Digital elevation model (DEM) of central San Francisco Bay, California, created using bathymetry data collected between 2009 and 2020 (MLLW)

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Theresa A. Fregoso
Originator: Bruce E. Jaffe
Originator: Amy C. Foxgrover
Publication_Date: 20210708
Title:
Digital elevation model (DEM) of central San Francisco Bay, California, created using bathymetry data collected between 2009 and 2020 (MLLW)
Geospatial_Data_Presentation_Form: Raster Digital Data Set
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9TJTS8M
Publication_Information:
Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/P9TJTS8M
Online_Linkage: Larger_Work_Citation:
Citation_Information:
Originator: Theresa A. Fregoso
Originator: Bruce E. Jaffe
Originator: Amy C. Foxgrover
Publication_Date: 2020
Title:
High-resolution (1 m) digital elevation model (DEM) of San Francisco Bay, California, created using bathymetry data collected between 1999 and 2020
Edition: 2.0
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P9TJTS8M
Publication_Information:
Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/P9TJTS8M
Description:
Abstract:
A 1-m resolution, continuous surface, bathymetric digital elevation model (DEM) of the central portion of San Francisco Bay, was constructed from bathymetric surveys collected from 2005 to 2020. In 2014 and 2015 the California Ocean Protection Council (OPC) contracted the collection of bathymetric surveys of large portions of San Francisco Bay. A total of 93 surveys were collected using a combination of multibeam and interferometric side-scan sonar systems. Of those 93 surveys, 75 consist of swaths of data ranging from 18- to just over 100-meters wide. These swaths were separated by data gaps ranging from 10- to just over 300-meters wide. The no-data areas required interpolation to create a continuous surface. The OPC surveys were combined with additional datasets collected by the United States Geological Survey (USGS), National Oceanic and Atmospheric Administration (NOAA), NOAA’s National Ocean Service (NOS), and the United States Army Corps of Engineers (USACE) to create a continuous, high-resolution digital elevation model (DEM). The creation of this DEM refines techniques developed by the USGS to create DEMs from historic bathymetric data, and allow for the creation of a modern-day bathymetric surface that can be compared to earlier surveys to delineate regions of sediment erosion and deposition.
Purpose:
These data were compiled using new techniques to create a high-resolution DEM of the central 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.
Supplemental_Information:
Additional information about the USGS field activity from which some of these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=S310SF
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.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 2009
Ending_Date: 2020
Currentness_Reference: ground condition
Status:
Progress: In work
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -122.516735
East_Bounding_Coordinate: -122.235097
North_Bounding_Coordinate: 37.994263
South_Bounding_Coordinate: 37.725137
Keywords:
Theme:
Theme_Keyword_Thesaurus: The National Map Collection Thesaurus
Theme_Keyword: Digital Elevation Model (DEM) 1 meter
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: digital elevation models
Theme_Keyword: bathymetry
Theme_Keyword: topography
Theme_Keyword: geographic information systems
Theme_Keyword: geospatial datasets
Theme_Keyword: single-beam echo sounder
Theme_Keyword: multibeam sonar
Theme_Keyword: GPS measurement
Theme:
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: Bathymetry and Elevation
Theme:
Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords
Theme_Keyword: geographic information systems (GIS)
Theme_Keyword: single-beam echo sounder
Theme_Keyword: multibeam echo sounder
Theme_Keyword: topographic mapping
Theme_Keyword: Global Positioning System (GPS) observations
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
Theme_Keyword: inlandWaters
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:606b73efd34e3d0429b204d3
Place:
Place_Keyword_Thesaurus: Geographic Names Information System (GNIS)
Place_Keyword: San Francisco Bay
Place_Keyword: Golden Gate
Place_Keyword: Pacific Ocean
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.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Person: PCMSC Science Data Coordinator
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: Browse_Graphic_File_Description:
Bathymetric map of the central portion of San Francisco Bay (MLLW).
Browse_Graphic_File_Type: JPEG
Native_Data_Set_Environment:
Microsoft Version 6.2 (Build 9200); Esri ArcGIS 10.8.1.14362(Build 9270) Service Pack N/A (Build N/A)
Cross_Reference:
Citation_Information:
Originator: International Hydrographic Organization (IHO)
Publication_Date: 2008
Title: IHO standards for hydrographic surveys (5th ed.)
Online_Linkage: https://www.iho.int/iho_pubs/standard/S-44_5E.pdf
Cross_Reference:
Citation_Information:
Originator: Environmental Systems Research Institute, Inc (ESRI)
Publication_Date: 2015
Title: Topo to Raster help page
Online_Linkage:
Cross_Reference:
Citation_Information:
Originator: Environmental Systems Research Institute, Inc (ESRI)
Publication_Date: 2020
Title: Pixel Editor in ArcGIS Pro
Online_Linkage:
Cross_Reference:
Citation_Information:
Originator: National Oceanic and Atmospheric Administration (NOAA)
Publication_Date: 2019
Title: Vertical Datum Transformation (VDatum)
Online_Linkage: https://vdatum.noaa.gov/welcome.html
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: No formal attribute accuracy tests were conducted.
Logical_Consistency_Report: No formal logical consistency tests were conducted.
