Tracklines of swath bathymetry collected by the U.S. Geological Survey surrounding Muskeget Channel, MA, 2010 (Esri polyline shapefile, Geographic WGS 84, tracklines_2010_072_FA.shp)

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Frequently anticipated questions:


What does this data set describe?

Title:
Tracklines of swath bathymetry collected by the U.S. Geological Survey surrounding Muskeget Channel, MA, 2010 (Esri polyline shapefile, Geographic WGS 84, tracklines_2010_072_FA.shp)
Abstract:
These data were collected in a collaboration between the Woods Hole Oceanographic Institution and the U.S. Geological Survey (USGS). The primary objective of this program was to collect baseline bathymetry for Muskeget Channel, Massachusetts, and identify areas of morphologic change within and around the channel. Repeat surveys in select areas were collected one month apart to monitor change. These data were collected to support an assessment of the effect on sediment transport that a tidal instream energy conversion facility would have within Muskeget Channel. Accurate data and maps of sea-floor topography are important first steps in monitoring bedform migration, fish habitat, marine resources, and environmental changes due to natural or human impacts. The data include high-resolution bathymetry, acoustic-backscatter intensity, sound velocity in water, and navigation data. These data were collected during two surveys between October 2010 and November 2011 onboard the research vessel (RV) Rafael using an SEA Ltd. SwathPlus interferometric sonar (234 kilohertz). More information about the cruise can be found on the Woods Hole Coastal and Marine Science Center field activity Web page at https://cmgds.marine.usgs.gov/fan_info.php?fan=2010-072-FA.
  1. How might this data set be cited?
    U.S. Geological Survey, 2014, Tracklines of swath bathymetry collected by the U.S. Geological Survey surrounding Muskeget Channel, MA, 2010 (Esri polyline shapefile, Geographic WGS 84, tracklines_2010_072_FA.shp): Open-File Report 2012-1258, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Pendleton, Elizabeth A., Denny, Jane F., Danforth, William W., Baldwin, Wayne E., and Irwin, Barry J., 2014, High-Resolution Swath Interferometric Data Collected within Muskeget Channel, Massachusetts: Open-File Report 2012-1258, U.S. Geological Survey, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -70.498789
    East_Bounding_Coordinate: -70.400722
    North_Bounding_Coordinate: 41.417017
    South_Bounding_Coordinate: 41.293141
  3. What does it look like?
    https://pubs.usgs.gov/of/2012/1258/GIS_catalog/tracklines/track_thumb.png (PNG)
    Woods Hole Coastal and Marine Science Center Swath interferometric trackline navigation surrounding Muskeget Channel, MA
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 12-Oct-2010
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: vector digital data
  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):
      • String (75)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
  7. How does the data set describe geographic features?
    tracklines_2010_072_FA
    Tracklines for swath bathymetric data (Source: U.S. Geological Survey)
    FID
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Shape
    Feature geometry. (Source: ESRI) Coordinates defining the features.
    File
    line and file number for corresponding bathymetric filename. This information is used during data acquisition, storage, and processing. (Source: U.S. Geological Survey) Sequential line and file numbers used to distinguish tracklines
    Day
    The calendar day that the survey data were collected (Source: U.S. Geological Survey)
    Range of values
    Minimum:12
    Maximum:19
    Units:days
    Resolution:1
    Month
    The calendar month that the survey data were collected (Source: U.S. Geological Survey)
    Range of values
    Minimum:10
    Maximum:11
    Units:months
    Resolution:1
    year
    The calendar year that the survey data were collected (Source: U.S. Geological Survey)
    Range of values
    Minimum:2010
    Maximum:2010
    Units:years
    Resolution:1
    length
    length of profile in meters (UTM Zone 19N, WGS84) (Source: U.S. Geological Survey)
    Range of values
    Minimum:632.378
    Maximum:8296.775
    Units:meters
    Resolution:0.0001
    Survey_ID
    WHSC Field Activity number (Source: U.S. Geological Survey) Character dataset defining the year and survey number of a field activity or cruise (xxxx-xxx-FA)
    Vehicle_ID
    Survey vessel name (Source: U.S. Geological Survey) Character string defining the name of the collection vessel

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2259 (voice)
    508-457-2310 (FAX)
    ependleton@usgs.gov

Why was the data set created?

This data set contains tracklines for just less than 227 km of swath bathymetric data collected by the U.S. Geological Survey in Woods Hole, MA during geophysical cruises offshore of Martha's Vineyard, MA in the vicinity of Muskeget Channel in 2010. The swath bathymetric data will be used to characterize the seafloor within the area and these data document those locations.

How was the data set created?

  1. From what previous works were the data drawn?
    USGS (source 1 of 1)
    U.S. Geological Survey, unknown, Information unavailable from original metadata.

