San Francisco Bay-Delta bathymetric/topographic digital elevation model (DEM)

Dates

Publication Date: 2017-02-27
Time Period: 2016

Citation

Fregoso, T.A., Wang, R-F, Alteljevich, E., and Jaffe, B.E., 2017, San Francisco Bay-Delta bathymetric/topographic digital elevation model (DEM): U.S. Geological Survey data release, https://doi.org/10.5066/F7GH9G27.

Summary

A high-resolution (10-meter per pixel) digital elevation model (DEM) was created for the Sacramento-San Joaquin Delta using both bathymetry and topography data relative to current modern datum of North American Vertical Datum of 1988 (NAVD88). This DEM is the result of collaborative efforts of the U.S. Geological Survey (USGS) and the California Department of Water Resources (DWR). The base of the DEM is from a 10-m DEM released in 2004 and updated in 2005 (Foxgrover and others, 2005) that used Environmental Systems Research Institute (ESRI), ArcGIS Topo to Raster module to interpolate grids from single beam bathymetric surveys collected by DWR, the Army Corp of Engineers (COE), the National Oceanic and Atmospheric Administration [...]

Summary

A high-resolution (10-meter per pixel) digital elevation model (DEM) was created for the Sacramento-San Joaquin Delta using both bathymetry and topography data relative to current modern datum of North American Vertical Datum of 1988 (NAVD88). This DEM is the result of collaborative efforts of the U.S. Geological Survey (USGS) and the California Department of Water Resources (DWR).

The base of the DEM is from a 10-m DEM released in 2004 and updated in 2005 (Foxgrover and others, 2005) that used Environmental Systems Research Institute (ESRI), ArcGIS Topo to Raster module to interpolate grids from single beam bathymetric surveys collected by DWR, the Army Corp of Engineers (COE), the National Oceanic and Atmospheric Administration (NOAA), and the USGS, into a continuous surface. The Topo to Raster interpolation method was specifically designed to create hydrologically correct DEMs from point, line, and polygon data (Environmental Systems Research Institute, Inc., 2015). Elevation contour lines were digitized based on the single beam point data for control of channel morphology during the interpolation process. Checks were performed to ensure that the interpolated surfaces honored the source bathymetry, and additional contours and (or) point data were added as needed to help constrain the data. The original data were collected in the tidal datum Mean Lower or Low Water (MLLW) or the National Geodetic Vertical Datum of 1929 (NGVD29), and all were brought to NGVD29.

The 2005 USGS DEM was updated by DWR, first by converting the DEM to NAVD88 and then by following the methodology of the USGS DEM, established for the 2005 DEM (Foxgrover and others, 2005) for adding newly collected single and multibeam bathymetric data. They then included topographic data from lidar surveys, providing the first DEM that included the land/water interface (Wang and Ateljevich, 2012).

The USGS further updated and expanded the DWR DEM with the inclusion of USGS interpolated sections of single beam bathymetry data collected by the COE and USGS scientists, expanding the DEM to include the northernmost areas of the Sacramento-San Joaquin Delta, and by making use of a two-meter seamless bathymetric/topographic DEM from the USGS EROS Data Center (2013) of the San Francisco Bay region.

The resulting 10-meter USGS DEM encompasses the entirety of Suisun Bay, beginning with the Carquinez Strait in the west, east to California Interstate 5, north following the path of the Yolo Bypass and the Sacramento River up to Knights Landing, and the American River northeast to the Nimbus Dam, and south to areas around Tracy. The DEM incorporates the newest available bathymetry data at the time of release, as well as including, at minimum, a 100-meter band of available topography data adjacent to most shorelines. No data areas within the DEM are areas where no elevation data exists, either due to a gap in the land/water interface, or because lidar was collected over standing water that was then cut out of the DEM.

Environmental Systems Research Institute, Inc., 2015, Topo to Raster: http://desktop.arcgis.com/en/desktop/latest/tools/3d-analyst-toolbox/topo-to-raster.htm

Foxgrover, A., Smith, R.E., and Jaffe, B.E., 2005, Suisun Bay and Delta Bathymetry: http://sfbay.wr.usgs.gov/sediment/delta/index.html

USGS EROS Data Center, 2013, 2 m Coastal National Elevation Dataset: http://topotools.cr.usgs.gov/topobathy_viewer/

Wang, R-F., and Ateljevich, E., 2012, A continuous surface elevation map for modeling, chapter 6 in California Department of Water Resources, Methodology for flow and salinity estimates in the Sacramento-San Joaquin Delta and Suisun Marsh, 33rd Annual Progress Report to the State
Water Resources Control Board: California Department of Water Resources, Bay-Delta Office, Delta Modeling Section, http://baydeltaoffice.water.ca.gov/modeling/deltamodeling/AR2012/Chapter%206_2012_Web.pdf

Contacts

Point of Contact :: Theresa Fregoso
Originator :: Theresa Fregoso, Rueen-Fang Wang, Eli Alteljevich, Bruce E Jaffe
Metadata Contact :: Theresa Fregoso
Publisher :: U.S. Geological Survey, Coastal and Marine Geology Program
USGS Mission Area :: Natural Hazards
SDC Data Owner :: Pacific Coastal and Marine Science Center
Distributor :: U.S. Geological Survey - ScienceBase

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SFBayDeltaDEM10m2016.xml Original FGDC Metadata	View	29.81 KB	application/fgdc+xml
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sfbaydeltadem10m2016.prj		135 Bytes	text/plain
SFBayDeltaDEM10m2016.jpg		1,018.71 KB	image/jpeg

Related External Resources

Type: Related Primary Publication

Fregoso, T.A., Wang, R-F. T., Ateljevich, E.S., and Jaffe, B.E., 2017, A new seamless, high-resolution digital elevation model of the San Francisco Bay-Delta Estuary, California: U.S. Geological Survey Open-File Report 2017–1067, 27 p., https://doi.org/10.3133/ofr20171067.	https://doi.org/10.3133/ofr20171067

Purpose

These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems or other software to identify elevations. These data are not intended to be used for navigational purposes.

San Francisco Bay-Delta bathymetric/topographic digital elevation model (DEM)

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