Metadata: Identification_Information: Citation: Citation_Information: Originator: Theresa A. Fregoso Originator: Bruce E. Jaffe Originator: Amy C. Foxgrover Publication_Date: 20200117 Title: Digital elevation model (DEM) of northern San Francisco Bay, California, created using bathymetry data collected between 1999 and 2016 (NAVD88) Geospatial_Data_Presentation_Form: Raster Digital Data Set Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9TJTS8M Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA Publisher: U.S. Geological Survey Online_Linkage: https://www.sciencebase.gov/catalog/file/get 5e1cb737e4b0ecf25c5f0bf6 Online_Linkage: https://doi.org/10.5066/P9TJTS8M Larger_Work_Citation: Citation_Information: Originator: Theresa A. Fregoso Originator: Bruce E. Jaffe Originator: Amy C. Foxgrover Publication_Date: 2020 Title: High-resolution (1 m) digital elevation model (DEM) of San Francisco Bay, California, created using bathymetry data collected between 1999 and 2016 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P9TJTS8M 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 Online_Linkage: https://www.sciencebase.gov/catalog/item/5e0592d6e4b0b207aa094f2a Description: Abstract: A 1-m resolution, continuous surface, bathymetric digital elevation model (DEM) of the northern portion of San Francisco Bay, which includes San Pablo Bay, Carquinez Strait, and portions of Suisun Bay, was constructed from bathymetric surveys collected from 1999 to 2016. In 2014 and 2015 the California Ocean Protection Council (OPC) contracted the collection of bathymetric surveys of large portions of San Francisco Bay. A total of 93 surveys were collected using a combination of multibeam and interferometric side-scan sonar systems. Of those 93 surveys, 75 consist of swaths of data ranging from 18- to just over 100-meters wide. These swaths were separated by data gaps ranging from 10- to just over 300-meters wide. The no-data areas required interpolation to create a continuous surface. The OPC surveys were combined with additional datasets collected by the United States Geological Survey (USGS), National Oceanic and Atmospheric Administration (NOAA), NOAA’s National Ocean Service (NOS), and the United States Army Corps of Engineers (USACE) to create a continuous, high-resolution digital elevation model (DEM). The creation of this DEM refines techniques developed by the USGS to create DEMs from historic bathymetric data, and allow for the creation of a modern-day bathymetric surface that can be compared to earlier surveys to delineate regions of sediment erosion and deposition. Purpose: These data were compiled using new techniques to create a high-resolution DEM of the northern portion of San Francisco Bay, which will be used to document and assess changes in seafloor morphology. 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 elevations. These data are not intended to be used for navigational purposes. Supplemental_Information: Additional information about the USGS field activity from which some of these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2015-633-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: 1999 Ending_Date: 2016 Currentness_Reference: ground condition Status: Progress: In work Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -122.494946625 East_Bounding_Coordinate: -121.863425774 North_Bounding_Coordinate: 38.136493633 South_Bounding_Coordinate: 37.954045436 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:5e1cb737e4b0ecf25c5f0bf6 Theme: Theme_Keyword_Thesaurus: The National Map Collection Thesaurus Theme_Keyword: Digital Elevation Model (DEM) 1 meter Theme_Keyword: Lidar Point Cloud (LPC) Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: digital elevation models Theme_Keyword: bathymetry Theme_Keyword: lidar 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 Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: San Francisco Bay Place_Keyword: San Pablo Bay Place_Keyword: Suisun Bay Place_Keyword: Carquinez Strait Access_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. Use_Constraints: None. Users are advised to read the data set's metadata thoroughly to understand appropriate use and data limitations. 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/5e1cb737e4b0ecf25c5f0bf6?name=NorthSFBay_DEM_Mosaic_NAVD88_1m.jpg&allowOpen=true Browse_Graphic_File_Description: Bathymetric map of the northern portion of San Francisco Bay (NAVD88). Browse_Graphic_File_Type: JPEG Native_Data_Set_Environment: Microsoft Version 6.2 (Build 9200); Esri ArcGIS 10.6.1 (Build 9270) Service Pack N/A (Build N/A) 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: 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://pubs.er.usgs.gov/publication/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 set 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: Data is as accurate as source data used. No further tests were conducted, and no claims are made to positional accuracy. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Data is as accurate as source data used. No further tests were conducted, and no claims are made to vertical accuracy. