Dataset Identification:
Resource Abstract:
- description: 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. 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).
All data were converted to NGVD29. The 2005 USGS DEM was updated by DWR, first by converting the DEM to the current modern
datum of National Geodetic Vertical Datum of 1988 (NGVD88) 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.; 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. 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).
All data were converted to NGVD29. The 2005 USGS DEM was updated by DWR, first by converting the DEM to the current modern
datum of National Geodetic Vertical Datum of 1988 (NGVD88) 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.
Citation
- Title San Francisco Bay-Delta bathymetric/topographic digital elevation model(DEM).
-
- creation Date
2018-05-12T16:55:28.063394
Resource language:
Processing environment:
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Metadata data stamp:
2018-08-06T22:37:12Z
Resource Maintenance Information
- maintenance or update frequency:
- notes: This metadata record was generated by an xslt transformation from a dc metadata record; Transform by Stephen M. Richard, based
on a transform by Damian Ulbricht. Run on 2018-08-06T22:37:12Z
Metadata contact
-
pointOfContact
- organisation Name
CINERGI Metadata catalog
-
- Contact information
-
-
- Address
-
- electronic Mail Address cinergi@sdsc.edu
Metadata language
eng
Metadata character set encoding:
utf8
Metadata standard for this record:
ISO 19139 Geographic Information - Metadata - Implementation Specification
standard version:
2007
Metadata record identifier:
urn:dciso:metadataabout:fe3878aa-3360-4cf6-8ca8-1769ddfd613d
Metadata record format is ISO19139 XML (MD_Metadata)