Theresa A. Fregoso Amy C. Foxgrover Bruce E. Jaffe 20240709 Raster Digital Data Set data release DOI:10.5066/P1332UUW Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/P1332UUW https://www.sciencebase.gov/catalog/item/665a1b61d34ef3137d36a713 Theresa A. Fregoso Bruce E. Jaffe Amy C. Foxgrover 2024 2.0 data release DOI:10.5066/P1332UUW Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/P1332UUW https://www.sciencebase.gov/catalog/item/665a1ad3d34ef3137d36a6f5 This 25-m-resolution surface presents bathymetric change of San Pablo Bay, California, from 1983 to 2015. This surface compares a 1-m-resolution digital elevation model (DEM) of the northern portion of San Francisco Bay (Fregoso and others, 2020), comprised of bathymetry data in the San Pablo 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 bathymetric DEM of San Pablo Bay comprised of historic surveys from 1983 to 1986 (referred to as the 1980s because the majority of the surveys were in that decade). Prior to creating this change surface, the 1-m-resolution 2010s DEM was resampled to match the 25-m-resolution 1980s DEM, and the 1980s DEM corrected for grid interpolation bias and vertically referenced to the same tidal epoch as the 2010s DEM. The adjusted DEMs were then differenced to reveal amounts of sediment deposition and erosion that occurred between the surveys. 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. 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. 1983 2015 ground condition Complete None planned -122.515103 -122.243750 38.136755 37.951480 USGS Thesaurus digital elevation models coastal processes bathymetry 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 USGS Metadata Identifier USGS:665a1b61d34ef3137d36a713 Geographic Names Information System (GNIS) San Francisco Bay San Pablo Bay No 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. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

