{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "PCMSC Science Data Coordinator", "hasEmail": "mailto:pcmsc_data@usgs.gov"}, "description": "This data release provides a series of five bathymetric digital elevation models (DEMs) of Suisun Bay, CA generated from single-beam hydrographic surveys collected from 1866 to 1990. The DEMs were constructed based upon historical United States Coast and Geodetic Survey and National Ocean Service (NOS) surveys collected in 1866, 1886, 1923, 1941, and 1990. Depth soundings from the pre-1930s surveys were manually digitized and georeferenced while the later surveys were obtained in digital format, and all information compiled into a geographic information system (GIS). Using surface modeling software, the soundings from each survey were supplemented with hand-drawn contours and shorelines obtained from topographic sheets to generate bathymetric DEMs at a horizontal resolution of 25 m. The bathymetric DEMs are provided in GeoTIFF format, vertically referenced to the Mean Lower Low Water (MLLW) tidal epoch referenced at the time of data collection.", "distribution": [{"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.667605c1d34e3cf50fef28f6.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}, {"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P13H35QB", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_667605c1d34e3cf50fef28f6", "keyword": ["inlandWaters", "Bathymetry and Elevation", "geographic information systems (GIS)", "South San Francisco Bay", "Suisun Bay", "geospatial datasets", "USGS:667605c1d34e3cf50fef28f6", "topographic mapping", "GPS measurement", "Digital Elevation Model (DEM)", "San Pablo Bay", "geographic information systems", "bathymetry", "elevation", "topography", "single-beam echo sounder", "San Francisco Bay", "digital elevation models", "Central San Francisco Bay", "Global Positioning System (GPS) observations"], "modified": "2025-07-30T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-121.747071, 38.0099650, -122.270970, 38.1721906", "theme": ["geospatial"], "title": "Suisun Bay bathymetry: 1866 to 1990"}