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Theresa A. Fregoso Publication_Date: 2020 Title: Footprints and producers of source data used to create northern portion of the high-resolution (1 m) San Francisco Bay, California, digital elevation model (DEM) Geospatial_Data_Presentation_Form: Vector Digital Data Set Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA Publisher: U.S. Geological Survey Online_Linkage: https://www.sciencebase.gov/catalog/item/5e169180e4b0ecf25c57fb1a 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: 1999 Ending_Date: 2016 Source_Currentness_Reference: ground condition Source_Citation_Abbreviation: Source DEMS Source_Contribution: Footprints of bathymetric source DEMS used to create high-resolution San Francisco Bay bathymetric surface. Process_Step: Process_Description: Using ArcGIS, the source DEMs were displayed and areas that would need further interpolation were identified. The lineage, vertical datum, and resolution of each DEM surface were noted for order of precedence when constructing the combined DEM and need for resampling or datum conversions. Using the ArcGIS Mosaic to New Raster tool, the surveys that were from the same sources, and were not continuous surfaces, were assembled into two separate DEMs for areas both north and south of the channel in San Pablo Bay. Elevation contours were digitized across the two DEMs to constrain the interpolation across data gaps in intervals of 20 centimeters across broader shallower areas (generally in water depths less than 4 m), and in intervals of 1 meter in deeper areas. The two sections were converted from raster to points to use as inputs in the interpolation process. Using the ArcGIS Topo to Raster tool (ESRI 2015), the two sections of north and south point data were used, along with the newly drawn contours, to interpolate continuous DEMs at a resolution of 1 meter, using the contour as the primary interpolation constraint. The DEM for Carquinez Strait was one of three DEMs interpolated from single beam data. These DEMs were interpolated using the Topo to Raster method as described in Fregoso and others (2008). The Carquinez Strait section was the only section that was able to make use of topographic lidar for shallower sections adjacent to the shore. The channel data for San Pablo Bay and Suisun Bay are primarily multibeam data with varying resolutions, and in a different vertical datum from the rest of the data used in this project. The data were resampled to 1 meter using the resample tool in ArcGIS, and then converted to NAVD88 using NOAA’s VDATUM tool (https://vdatum.noaa.gov/). There were a few areas with data gaps that were filled using the Topo to Raster method from above. Once all data were in the same horizontal (UTM NAD83) and vertical (NAVD88) datums, the different DEMs were fitted together into a seamless DEM using the ArcGIS Mosaic to new Raster tool. In areas with obvious discrepancies between DEMs, edges were smoothed by clipping out a narrow gap between surveys then using contours and the Topo to Raster tool. The final pieces were all put together using the Mosaic to new Raster tool, and VDATUM was again used to create versions in both Mean Lower Low Water (MLLW) and NAVD88. The VDATUM tool did not have the full extents of the NAVD88 version available for conversion, so the outlines of the San Pablo Bay region do not match in both versions. Source_Used_Citation_Abbreviation: Source DEMS Process_Date: 20191214 Process_Step: Process_Description: Edit was made to correct the Attribute Definition of the 'Value' attribute (from 'Elevation relative to MLLW' to 'Elevation relative to NAVD88'). No data were changed. Users are advised to compare the metadata date of this file to any similar file to ensure they are using the most recent version. Process_Date: 20191227 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Susan A Cochran Contact_Organization: U.S. Geological Survey, Pacific Coastal and Marine Science Center Contact_Address: Address_Type: mailing and physical Address: 2885 Mission St. City: Santa Cruz State_or_Province: CA Postal_Code: 95060 Country: United States Contact_Voice_Telephone: 831-460-7545 Contact_Electronic_Mail_Address: scochran@usgs.gov Process_Step: Process_Description: Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. Process_Date: 20201019 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: VeeAnn A. Cross Contact_Position: Marine Geologist Contact_Address: Address_Type: Mailing and Physical Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Contact_Voice_Telephone: 508-548-8700 x2251 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 19758 Column_Count: 55243 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: 1.0 Ordinate_Resolution: 1.0 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: North American Vertical Datum 1988 (NAVD88) 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: floating point Entity_Type_Definition: GeoTiff with elevation data associated with the digital elevation model (DEM) relative to NAVD88. Cells with values of -3.4028231e+38 indicate no data. Entity_Type_Definition_Source: Producer defined Attribute: Attribute_Label: Value Attribute_Definition: Elevation relative to NAVD88 Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -40.607852935791 Range_Domain_Maximum: 20.070146560669 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.01 Overview_Description: Entity_and_Attribute_Overview: DEM in meters using NADV88 datum showing bathymetric elevations of the northern portion of 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 (NorthSFBay_DEM_Mosaic_NAVD88_1m.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 10.6.1 Format_Information_Content: Zip file contains a GeoTiff version of the DEM with associated file, a browse graphic, and FGDC-compliant metadata. File_Decompression_Technique: Data can be unpacked using WinZip, or other zip decompression software. Transfer_Size: 1074 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5e1cb737e4b0ecf25c5f0bf6 Network_Resource_Name: https://www.sciencebase.gov/catalog/item/5e1cb737e4b0ecf25c5f0bf6 Network_Resource_Name: https://doi.org/10.5066/P9TJTS8M Access_Instructions: Data can be downloaded using the Network_Resource_Name links. The first link begins a direct download of the DEM data. The second link points to the landing page for information about the NAVD88 version of the DEM for the northern 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: 20201019 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