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

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Frequently anticipated questions:

What does this data set describe?

Title:
San Francisco Bay-Delta bathymetric/topographic digital elevation model(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.
Supplemental_Information:
Additional information about the field activities from which these data were derived are available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=S0311CA
  1. How might this data set be cited?
    Fregoso, Theresa A., Wang, Rueen-Fang, Alteljevich, Eli, and Jaffe, Bruce E., 2017, San Francisco Bay-Delta bathymetric/topographic digital elevation model(DEM): data release DOI:10.5066/F7GH9G27, U.S. Geological Survey, Coastal and Marine Geology Program, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.767945
    East_Bounding_Coordinate: -121.198992
    North_Bounding_Coordinate: 38.800412
    South_Bounding_Coordinate: 37.363892
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/58599681e4b01224f329b484?name=SFBayDeltaDEM10m2016.jpg&allowOpen=true (JPEG)
    image map showing 10-m resolution digital elevation model (DEM) of the Sacramento-San Joaquin Delta, color-coded to show elevation
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2016
    Currentness_Reference:
    1933-2012
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Raster Digital Data Set
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Raster data set. It contains the following raster data types:
      • Dimensions 11850 x 9445 x 1, type Grid Cell
    2. What coordinate system is used to represent geographic features?
      The map projection used is Transverse Mercator.
      Projection parameters:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -123.0
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000.0
      False_Northing: 0.0
      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 10.0
      Ordinates (y-coordinates) are specified to the nearest 10.0
      Planar coordinates are specified in METERS
      The horizontal datum used is NAD_1983_UTM_Zone_10N.
      The ellipsoid used is GRS_1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: North American Vertical Datum 1988
      Altitude_Resolution: 1.0
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    ascii file
    Ascii file containing elevation data associated with the digital elevation model (DEM). Cells with values of -9999 in the ascii file indicate no data. (Source: Producer defined)
    Value
    Elevation relative to NAVD88 meters (Source: Producer defined)
    Range of values
    Minimum:-42.720001220703
    Maximum:294.91000366211
    Units:meters

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Theresa A. Fregoso
    • Rueen-Fang Wang
    • Eli Alteljevich
    • Bruce E. Jaffe
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA
    US

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

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.

How was the data set created?

  1. From what previous works were the data drawn?
    American River Comp Study (source 1 of 8)
    United States Army Corps of Engineers, Sacramento District, California, Reclamation Board, 2002, Sacramento and San Joaquin River basins, California, comprehensive study: interim report: U.S. Army Corps of Engineers, Sacramento District: Reclamation Board, State of California, USACE holdings.

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: Topographic/bathymetric used as input for DEM
    2004 Corp Deep Water Ship Channel (source 2 of 8)
    Sea Surveyor, Inc., 20050128, Bathymetry data from the John F. Baldwin and Stockton Deep Water Ship Channels (San Pablo Bay to Stockton) as well as the Sacramento Deep Water Ship Channel (DWSC): U.S. Army Corps of Engineers, San Francisco District, USACE, San Francisco District.

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: Bathymetric data that was used in final DEM
    USGS Sac River Multibeam (source 3 of 8)
    Fregoso, Theresa A., Finlayson, David P., Jaffe, Bruce E., Reiss, Thomas, Smith, David L., and Mulvey, Brian, 2017, Bathymetry and acoustic backscatter data of the Sacramento River, from the Feather River to Knights Landing, California in February, 2011: U.S. Geological Survey - Science Base, Denver, CO.

    Online Links:

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: bathymetry data used in DEM
    USGS 2-m Bathy/Topo (source 4 of 8)
    Tyler, Dean, 20130322, Topo/bathymetric model of San Francisco Bay, California: USGS EROS Data Center, web.

    Online Links:

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: Sections of DEM used to help create this dataset
    Mildred Island (source 5 of 8)
    Lucas, Lisa V., and Burau, Jon R., 20061001, Updated Mildred Island 2001 Depth Sounding Data: U.S. Geological Survey, web.

    Online Links:

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: Bathymetry data used in DEM
    DWR DEM (source 6 of 8)
    Wang, Rueen-Fang, and Ateljevich, Eli, 20120111, San Francisco Bay and Sacramento-San Joaquin Delta DEM: California Department of Water Resources - Bay Delta, web.

    Online Links:

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: Portions of DEM used to create current DEM
    ULEP (source 7 of 8)
    West, Fugro, 2008, Bathymetric Surveys in Support of Urban Levees, Geotechnical Evaluation. Prepared for URS Corporation and California Department of Water Resources, DWR Task Order 32: DWR, DWR holdings.

