Bathymetry--Admiralty Inlet, Washington

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Frequently anticipated questions:

What does this data set describe?

Title: Bathymetry--Admiralty Inlet, Washington
Abstract:
This part of OFR 2015-1073 presents data for the bathymetry and shaded-relief maps (see sheet 1, OFR 2015-1073) of the Admiralty Inlet map area. The raster data file for the bathymetry map is included in "Bathymetry_AdmiraltyInlet.zip." The raster data file for the shaded-relief map is included in "BathymetryHS_AdmiraltyInlet.zip." Both are accessible from <https://pubs.usgs.gov/ds/781/AdmiraltyInlet/data_catalog_AdmiraltyInlet.html>. The bathymetry and shaded-relief maps of the Admiralty Inlet map area in the southern Salish Sea was generated from topography extracted from a Digital Elevation Model (DEM) by Finlayson (2005) and bathymetry data collected more recently by the National Oceanic and Atmospheric Administration (NOAA) (fig. 2-1). Surveys conducted in the Admiralty Inlet map area by the NOAA Ship Rainier include H11188 (NOAA, 2002), H11040 (NOAA, 2002b), H11039 (NOAA 2002c), H11038 (NOAA 2002d) and H11375 (NOAA 2005). Multibeam sonar data were acquired by the Ranier and its survey launches using Reson 8101, Reson 8125, and Elac 1180 multibeam systems.
  1. How should this data set be cited?

    Ritchie, Andrew C., Moegling, Crescent H., and Cochrane, Guy R., 2015, Bathymetry--Admiralty Inlet, Washington:.

    This is part of the following larger work.

    Cochrane, Guy R., Dethier, Megan N., Hodson, Timothy O., Kull, Kristine J., Golden, Nadine E., Ritchie, Andrew C., Moegling, Crescent H., and Pacunski, Robert E., 2014, Southern Salish Sea Habitat Map Series--Admiralty Inlet: Scientific Investigations Map OFR 2015-1073, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -122.959728
    East_Bounding_Coordinate: -122.554836
    North_Bounding_Coordinate: 48.321176
    South_Bounding_Coordinate: 48.050423

  3. What does it look like?

  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, 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

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview: none
    Entity_and_Attribute_Detail_Citation: none

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Guy R. Cochrane
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Physical Scientist
    400 Natural Bridges Dr.
    Santa Cruz, CA 95060-5792
    USA

    (831) 460-7554 (voice)
    (831) 427-4709 (FAX)
    gcochrane@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?

  2. How were the data generated, processed, and modified?

    Date: 2012 (process 1 of 2)
    The horizontal datum for Rainier surveys is the North American Datum of 1983 (NAD83). Differential GPS (DGPS) was the sole method of positioning. Differential corrections from U.S. Coast Guard beacons at Whidbey Island (transmitting on 302 kHz), and Robinson Point (transmitting on 323 kHz) were utilized during surveys. The vertical datum for the Rainier surveys is Mean Lower-Low Water (MLLW). The operating National Water Level Observation Network (NWLON) primary tide station at Port Townsend, AK (944-4900) served as control for datum determination and as the primary source for water level reducers. In addition to Rainier surveys, survey H11801 (NOAA 2009), was conducted using the Kvichak Defender IV for multibeam sonar and sound velocity data collection in waters deeper than 4 meters. Complete multibeam coverage was verified while in the field using a CARIS workstation aboard Kvichak Defender IV, with subsequent verifications performed shore-side on non-survey days. A CODA F-180 motion reference unit was mounted in a water-resistant case to the mid-ships port gunwale immediately adjacent to the Kongsberg EM3002 side-pole mount. The F-180 GPS antennae were mounted in an along-ship orientation with a 2 meter separation between primary and secondary antennae. The R/V Storm was used for gap-fill surveys on the 20-27th January 2009, 3-6 February 2009 and 17-18 February 2009. Storm was configured with a dual-head Reson 7125 MBES and tasked with acquisition of least depths on rocky shoals at the approach to Oak Harbor channel as well as performing gap-fills after conclusion of large boat operations by Kvichak Defender IV. R/V Storm employed Hypack for navigation and raw data acquisition, POS/MV was used for motion and heading and a Sea-Bird CTD for sound speed profiles. Once all the bathymetric-surface models were transformed to a common projection and datum, the files were merged into one overall 2-m-resolution bathymetric-surface model, merged with an onshore DEM 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 surveys were conducted at different times.

    Person who carried out this activity:

    Guy R. Cochrane
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Research Geophysicist
    400 Natural Bridges Dr.
    Santa Cruz, CA 95060-5792
    USA

    (831) 460-7554 (voice)
    gcochrane@usgs.gov

    Date: 2010 (process 2 of 2)
    Merge all bathymetry data into 2-m-resolution bathymetry grid and clip to the Admiralty Inlet map boundary. To create the shaded-relief imagery, an illumination having an azimuth of 315 degrees and 45 degrees above the horizon was applied to the bathymetry grid.

    Person who carried out this activity:

    Guy R. Cochrane
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Geophysicist
    400 Natural Bridges Dr.
    Santa Cruz, CA 95060-5792
    USA

    (831) 460-7554 (voice)
    gcochrane@usgs.gov

  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?

    Not applicable for raster data.

  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.

  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.

  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:
Please recognize the U.S. Geological Survey (USGS); and the National Oceanic and Atmospheric Administration (NOAA). USGS-authored or produced data and information are in the public domain. This information is not intended for navigational purposes. Read and fully comprehend the metadata prior to data use. Uses of these data should not violate the spatial resolution of the data. Where these data are used in combination with other data of different resolution, the resolution of the combined output will be limited by the lowest resolution of all the data. Acknowledge the USGS and NOAA in products derived from these data. Share data products developed using these data with the U.S. Geological Survey. This database has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although this Federal Geographic Data Committee-compliant metadata file is intended to document these data in nonproprietary form, as well as in ArcInfo format, this metadata file may include some ArcInfo-specific terminology.

Who wrote the metadata?

Dates:
Last modified: 10-Jun-2014
Last Reviewed: 10-Jun-2014
Metadata author:
Guy R. Cochrane
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Geophysicist
400 Natural Bridges Dr.
Santa Cruz, CA 95060-5792
USA

(831) 460-7554 (voice)
(831) 427-4709 (FAX)
gcochrane@usgs.gov

Metadata standard:
Content Standard for Digital Geospatial Metadata ("CSDGM version 2") (FGDC-STD-001-1998)

Generated by mp version 2.9.16 on Wed Jun 17 17:07:50 2015