Footprints and producers of source data used to create southern portion of the high-resolution (1 m) San Francisco Bay, California, digital elevation model (DEM)

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:

What does this data set describe?

Title:
Footprints and producers of source data used to create southern portion of the high-resolution (1 m) San Francisco Bay, California, digital elevation model (DEM)
Abstract:
Polygon shapefile showing the footprint boundaries, source agency origins, and resolutions of compiled bathymetric digital elevation models (DEMs) used to construct a continuous, high-resolution DEM of the southern portion of San Francisco Bay.
Supplemental_Information:
Additional information about the USGS field activities from which some of these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=b105SF https://cmgds.marine.usgs.gov/fan_info.php?fan=S0111SF https://cmgds.marine.usgs.gov/fan_info.php?fan=2016-678-FA https://cmgds.marine.usgs.gov/fan_info.php?fan=2019-614-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.
  1. How might this data set be cited?
    Fregoso, Theresa A., 20210708, Footprints and producers of source data used to create southern portion of the high-resolution (1 m) San Francisco Bay, California, digital elevation model (DEM): data release DOI:10.5066/P9TJTS8M, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    This is part of the following larger work.

    Fregoso, Theresa A., Jaffe, Bruce E., and Foxgrover, Amy C., 2020, High-resolution (1 m) digital elevation model (DEM) of San Francisco Bay, California, created using bathymetry data collected between 1999 and 2020: data release DOI:10.5066/P9TJTS8M, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -122.392772
    East_Bounding_Coordinate: -121.971117
    North_Bounding_Coordinate: 37.729729
    South_Bounding_Coordinate: 37.416952
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/607df1b6d34e8564d67e3af6?name=SouthSFBay_DEM_DataSources.jpg&allowOpen=true (JPEG)
    Map showing footprints and sources of bathymetric digital elevation models (DEMs) from the southern portion of San Francisco Bay compiled to create the high-resolution (1 m) DEM.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 2005
    Ending_Date: 2020
    Currentness_Reference:
    publication date of source DEMs
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polygon)
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • G-polygon (34)
    2. What coordinate system is used to represent geographic features?
      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 10
      Transverse_Mercator:
      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 coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.6096
      Ordinates (y-coordinates) are specified to the nearest 0.6096
      Planar coordinates are specified in Meter
      The horizontal datum used is D_NAD_1983_2011.
      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.
  7. How does the data set describe geographic features?
    Attribute Table
    Table containing attribute information associated with the data set. (Source: Producer defined)
    Region
    Area of DEM in relation to San Francisco Bay (Source: Producer defined)
    ValueDefinition
    SouthSouth San Francisco Bay
    Survey
    survey identifier (Source: Producer defined) Unique survey name generated by collecting agency.
    agency
    Agency/party responsible for collecting source data. NA=not applicable (Source: Producer defined)
    ValueDefinition
    NOAA/CSUMBNational Oceanic and Atmospheric Administration and California State University Monterey Bay
    NOAA/FugroNational Oceanic and Atmospheric Administration and Fugro
    NOSNOAA National Ocean Service
    USACEU.S. Army Corps of Engineers
    USGSU.S. Geological Survey
    yes
    Year source survey conducted. NA=not applicable (Source: Producer defined)
    Range of values
    Minimum:2005
    Maximum:2020
    Units:years
    resolution
    DEM resolution of source survey (Source: Producer defined)
    ValueDefinition
    1 mResolution of source DEM in meters
    25 mResolution of source DEM in meters
    1-2 mResolution of source DEM in meters
    undefinedResolution of source survey is undefined
    datum
    Vertical Datum of source DEM (Source: Producer defined)
    ValueDefinition
    MLLWMean Lower Low Water
    NAVD88North American Vertical Datum 1988
    NAVD88/MLLWNorth American Vertical Datum 1988 and Mean Lower Low Water
    sensor_typ
    type of sensor used to collect bathymetric data for source DEM. NA=not applicable (Source: Producer defined)
    ValueDefinition
    interferometrictype of sensor used to collect bathymetric data for source DEM
    multibeamtype of sensor used to collect bathymetric data for source DEM
    single beamtype of sensor used to collect bathymetric data for source DEM
    interp_req
    Indicates if interpolation was required for any data gaps in source DEM (Source: Producer defined)
    ValueDefinition
    YesInterpolation performed
    NoNo interpolation performed
    location
    location of data and/or metadata for source DEM (Source: Producer defined) Website to find data and/or metadata for each source DEM
    Entity_and_Attribute_Overview:
    The entity and attribute information provided here describes the tabular data associated with the dataset. Please review the detailed descriptions that are provided (the individual attribute descriptions) for information on the values that appear as fields/table entries of the dataset.
    Entity_and_Attribute_Detail_Citation:
    The entity and attribute information was generated by the individual and/or agency identified as the originator of the data set. Please review the rest of the metadata record for additional details and information.

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
  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

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

Why was the data set created?

