Theresa A. Fregoso Bruce E. Jaffe Amy C. Foxgrover 20200117 Raster Digital Data Set data release DOI:10.5066/P9TJTS8M Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://www.sciencebase.gov/catalog/file/get 5e1cb737e4b0ecf25c5f0bf6 https://doi.org/10.5066/P9TJTS8M Theresa A. Fregoso Bruce E. Jaffe Amy C. Foxgrover 2020 data release DOI:10.5066/P9TJTS8M Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/P9TJTS8M https://www.sciencebase.gov/catalog/item/5e0592d6e4b0b207aa094f2a 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. 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. 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. 1999 2016 ground condition In work As needed -122.494946625 -121.863425774 38.136493633 37.954045436 USGS Metadata Identifier USGS:5e1cb737e4b0ecf25c5f0bf6 The National Map Collection Thesaurus Digital Elevation Model (DEM) 1 meter Lidar Point Cloud (LPC) USGS Thesaurus digital elevation models bathymetry lidar topography geographic information systems geospatial datasets single-beam echo sounder multibeam sonar GPS measurement Data Categories for Marine Planning Bathymetry and Elevation Marine Realms Information Bank (MRIB) keywords geographic information systems (GIS) single-beam echo sounder multibeam echo sounder topographic mapping Global Positioning System (GPS) observations ISO 19115 Topic Category elevation inlandWaters Geographic Names Information System (GNIS) San Francisco Bay San Pablo Bay Suisun Bay Carquinez Strait 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. None. Users are advised to read the data set's metadata thoroughly to understand appropriate use and data limitations. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov https://www.sciencebase.gov/catalog/file/get/5e1cb737e4b0ecf25c5f0bf6?name=NorthSFBay_DEM_Mosaic_NAVD88_1m.jpg&allowOpen=true Bathymetric map of the northern portion of San Francisco Bay (NAVD88). JPEG Microsoft Version 6.2 (Build 9200); Esri ArcGIS 10.6.1 (Build 9270) Service Pack N/A (Build N/A) International Hydrographic Organization (IHO) 2008 https://www.iho.int/iho_pubs/standard/S-44_5E.pdf Environmental Systems Research Institute, Inc (ESRI) 2015 http://desktop.arcgis.com/en/desktop/latest/tools/3d-analyst-toolbox/topo-to-raster.htm National Oceanic and Atmospheric Administration (NOAA) 2019 https://vdatum.noaa.gov/welcome.html Theresa A. Fregoso Amy C. Foxgrover Bruce E. Jaffe 2008 https://pubs.er.usgs.gov/publication/ofr20081312 No formal attribute accuracy tests were conducted. No formal logical consistency tests were conducted. 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. Data is as accurate as source data used. No further tests were conducted, and no claims are made to positional accuracy. Data is as accurate as source data used. No further tests were conducted, and no claims are made to vertical accuracy. Theresa A. Fregoso 2020 Vector Digital Data Set Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://www.sciencebase.gov/catalog/item/5e169180e4b0ecf25c57fb1a https://doi.org/10.5066/P9TJTS8M Digital Resources 1999 2016 ground condition Source DEMS Footprints of bathymetric source DEMS used to create high-resolution San Francisco Bay bathymetric surface. 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 DEMS 20191214 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. 20191227 Susan A Cochran U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical

2885 Mission St.

Santa Cruz CA 95060 United States 831-460-7545 scochran@usgs.gov Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. 20201019 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Raster Grid Cell 19758 55243 1 Universal Transverse Mercator 10 0.9996 -123.0 0.0 500000.0 0.0 row and column 1.0 1.0 Meter D_NAD_1983_2011 GRS_1980 6378137.0 298.257222101 North American Vertical Datum 1988 (NAVD88) 0.01 meters Explicit elevation coordinate included with horizontal coordinates floating point GeoTiff with elevation data associated with the digital elevation model (DEM) relative to NAVD88. Cells with values of -3.4028231e+38 indicate no data. Producer defined Value Elevation relative to NAVD88 Producer defined -40.607852935791 20.070146560669 meters 0.01 DEM in meters using NADV88 datum showing bathymetric elevations of the northern portion of San Francisco Bay, California. 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. U.S. Geological Survey - ScienceBase mailing and physical

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 US 1-888-275-8747 sciencebase@usgs.gov These data are available as a GeoTiff (NorthSFBay_DEM_Mosaic_NAVD88_1m.tif) with accompanying files and FGDC-compliant metadata. 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. geoTIFF ArcGIS 10.6.1 Zip file contains a GeoTiff version of the DEM with associated file, a browse graphic, and FGDC-compliant metadata. Data can be unpacked using WinZip, or other zip decompression software. 1074 https://www.sciencebase.gov/catalog/file/get/5e1cb737e4b0ecf25c5f0bf6 https://www.sciencebase.gov/catalog/item/5e1cb737e4b0ecf25c5f0bf6 https://doi.org/10.5066/P9TJTS8M 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. None These data can be viewed with ArcGIS software. 20201019 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998