survey1_hs.tif: Swath bathymetry hillshaded-relief image (survey 1) collected by the U.S. Geological Survey surrounding Muskeget Channel, MA, October 2010 (GeoTIFF, UTM Zone 19N, WGS 84, 2-m resolution)

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Frequently anticipated questions:

What does this data set describe?

Title:
survey1_hs.tif: Swath bathymetry hillshaded-relief image (survey 1) collected by the U.S. Geological Survey surrounding Muskeget Channel, MA, October 2010 (GeoTIFF, UTM Zone 19N, WGS 84, 2-m resolution)
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 <http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=2010-072-FA>
  1. How should this data set be cited?

    U.S. Geological Survey, 2014, survey1_hs.tif: Swath bathymetry hillshaded-relief image (survey 1) collected by the U.S. Geological Survey surrounding Muskeget Channel, MA, October 2010 (GeoTIFF, UTM Zone 19N, WGS 84, 2-m resolution): 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: -70.500620
    East_Bounding_Coordinate: -70.399312
    North_Bounding_Coordinate: 41.417459
    South_Bounding_Coordinate: 41.291843

  3. What does it look like?

    http://pubs.usgs.gov/of/2012/1258/GIS_catalog/bathy/S1hs_thumb.png (PNG)
    Woods Hole Coastal and Marine Science Center Swath hillshaded relief 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: raster digital data

  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 6906 x 4123 x 1, type Pixel

    2. What coordinate system is used to represent geographic features?

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 19
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -69.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 2.000000
      Ordinates (y-coordinates) are specified to the nearest 2.000000
      Planar coordinates are specified in meters

      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?

    Entity_and_Attribute_Overview: This is a 16-bit image and the NoData value is -32768.
    survey1_hs.tif.vat

    OID
    Internal feature number. (Source: Esri)

    Sequential unique whole numbers that are automatically generated.

    VALUE

    COUNT

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?

    Elizabeth A. Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

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

Why was the data set created?

This hillshaded-relief image represents approximately 13 square km of bathymetric data that were collected in 2010. These data are used to define the seafloor morphology surrounding the sand shoals and potential cable routes in the vicinity of Muskeget Channel, MA. This grid provides a representation of the seafloor as it was collected in October 2010.

How was the data set created?

  1. From what previous works were the data drawn?

    survey1_2m (source 1 of 1)
    Pendleton, E.A., Denny, J.F., Danforth, W.W., Baldwin, W.E., and Irwin, B.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:

    Type_of_Source_Media: disc
    Source_Contribution:
    The 2 meter bathymetric grid that was created in ArcMap (9.3.1) for Survey 1 in Muskeget Channel was used as input for creating this hillshaded relief image

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

    Date: 2013 (process 1 of 1)
    The 2-m tide corrected Esri grid (survey1_2m) was used to generate a hillshade in ArcMap (version 9.3.1) using spatial analyst -- surface analysis -- hillshade. The Azimuth was 20, the altitude was 45, and the Z factor was 2. The resulting Esri grid was converted to a GeoTIFF by right-clicking in the Table of Contents and selecting Data - Export Data and choosing TIFF as the output. A .tfw (TIFF world file) was created by running the Export Raster World File tool in ArcGIS 9.3.1

    Person who carried out this activity:

    Elizabeth Pendleton
    U.S. Geological Survey
    Geologist
    384 Woods Hole Rd.
    Woods Hole, MA 02543-1598

    (508) 548-8700x2259 (voice)
    (508) 457-2310 (FAX)
    ependleton@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:

    Calder, B.R., 2003, Automatic Statistical Processing of Multibeam Echosounder Data: International Hydrographic Review Volume 4, INT HYDROGRAPHIC BUREAU, The Netherlands.

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 WGS 84, 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?

    Interferometric bathymetry collected during the first survey of 2010-072-FA were used to create this image. Data from the second survey (on 20101119), which reoccupied lines from the first survey, were not included. Data from the second survey are contained in a separate file.

  5. How consistent are the relationships among the observations, including topology?

    Any spurious soundings or 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:
Not to be used for navigation. 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 02543-1598

    (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?

    The image contained in the .zip file is available as GeoTIFF. To utilize this data, the user must have an image viewer, or an image processing or GIS software package capable of importing a TIFF image with a world file

Who wrote the metadata?

Dates:
Last modified: 06-Jan-2014
Metadata author:
Elizabeth Pendleton
U.S. Geological Survey
Geologist
384 Woods Hole Rd.
Woods Hole, MA 02543-1598

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

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.27 on Mon Jun 09 15:06:48 2014