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Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov https://www.sciencebase.gov/catalog/file/get/665a1b61d34ef3137d36a713?name=SanPabloBay_Bathychange_1983_2015.jpg&allowOpen=true Map showing bathymetric change of San Pablo Bay, from 1983 to 2015, in meters. JPEG Microsoft Version 6.2 (Build 9200); Esri ArcGIS 10.8.1.14362 Environmental Systems Research Institute, Inc (ESRI) 2021 https://desktop.arcgis.com/en/arcmap/latest/tools/spatial-analyst-toolbox/aggregate.htm Bruce E. Jaffe Richard Smith Laura Zink Torresan 1998 https://doi.org/10.3133/ofr98759 No formal attribute accuracy tests were conducted. No formal logical consistency tests were conducted. 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. 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. 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. Theresa A. Fregoso Bruce E. Jaffe Amy C. Foxgrover 2020 Raster Digital Data Set Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/P9TJTS8M Digital Resources 1999 2016 ground condition 2010s DEM 2010s DEM of northern San Francisco Bay (MLLW) used for comparison National Oceanic and Atmospheric Administration (NOAA) 1988 xyz online NOAA https://www.ngdc.noaa.gov/nos/H10001-H12000/H10223.html Digital Resources 1986 1987 ground condition H10223 data for 1980s bathymetric DEM for comparison National Oceanic and Atmospheric Administration (NOAA) 1987 xyz online NOAA https://www.ngdc.noaa.gov/nos/H10001-H12000/H10182.html Digital Resources 1985 1986 ground condition H10182 data for 1980s bathymetric DEM for comparison National Oceanic and Atmospheric Administration (NOAA) 1985 xyz online NOAA https://www.ngdc.noaa.gov/nos/H10001-H12000/H10081.html Digital Resources 1983 1983 ground condition H10081 data for 1980s bathymetric DEM for comparison National Oceanic and Atmospheric Administration (NOAA) 1984 xyz online NOAA https://www.ngdc.noaa.gov/nos/H10001-H12000/H10082.html Digital Resources 1983 1983 ground condition H10082 data for 1980s bathymetric DEM for comparison National Oceanic and Atmospheric Administration (NOAA) 1984 xyz online NOAA https://www.ngdc.noaa.gov/nos/H10001-H12000/H10080.html Digital Resources 1983 1983 ground condition H10080 data for 1980s bathymetric DEM for comparison Using ESRI’s Aggregate tool (Environmental Systems Research Institute, Inc., 2021), the 2010s DEM was converted to 25-m resolution. 2010s DEM 2022 2010s 25-m DEM 1980s San Pablo Bay bathymetric DEM was constructed using steps from Jaffe and others (1998) H10223 H10182 H10081 H10082 H10080 2022 1980s DEM The 1980s DEM was adjusted for changes in tidal epoch and grid bias by subtracting 4.3 cm for tidal change and subtracting 1.4 cm for bias adjustment. The resulting grid was snapped to the 2010s 25-m DEM. 1980s DEM 2010s 25-m DEM 2022 1980s ADJ DEM The 1980s adjusted DEM was subtracted from the 25-m 2010s DEM to determine bathymetric changes in the intervening decades. 1980s ADJ DEM 2010s 25-m DEM 2022 1980s-2010s Chg Edits were made to the GeoTIFF’s internal projection assignment and to the altitude datum listed in the metadata. Although the horizontal datum and projection information were correctly defined as NAD83(2011) / UTM Zone 10 within the metadata files, the Geographic Coordinate System (GCS) and associated DATUM definition description stored internally, within the GeoTIFF itself, was incorrect. The originally assigned GCS was corrected from GCS_GRS_1980 to NAD 1983 (2011) and the projected coordinate system (PCS) from GRS_1980_UTM_Zone_10N to NAD 1983 (2011) UTM Zone 10N. Please note that the coordinate values and position of the GeoTIFF pixels did not change, only the projection definition. Within the metadata, the Altitude Datum Name, previously listed as Mean Lower Low Water (MLLW), was corrected. Although the input bathymetric DEMs are both referenced to MLLW, the change grid represents relative change between the two time periods and is not directly referenced to MLLW. This clarification was also applied to the Entity Type and Attribute Definition fields. The last two sentences of the abstract were edited to clarify that the 1980s DEM was corrected for both grid interpolation bias and a tidal datum adjustment prior to calculating the change DEM. The metadata available from a harvester may supersede metadata bundled within a download file. Users are advised to compare the metadata date of this file to any similar file to ensure they are using the most recent version. (afoxgrover@usgs.gov) 1980s-2010s Chg 20240522 1980s-2010s Prj Raster Grid Cell 947 816 1 Universal Transverse Mercator 10 0.9996 -123.0 0.0 500000.0 0.0 row and column 25.0 25.0 Meter D_NAD_1983_2011 GRS_1980 6378137.0 298.257222101 N/A, change is relative to adjusted 1980s DEM 0.01 meters Attribute values floating point GeoTiff of bathymetric change between the 1980s to 2010s digital elevation models (DEMs), Z-value in meters. Cells with values of -3.4028231e+38 indicate no data. Producer defined Value Bathymetric change from 1980s to 2010s. Negative values indicate sediment erosion and positive values indicate sediment deposition. Producer defined -13.762254714966 5.4205708503723 meters 0.01 Bathymetric change in meters from the 1980s to the 2010s in San Pablo 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

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Denver CO 80225 US 1-888-275-8747 sciencebase@usgs.gov These data are available as a GeoTiff (SanPabloBay_BathyChange_1983_2015.tif) with accompanying world file (.tfw) 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 10.8.1 Zip file contains a GeoTiff version of the change surface with associated tif world file (.tfw) and a browse graphic. Data can be unpacked using WinZip, or other zip decompression software. 3.96 https://www.sciencebase.gov/catalog/file/get/665a1b61d34ef3137d36a713 https://www.sciencebase.gov/catalog/item/665a1b61d34ef3137d36a713 https://doi.org/10.5066/P1332UUW Data can be downloaded using the Network_Resource_Name links. The first link begins a direct download of the GeoTIFF, including a browse graphic. The second link points to the landing page for information about the bathymetric change DEM for San Pablo Bay. The third link points to the landing page for the entire data release. None These data can be viewed with GIS software. 20240709 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

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