San Francisco Bay-Delta bathymetric/topographic digital elevation model (DEM)
Dataset Identification:
Resource Abstract:
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).<br> <br> 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.<br> <br>
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).<br> <br> 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.<br> <br> 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.<br> <br> Environmental Systems Research Institute, Inc., 2015, Topo
to Raster: http://desktop.arcgis.com/en/desktop/latest/tools/3d-analyst-toolbox/topo-to-raster.htm<br> <br> Foxgrover,
A., Smith, R.E., and Jaffe, B.E., 2005, Suisun Bay and Delta Bathymetry: http://sfbay.wr.usgs.gov/sediment/delta/index.html<br>
<br> USGS EROS Data Center, 2013, 2 m Coastal National Elevation Dataset: http://topotools.cr.usgs.gov/topobathy_viewer/<br>
<br> Wang, R-F., and Ateljevich, E., 2012, A continuous surface elevation map for modeling, <em>chapter 6 in</em> 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<br> 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<br>
<br>
Citation
Title San Francisco Bay-Delta bathymetric/topographic digital elevation model (DEM)
other Citation Details
Cinergi keyword enhanced.File generated at Wed Dec 05 04:24:14 UTC 2018
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.