    Online Links:

    • floodsafe@water.ca.gov

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: Bathymetry data used in DEM
    CVFED Lidar (source 8 of 8)
    DWR CVFED - FloodSafe California, 2014, Central Valley Floodplain Evaluation and Delineation Program: California Department of Water Resources, DWR CVFED Holdings.

    Online Links:

    • floodsafe@water.ca.gov

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: Topographic data used in DEM
  2. How were the data generated, processed, and modified?
    Date: 2015 (process 1 of 11)
    Using the ArcGIS Clip tool, the 2012 DWR DEM was clipped of unneeded areas and areas that were to be replaced. Data sources used in this process:
    • DWR DEM
    Date: 2015 (process 2 of 11)
    Topobathymetric Model of San Francisco Bay, California data were clipped of unneeded areas using ArcGIS clip tool, then resampled to 10 m cell size. Data sources used in this process:
    • USGS 2-m Bathy/Topo
    Date: 2015 (process 3 of 11)
    Integrated the 2004 COE soundings by first digitizing contours from the soundings. Next the soundings and contours were interpolated to raster using the Topo to Raster module in ArcGIS. Data sources used in this process:
    • 2004 Corp Deep Water Ship Channel
    Date: 2016 (process 4 of 11)
    USGS Sac River Multibeam -resampled to 10 meters Data sources used in this process:
    • USGS Sac River Mulitbeam
    Date: 2015 (process 5 of 11)
    Mildred Island: -digitized contours based on soundings -created DEM of Mildred Island using ArcGIS topo to raster of soundings and contours Data sources used in this process:
    • Mildred Island
    Date: 2016 (process 6 of 11)
    ULEP -resampled data to 10-m Data sources used in this process:
    • ULEP
    Date: 2016 (process 7 of 11)
    CVFED Lidar -mosaiced required tiles -removed areas of standing water -resampled to 10-meters Data sources used in this process:
    • CVFED Lidar
    Date: 2016 (process 8 of 11)
    American River Comp Study Data came as tin data set with ~meter resolution converted to Raster grid of 1-meter, then resampled to 10-meter resolution Data sources used in this process:
    • American River Comp Study
    Date: 2016 (process 9 of 11)
    All data sets mosaicked to one DEM using the Mosaic to new Raster tool and blend function for overlapping data. Data sources used in this process:
    • DWR DEM, 2004 Corp Deep Water Ship Channel, American River Comp Study, USGS Sac River Multibeam, USGS 2-m Bathy/Topo, Mildred Island, ULEP, CVFED Lidar
    Date: 19-Oct-2020 (process 10 of 11)
    Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
    Date: 14-Oct-2021 (process 11 of 11)
    Performed minor edits to the metadata to correct typos. No data were changed Person who carried out this activity:
    U.S. Geological Survey
    Attn: Susan A. Cochran
    Geologist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7545 (voice)
    scochran@usgs.gov
  3. What similar or related data should the user be aware of?
    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, Reston, VA.

    Online Links:

    International Hydrographic Organization (IHO), 2008, IHO standards for hydrographic surveys (5th ed.): International Hydrographic Bureau Special Publication 44, 28p., Monaco.

    Online Links:

    Environmental Systems Research Institute, Inc (ESRI), 2015, Topo to Raster help page: ESRI, Redlands, CA.

    Online Links:

    Foxgrover, A., Smith, R.E., and Jaffe, B.E., 2005, Suisun Bay and Delta Bathymetry: U.S. Geological Survey, Coastal and Marine Geology Program, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    Wang, R., 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, Sacramento, CA.

    Online Links:

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    No formal attribute accuracy tests were conducted.
  2. How accurate are the geographic locations?
    Data is as accurate as source data used, no further tests were conducted, and no claims are made to accuracy.
  3. How accurate are the heights or depths?
    Data is as accurate as source data used, no further tests were conducted, and no claims are made to accuracy.
  4. Where are the gaps in the data? What is missing?
    Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    No formal logical accuracy tests were conducted.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None.
Use_Constraints:
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. This information is not intended for navigational purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - Science Base
    U.S. Geological Survey
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO
    USA

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? DEM data are available in a space-delimited ASCII text file (SFBayDeltaDEM10m2016.asc), along with an associated projection file (SFBayDeltaDEM10m2016.prj), browse graphic (SFBayDeltaDEM10m2016.jpg), and FGDC-compliant metadata (SFBayDeltaDEM10m2016.xml)
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 14-Oct-2021
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA
US

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_F7GH9G27/SFBayDeltaDEM10m2016.faq.html>
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