    Type_of_Source_Media: disc
    Source_Contribution:
    Trackline acquisition at sea: These bathymetric data were collected with a SEA Ltd Swathplus interferometric sonar (234 kHz) mounted on the bow of the R/V Rafael of Woods Hole, MA. The data were acquired with SwathPlus Software (versions: 3.7.10). Tracklines are spaced 70 m apart.
  2. How were the data generated, processed, and modified?
    Date: 2013 (process 1 of 8)
    Navigation was extracted from the bathymetric data (raw *SXR format) in SwathPlus (version: 3.7.10) using the 'output position file' function. Person who carried out this activity:
    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2259 (voice)
    (508) 457-2310 (FAX)
    ependleton@usgs.gov
    Date: 2013 (process 2 of 8)
    Navigation output from Swathplus (version: 3.7.10) was concatenated together for all files within a survey and converted to comma-separated value text using AWK for input to ArcGIS (version 9.3.1). In ArcCatalog (9.3.1), navigation text was converted to a point feature class by right-clicking on the comma separated text file -- Create Feature Class -- from XY table and choosing UTM, Zone 19N, WGS 84 as the projection Person who carried out this activity:
    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2259 (voice)
    (508) 457-2310 (FAX)
    ependleton@usgs.gov
    Date: 2013 (process 3 of 8)
    XTools Pro (version 7.1.0) was then used within ArcMap (version 9.3.1) to convert the navigation points to a trackline shapefile. The trackline shapefiles were edited to remove spurious fixes, and a length field was created and populated using 'Calculate Geometry', which can be accessed by right-clicking on the attribute field name in the table view. The calculation was based on UTM, Zone 19N, WGS84 in the units of meters. Person who carried out this activity:
    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700 x2259 (voice)
    (508) 457-2310 (FAX)
    ependleton@usgs.gov
    Date: 2013 (process 4 of 8)
    The file was reprojected to GCS WGS 84 using ArcToolBox.
    Date: 2013 (process 5 of 8)
    Additional fields were created for the trackline file in ArcMap (version 9.3.1) by selecting options on the attribute table, then 'Add field'. Survey_ID and VehicleID are used to determine which survey the lines are associated with and which vessel was used to collect the data.
    Date: 06-Oct-2017 (process 6 of 8)
    Edits to the metadata were made to fix any errors that MP v 2.9.36 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). Attempted to modify http to https where appropriate. Added the DOI link in the Identification section - both as the first link and as part of the Larger Work citation. Removed LIDAR bounding coordinates - an artifact of Esri and MP processing. The source information was incomplete and had to be modified to meet the standard. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent. 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: 20-Jul-2018 (process 7 of 8)
    USGS Thesaurus keywords added to the keyword section. 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: 08-Sep-2020 (process 8 of 8)
    Added keywords section with USGS persistent identifier as theme keyword. 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
  3. What similar or related data should the user be aware of?
    Poppe, L.J., McMullen, K.Y., Foster, D.S., Blackwood, D.S., Williams, S.J., Ackerman, S.D., Moser, M.S., and Glomb, K.A., 2010, Geological Interpretation of the Sea Floor Offshore of Edgartown, Massachusetts: Open-File Report 2009-1001, U.S. Geological Survey, Reston, VA.

    Online Links:

    Denny, J.F., Danforth, W.W., Foster, D.S., and Sherwood, C.R., 2009, Geophysical Data Collected off the South Shore of Martha's Vineyard, Massachusetts: Open-File Report 2008-1288, U.S. Geological Survey, Reston, VA.

    Online Links:


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

  1. How well have the observations been checked?
  2. How accurate are the geographic locations?
    The navigation for these data was acquired with a Coda Octopus F180 Differential Global Positioning System + Wide Area Augmentation System (DGPS+WAAS); they are accurate to + or - 1 to 2 meters, horizontally. All DGPS data are referenced to WGS84, and vertical distance between the pole-mounted interferometric sonar head, 0.5m below the sea surface, and the DGPS antenna located on the same pole on the bow of the R/V Rafael, 2.5 m above the sea surface, are corrected.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Swathplus navigation data from all non-transit bathymetric tracklines from cruise 2010-072-FA were used to generate this shapefile.
  5. How consistent are the relationships among the observations, including topology?
    Any spurious navigation points were removed during processing.

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:
The Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the originator of the dataset.
  1. Who distributes the data set? (Distributor 1 of 1)
    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA

    (508) 548-8700x2259 (voice)
    (508) 457-2310 (FAX)
    ependleton@usgs.gov
  2. What's the catalog number I need to order this data set? Downloadable Data
  3. What legal disclaimers am I supposed to read?
    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    This zip file contains data available in Environmental Systems Research Institute (Esri) polyline shapefile format. The user must have ArcGIS or ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView or ArcGIS, the user may utilize another GIS application package capable of importing the data. A free data viewer, ArcExplorer, capable of displaying the data is available from Esri at www.esri.com.

Who wrote the metadata?

Dates:
Last modified: 08-Sep-2020
Metadata author:
Elizabeth Pendleton
U.S. Geological Survey
Geologist
384 Woods Hole Rd.
Woods Hole, MA

(508) 548-8700x2259 (voice)
(508) 457-2310 (FAX)
ependleton@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://cmgds.marine.usgs.gov/catalog/whcmsc/open_file_report/ofr2012-1258/tracklines_2010_072_FA.faq.html>
Generated by mp version 2.9.50 on Tue Sep 21 18:20:39 2021