process_Description: The 1980s adjusted DEM was subtracted from the 25-m 2010s DEM to determine bathymetric changes in the intervening decades. Source_Used_Citation_Abbreviation: 1980s ADJ DEM Source_Used_Citation_Abbreviation: 2010s 25-m DEM Process_Date: 2022 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 1177 Column_Count: 1121 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: -123.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 25.0 Ordinate_Resolution: 25.0 Planar_Distance_Units: Meter Geodetic_Model: Horizontal_Datum_Name: D_NAD_1983_2011 Ellipsoid_Name: GRS_1980 Semi-major_Axis: 6378137.0 Denominator_of_Flattening_Ratio: 298.257222101 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: floating point Entity_Type_Definition: GeoTiff with change in depth data associated with the digital elevation model (DEM) relative to MLLW. Cells with values of -3.4028231e+38 indicate no data. Entity_Type_Definition_Source: Producer defined Attribute: Attribute_Label: Value Attribute_Definition: Change in depth relative to MLLW, negative values indicate erosion and deeper surface in 2010s, positive values indicate deposition and a shallower surface in 2010s. Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -16.657320022583 Range_Domain_Maximum: 23.21711730957 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.01 Overview_Description: Entity_and_Attribute_Overview: Bathymetric change in meters from the 1980s to the 2010s in Central San Francisco Bay, California. Entity_and_Attribute_Detail_Citation: The entity and attribute information were generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey - ScienceBase Contact_Address: Address_Type: mailing and physical Address: Denver Federal Center, Building 810, Mail Stop 302 City: Denver State_or_Province: CO Postal_Code: 80225 Country: US Contact_Voice_Telephone: 1-888-275-8747 Contact_Electronic_Mail_Address: sciencebase@usgs.gov Resource_Description: These data are available as a GeoTiff (CentralBay_Bathychange_1971- 2020_25m.tif) with accompanying files and 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 10.8.1 Format_Information_Content: Zip file contains a GeoTiff version of the change surface with associated tif world file (.tfw), a browse graphic, and FGDC-compliant metadata. File_Decompression_Technique: Data can be unpacked using WinZip, or other zip decompression software. Transfer_Size: 5.90 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://doi.org/10.5066/P9Y5PEV0 Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/632b683ed34e900e86c509db Network_Resource_Name: https://www.sciencebase.gov/catalog/item/632b683ed34e900e86c509db Access_Instructions: Data can be downloaded using the Network_Resource_Name links. The first link begins a direct download of the DEM data, including metadata and a browse graphic. The second link points to the landing page for information about the DEM for the central portion of San Francisco Bay. The third link points to the landing page for the entire data release. Fees: None Technical_Prerequisites: These data can be viewed with ArcGIS software. Metadata_Reference_Information: Metadata_Date: 20230405 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