Completeness_Report:
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.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Data is as accurate as source data used. No further tests were conducted, and no claims are made to positional accuracy.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Data is as accurate as source data used. No further tests were conducted, and no claims are made to vertical accuracy.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Theresa A. Fregoso
Publication_Date: 2021
Title:
Footprints and producers of source data used to create central portion of the high-resolution (1 m) San Francisco Bay, California, digital elevation model (DEM)
Geospatial_Data_Presentation_Form: Vector Digital Data Set
Publication_Information:
Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, CA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/P9TJTS8M
Type_of_Source_Media: Digital Resources
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 2009
Ending_Date: 2020
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: Source DEMS
Source_Contribution:
Footprints of bathymetric source DEMS used to create high-resolution San Francisco Bay bathymetric surface.
Process_Step:
Process_Description:
Using ArcGIS, the source DEMs were displayed and areas that would need further interpolation were identified. The lineage, vertical datum, and resolution of each DEM surface were noted for order of precedence when constructing the combined DEM and need for resampling or datum conversions. Using the ArcGIS Mosaic to New Raster tool, the surveys that were from the same sources, and were not continuous surfaces, were assembled into separate DEMs. Elevation contours were digitized across the DEMs to constrain the interpolation across data gaps in intervals of 20 centimeters across broader shallower areas (generally in water depths less than 4 m), and in intervals of 1 meter in deeper areas. The sections were converted from raster to points to use as inputs in the interpolation process. Using the ArcGIS Topo to Raster tool (ESRI 2015), the point data were used, along with the newly drawn contours, to interpolate continuous DEMs at a resolution of 1 meter, using the contours as the primary interpolation constraint. There were areas of multibeam data with varying resolutions, and in a different vertical datum from the rest of the data used in this project. The data were resampled to 1 meter using the resample tool in ArcGIS, and then converted to NAVD88 using NOAA’s VDATUM tool (https://vdatum.noaa.gov/). There were a few areas with data gaps that were filled using the Topo to Raster method from above. Once all data were in the same horizontal (UTM NAD83) and vertical (NAVD88) datums, the different DEMs were fitted together into a seamless DEM using the ArcGIS Mosaic to new Raster tool. In areas with obvious discrepancies between DEMs, edges were smoothed by clipping out a narrow gap between surveys using the pixel editor tool (ESRI 2020) to set the areas to no data, then filling in elevation holes. The final pieces were all put together using the Mosaic to new Raster tool, and VDATUM was again used to create versions in both Mean Lower Low Water (MLLW) and NAVD88. The VDATUM tool did not have the full extents of the MLLW version available for conversion, so the pixel editor tool was used to interpolate based on the edges of the available data.
Source_Used_Citation_Abbreviation: Source DEMS
Process_Date: 20201214
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 29697
Column_Count: 24577
Vertical_Count: 1
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
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_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 1.0
Ordinate_Resolution: 1.0
Planar_Distance_Units: Meter
Geodetic_Model:
Horizontal_Datum_Name: D_NAD_1983_2011
Ellipsoid_Name: GRS_1980
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222101
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: Mean Lower Low Water (MLLW)
Altitude_Resolution: 0.01
Altitude_Distance_Units: meters
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: floating point
Entity_Type_Definition:
GeoTiff with elevation data associated with the digital elevation model (DEM) relative to MLLW. Cells with values of -3.4028231e+38 indicate no data.
Entity_Type_Definition_Source: Producer defined
Attribute:
Attribute_Label: Value
Attribute_Definition: Elevation relative to MLLW
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -110.10692596436
Range_Domain_Maximum: 2.232547044754
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 0.01
Overview_Description:
Entity_and_Attribute_Overview:
DEM in meters using MLLW datum showing bathymetric elevations of the central portion of San Francisco Bay, California.
Entity_and_Attribute_Detail_Citation:
The entity and attribute information were 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.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey - ScienceBase
Contact_Address:
Address_Type: mailing and physical
Address: Denver Federal Center, Building 810, Mail Stop 302
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: US
Contact_Voice_Telephone: 1-888-275-8747
Contact_Electronic_Mail_Address: sciencebase@usgs.gov
Resource_Description:
These data are available as a GeoTiff (CentralSFBay_DEM_Mosaic_MLLW_1m.tif) with accompanying files and FGDC-compliant metadata.
Distribution_Liability:
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.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: geoTIFF
Format_Version_Number: ArcGIS 10.8.1
Format_Information_Content:
Zip file contains a GeoTiff version of the DEM with associated file, a browse graphic, and FGDC-compliant metadata.
File_Decompression_Technique:
Data can be unpacked using WinZip, or other zip decompression software.
Transfer_Size: 964.9
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information: Access_Instructions:
Data can be downloaded using the Network_Resource_Name links. The first link begins a direct download of the DEM data, metadata, and a browse graphic. The second link points to the landing page for information about the MLLW version of the DEM for the central portion of San Francisco Bay. The third link points to the landing page for the entire data release.
Fees: None
Technical_Prerequisites: These data can be viewed with ArcGIS software.
Metadata_Reference_Information:
Metadata_Date: 20210708
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Person: PCMSC Science Data Coordinator
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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