Dataset description: Digital elevation model (DEM) of south San Francisco Bay, California, created using bathymetry data collected between 2005 and 2020 (MLLW)

A 1-m resolution, continuous surface, bathymetric digital elevation model (DEM) of the southern portion of San Francisco Bay, was constructed from bathymetric surveys collected from 2005 to 2020. 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 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.

Version	1
Keywords	topography, single-beam echo sounder, multibeam sonar, digital elevation models, geographic information systems, geospatial datasets, GPS measurement, bathymetry
Data types	Multibeam, Single Beam
Format	GeoTIFF;
Amount	1051 MB

Contacts

Contact	Theresa Fregoso PCMSC_data@usgs.gov

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Location of materials and files

Public files	https://www.sciencebase.gov/catalog/file/get/607df116d34e8564d67e3ae6 https://www.sciencebase.gov/catalog/item/607df116d34e8564d67e3ae6 https://doi.org/10.5066/P9TJTS8M
Metadata	https://cmgds.marine.usgs.gov/metadata/pcmsc/DataReleases/ScienceBase/DR_P9TJTS8M/SouthSFBay_DEM_Mosaic_MLLW_1m_metadata.xml Outline - Questions and answers - Text - XML

Activities and equipment

Activity	Equipment
S0111SF	SWATHplus 234.5 kHz interferometric sidescan
2016-678-FA	SWATH plus-M A Phase Measuring Bathymetric Sonar (PMBS) also known as an Interferometric Sidescan Sonar (ISS) with a frequency of 234.5 kHz.
2019-614-FA	SWATH plus-M A Phase Measuring Bathymetric Sonar (PMBS) also known as an Interferometric Sidescan Sonar (ISS) with a frequency of 234.5 kHz.