Bathymetry and topography data offshore of Seattle, Washington

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Frequently anticipated questions:

What does this data set describe?

Title: Bathymetry and topography data offshore of Seattle, Washington
Abstract:
This part of USGS Data Series 935 (Cochrane, 2014) presents bathymetry and topography data for the Offshore of Seattle, California, map area, a part of the Southern Salish Sea Habitat Map Series. The data for this map area are a combination of topography extracted from a pre-existing Digital Elevation Model (DEM) merged with bathymetry data that were collected by the National Oceanic and Atmospheric Administration (NOAA) using multibeam sonar systems. The merged data are available for download in a single zip file (BathyTopo_OffshoreSeattle.zip).
Supplemental_Information:
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?
    Ritchie, Andrew C., Moegling, Crescent H., and Cochrane, Guy R., 20220202, Bathymetry and topography data offshore of Seattle, Washington: data release DOI:10.5066/P9GVRZ3M, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    This is part of the following larger work.

    Cochrane, Guy R., 2022, Bathymetry and topography, video observation, and derived benthic habitat data offshore of Seattle, Washington: data release DOI:10.5066/P9GVRZ3M, 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: -122.712694
    East_Bounding_Coordinate: -122.315365
    North_Bounding_Coordinate: 47.834988
    South_Bounding_Coordinate: 47.563374
  3. What does it look like?
    BathyTopo_OffshoreSeattle.jpg (JPEG)
    Shaded-relief map of Offshore of Seattle map area showing bathymetry divided into CMECS depth classes
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 2000
    Ending_Date: 2009
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: GeoTIFF
  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 15000 x 15000 x 1, type Grid Cell
    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: -123.00000
      Latitude_of_Projection_Origin: 0.00000
      False_Easting: 500000.0
      False_Northing: 0.00
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 2.0
      Ordinates (y-coordinates) are specified to the nearest 2.0
      Planar coordinates are specified in Meters
      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Datum_Name: instantaneous sealevel
      Altitude_Resolution: 0.1
      Altitude_Distance_Units: meters
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates
  7. How does the data set describe geographic features?
    value
    Depth as a digital value (Source: Producer defined)
    Entity_and_Attribute_Overview:
    The complete 2-m resolution bathy-topo raster is a GeoTIFF image with the following attributes: 
    Cell size = 2.0
Number of rows = 15000
Number of columns = 15000

Data type = floating point

Boundary
Xmin = 590576
Xmax = 702656
Ymin = 3821624
Ymax = 3973464

Statistics
Minimum value = -298.25
Maximum value = 162.76
Mean = 3.306
Coordinate system description
Projection UTM
Zone 10
Datum NAD 83
Units meter
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Andrew C. Ritchie
    • Crescent H. Moegling
    • Guy R. Cochrane
  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 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 bathymetric features.

How was the data set created?

  1. From what previous works were the data drawn?
    bathy (source 1 of 2)
    National Oceanic and Atmospheric Administration (NOAA)National Center for Environmental Information (NCEI), 2009, Downloadable bathymetry data: National Oceanic and Atmospheric Administration (NOAA), online.

    Online Links:

    Type_of_Source_Media:
    multibeam sonar data downloadable as BAG files from NOAA surveys F00568, H11025, H11605, H11188, H11040, H11039, H11038, H11375, and H12025
    Source_Contribution: bathymetry data
    topo (source 2 of 2)
    Finlayson, D.P., 2005, Combined bathymetry and topography of the Puget Lowland, Washington State: University of Washington, online.

    Online Links:

    Type_of_Source_Media: online digital
    Source_Contribution: elevation data
  2. How were the data generated, processed, and modified?
    Date: 2012 (process 1 of 3)
    Bathymetry data were downloaded from the NOAA National Center for Environmental Information for surveys F00568, H11025, H11605, H11188, H11040, H11039, H11038, H11375, and H12025 in the Offshore of Seattle map area. Users are advised to read the metadata for each source data file fully to understand the parameters for each data collection event. Once all the bathymetric-surface models were transformed to a common projection and datum, the files were combined into one overall 2-m-resolution bathymetric-surface model, merged with onshore elevation data from Finlayson (2005), and clipped to the boundary of the map area. Difference calculations of the overlapping bathymetry grids showed that there is good agreement between surveys, even though the data were collected at different times. Person who carried out this activity:
    Guy R. Cochrane
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Research Geophysicist
    2885 Mission Street
    Santa Cruz, CA
    USA

    (831) 460-7554 (voice)
    gcochrane@usgs.gov
    Data sources used in this process:
    • bathy
    • topo
    Date: 26-Jul-2022 (process 2 of 3)
    Minor edit in metadata to correct keyword. No data were changed. scochran@usgs.gov
    Date: 30-Nov-2022 (process 3 of 3)
    Vertical coordinate system information, inadvertently omitted in the original version of the metadata, was added. No data were changed. (scochran@usgs.gov)
  3. What similar or related data should the user be aware of?
    Cochrane, Guy R., 2014, Southern Salish Sea Habitat Map Series Data Catalog.

    Online Links:

    Other_Citation_Details:
    Cochrane, G.R., compiler, 2014, Southern Salish Sea Habitat Map Series Data Catalog: U.S. Geological Survey Data Series 935

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

  1. How well have the observations been checked?
    Users are advised to read the metadata for each source data file fully to understand the parameters for each data collection event.
  2. How accurate are the geographic locations?
    Estimated to be no less than 2 m, owing to total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations. Users are advised to read the metadata for each source data file fully to understand the parameters for each data collection event.
  3. How accurate are the heights or depths?
    Estimated to be no less than 20 cm, owing to total propagated uncertainties of the mapping systems, which include sonar system, position and motion compensation system, and navigation, as well as data processing that includes sounding cleaning, gridding, and datum transformations. Users are advised to read the metadata for each source data file fully to understand the parameters for each data collection event.
  4. Where are the gaps in the data? What is missing?
    Complete
  5. How consistent are the relationships among the observations, including topology?
    Unspecified

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 and the National Oceanic and Atmospheric Administration 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 - CMGDS
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov
  2. What's the catalog number I need to order this data set? These data are available in GeoTIFF format (.tif and .tfw).
  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?
  5. What hardware or software do I need in order to use the data set?
    These data can be viewed with GIS software or any software capable of opening geotiff files.

Who wrote the metadata?

Dates:
Last modified: 30-Nov-2022
Metadata author:
PCMSC Science Data Coordinator
U.S. Geological Survey, Pacific Coastal and Marine Science Center
2885 Mission Street
Santa Cruz, CA
USA

(831) 427-2727 (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/CMGDS_DR_tool/DR_P9GVRZ3M/BathyTopo_OffshoreSeattle_metadata.faq.html>
Generated by mp version 2.9.51 on Fri Dec 2 09:55:19 2022