These data were compiled using new techniques to create a high-resolution DEM of the southern portion of San Francisco Bay, which will be used to document and assess changes in seafloor morphology. These data are intended for science researchers, students, policy makers, and the general public. These data can be used with geographic information systems (GIS) 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?
    OPC interferometric (source 1 of 11)
    NOAA Office of Coastal Management, 2019, 2014 San Francisco Bay (CA) Side Scan Sonar Bathymetry-Area A: NOAA Office of Coastal Management, online.

    Online Links:

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: provided bathymetric DEM geographical area
    OPC Multi-beam (source 2 of 11)
    NOAA Office of Coastal Manage, 2019, 2014 San Francisco Bay (CA) Multi-Beam Bathymetry-Area A: NOAA Office of Coastal Management, online.

    Online Links:

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: provided bathymetric DEM geographical area
    OPC interferometric B (source 3 of 11)
    NOAA Office of Coastal Management, 2016, 2014 San Francisco Bay (CA) Side Scan Sonar Bathymetry-Area B: NOAA Office of Coastal Management, online.

    Online Links:

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: provided bathymetric DEM geographical area
    H12226 (source 4 of 11)
    Hydrographic Surveys Division, Office of Coast Survey, National Ocean Service, NOAA, U.S. Department of Commerce, 2013, H12226: NOS Hydrographic Survey, 2014-12-04: NOAA Office of Coastal Management, online.

    Online Links:

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: provided bathymetric DEM geographical area
    SF02_RCH (source 5 of 11)
    San Francisco District Corps of Engineers, 2020, SF_02_RCH_20201208_CS: San Francisco District Corps of Engineers, online.

    Online Links:

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: provided bathymetric DEM geographical area
    SF03_SBS (source 6 of 11)
    San Francisco District Corps of Engineers, 2014, SF_03_SBS_20140415_CON: San Francisco District Corps of Engineers, online.

    Online Links:

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: provided bathymetric DEM geographical area
    SF32_SLC1 (source 7 of 11)
    San Francisco District Corps of Engineers, 2010, SF_32_SLC_20100315_CS: San Francisco District Corps of Engineers, online.

    Online Links:

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: provided bathymetric DEM geographical area
    SF32_SLC2 (source 8 of 11)
    San Francisco District Corps of Engineers, 2015, SF_32_SLC_20150330_20150401_CON_SORTED15: San Francisco District Corps of Engineers, online.

    Online Links:

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: provided bathymetric DEM geographical area
    SSFB05 (source 9 of 11)
    United States Geological Survey, 2007, 2005 single beam bathymetry data collected in South San Francisco Bay, California: United States Geological Survey, online.

    Online Links:

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: provided bathymetric DEM geographical area
    AV_Oct2016 and AV_Apr2019 (source 10 of 11)
    United States Geological Survey, 2020, Bathymetry and digital elevation models of Coyote Creek and Alviso Slough, South San Francisco Bay, California: United States Geological Survey, online.

    Online Links:

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: provided bathymetric DEM geographical area
    DB2010 (source 11 of 11)
    United States Geological Survey, 2021, field activity S0111SF: United States Geological Survey, online.

    Online Links:

    Type_of_Source_Media: Digital and/or Hardcopy Resources
    Source_Contribution: provided bathymetric DEM geographical area
  2. How were the data generated, processed, and modified?
    Date: 2021 (process 1 of 3)
    Digital footprints of source DEMs obtained by reclassifying original raster DEMs to single value using the ArcGIS reclassify tool. Data sources used in this process:
    • OPC Interferometric, OPC Interferometric B, OPC Multi-beam, H12226, SF32_SLC1, SF32_SLC2, SF03_SBS, SF02_RCH, SSFB05, DB2010, AV_Oct2016 and AV_Apr2019
    Date: 2021 (process 2 of 3)
    Reclassified DEMs converted to polygon shapefiles and merged into one shapefile. Data sources used in this process:
    • OPC Interferometric, OPC Interferometric B, OPC Multi-beam, H12226, SF32_SLC1, SF32_SLC2, SF03_SBS, SF02_RCH, SSFB05, DB2010, AV_Oct2016 and AV_Apr2019
    Date: 2021 (process 3 of 3)
    DEM sources information entered into shapefile feature attribute table. Data sources used in this process:
    • OPC Interferometric, OPC Interferometric B, OPC Multi-beam, H12226, SF32_SLC1, SF32_SLC2, SF03_SBS, SF02_RCH, SSFB05, DB2010, AV_Oct2016 and AV_Apr2019
  3. What similar or related data should the user be aware of?

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 are as accurate as source data used. No further tests were conducted, and no claims are made to positional accuracy.
  3. How accurate are the heights or depths?
    Data are as accurate as source data used. No further tests were conducted, and no claims are made to positional 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 navigation purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? These data are available as a shapefile (SouthSFBay_DEM_DataSources.shp) that provides footprint boundaries and descriptions of the source DEMs that were compiled to create the accompanying high-resolution (1 m) DEM.
  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: 08-Jul-2021
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA

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_P9TJTS8M/SouthSFBay_DEM_DataSources_metadata.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:17:34 2021