H11346_GEO25: 25-m Bathymetric Grid of National Oceanic and Atmospheric Administration (NOAA) Survey H11346 in the Vicinity of Edgartown Harbor, Massachusetts (Geographic, WGS84)

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Frequently-anticipated questions:

What does this data set describe?

Title:
H11346_GEO25: 25-m Bathymetric Grid of National Oceanic and Atmospheric Administration (NOAA) Survey H11346 in the Vicinity of Edgartown Harbor, Massachusetts (Geographic, WGS84)
Abstract:
The U.S. Geological Survey (USGS), in cooperation with the National Oceanic and Atmospheric Administration (NOAA) and the Massachusetts Office of Coastal Zone Management (MA CZM), is producing detailed geologic maps of the coastal sea floor. Imagery, originally collected by NOAA for charting purposes, provides a fundamental framework for research and management activities along this part of the Massachusetts coastline, shows the composition and terrain of the seabed, and provides information on sediment transport and benthic habitat. Interpretive data layers were derived from the combined single-beam and multibeam echo-sounder data and sidescan-sonar data collected in the vicinity of Edgartown Harbor, Massachusetts. During August 2008 seismic-reflection profiles (Boomer and Chirp) were acquired, and during September 2008 bottom photographs and surficial sediment data were acquired as part of two ground-truth reconnaissance surveys.
  1. How should this data set be cited?

    National Oceanic and Atmospheric Administration, and U.S. Geological Survey, 2009, H11346_GEO25: 25-m Bathymetric Grid of National Oceanic and Atmospheric Administration (NOAA) Survey H11346 in the Vicinity of Edgartown Harbor, Massachusetts (Geographic, WGS84): Open-File Report 2009-1001, U.S. Geological Survey, Coastal and Marine Geology Program, USGS Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    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, Coastal and Marine Geology Program, USGS Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -70.551624
    East_Bounding_Coordinate: -70.432188
    North_Bounding_Coordinate: 41.446755
    South_Bounding_Coordinate: 41.384130

  3. What does it look like?

    <https://pubs.usgs.gov/of/2009/1001/data/bathy/grids/geo/h11346_geo25.gif> (GIF)
    Thumbnail image showing the 25-m gridded bathymetry collected during NOAA survey H11346 in Geographic

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 14-Aug-2004
    Ending_Date: 27-Sep-2004
    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 237 x 452 x 1, type Grid Cell

    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 0.000264. Longitudes are given to the nearest 0.000264. 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.

      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Mean lower low water
      Depth_Resolution: 0.1
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    A 25-m grid of the combined single-beam and multibeam bathymetry from NOAA survey H11346 in a geographic coordinate system.

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?

    U.S. Geological Survey
    c/o Larry Poppe
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2314 (voice)
    (508) 457-2310 (FAX)
    lpoppe@usgs.gov

Why was the data set created?

To release a grid of the 25-m bathymetry generated from NOAA survey H11346 in the vicinity of Edgartown Harbor, Massachusetts in a geographic coordinate system.

How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)
    National Ocean Survey, National Oceanic and Atmospheric Adminis, Unpublished Material, H11346 bathymetry.

    Type_of_Source_Media: disc
    Source_Contribution: Original processed single-beam and multibeam bathymetric data.

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

    Date: 2004 (process 1 of 6)
    The bathymetry data were acquired in XTF (extended Triton data format) and recorded digitally through an ISIS data acquisition system. Reson 8101 and 8125 multibeam echosounders and Odom vertical-beam echosounders hull-mounted on 29' launches deployed from the NOAA ship Thomas Jefferson were used to acquire the sounding data. All positioning and attitude were determined with TSS POS/MV 320 DGPS-aided inertial navigation systems. The data were processed using CARIS HIPS (Hydrographic Image Processing System) software for quality control, and to incorporate sound velocity and tidal corrections. Sound velocity corrections were derived using frequent SEACAT CTD (conductivity-temperature-depth) profiles. Typically, a CTD cast was conducted every four to six hours of multibeam acquisition. Tidal zone corrections were calculated from data acquired at the Nantucket tidal gauge and a tertiary gauge at Edgartown, MA. The vertical resolution of the multibeam data is approximately 0.5% of the water depth. The data were gridded to 3-m resolution and saved as a CARIS HIPS database. Because the data are primarily single-beam bathymetry, gaps existed between the tracklines. Vertical datum is mean lower low water; X and Y units are meters; UTM Zone 19, NAD83.

    Person who carried out this activity:

    National Oceanic and Atmospheric Administration
    c/o Marc Moser
    Field Operations Officer
    439 West York Street
    Norfolk, VA 23510
    USA

    757-441-6746 (voice)
    marc.s.moser@noaa.gov

    Data sources produced in this process:
    • CARIS HIPS database

    Date: 2009 (process 2 of 6)
    The CARIS HIPS database was opened in CARIS HIPS/SIPS v6.1 SP2, a 5-m base surface was created in a UTM Zone 19, WGS84 projected CARIS Fieldsheet, and it was exported as ASCII text (xyz) grid.

    Person who carried out this activity:

    Seth Ackerman
    U.S. Geological Survey
    GIS Specialist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov

    Data sources used in this process:
    • CARIS HIPS database

    Data sources produced in this process:

    • ET_5m_ascii.txt

    Date: 2009 (process 3 of 6)
    To fill in the gaps of no data and to produce a continuous-coverage dataset, a 25-m grid was created from the 5-m ASCII soundings using Fledermaus v6.7 AvgGrid, and exported as a Fledermaus digital terrain model with a GEO file.

    Person who carried out this activity:

    Seth Ackerman
    U.S. Geological Survey
    GIS Specialist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov

    Data sources used in this process:
    • ET_5m_ascii.txt

    Data sources produced in this process:

    • ET_25m.dtm
    • ET_25m.geo

    Date: 2009 (process 4 of 6)
    Exported to an ArcView Grid (ASCII format) using Fledermaus v6.7 Data Magician

    Person who carried out this activity:

    Seth Ackerman
    U.S. Geological Survey
    GIS Specialist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov

    Data sources used in this process:
    • ET_25m.dtm
    • ET_25m.geo

    Data sources produced in this process:

    • ET_25m_UTM.asc

    Date: 2009 (process 5 of 6)
    The ArcView Grid was converted to raster using ArcToolbox v9.3, Conversion tools, ASCII to Raster, and then defined projection using ArcCatalog v9.3

    Person who carried out this activity:

    Seth Ackerman
    U.S. Geological Survey
    GIS Specialist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov

    Data sources used in this process:
    • ET_25m_UTM.asc

    Data sources produced in this process:

    • h11346_utm25

    Date: 2009 (process 6 of 6)
    The UTM grid was reprojected into a geographic grid using ArcCatalog v9.3 (Data Management Tools, Projections and Transformations, Raster, Project Raster). The resampling technique was bilinear; other used parameters were defaults.

    Person who carried out this activity:

    Seth Ackerman
    U.S. Geological Survey
    GIS Specialist
    384 Woods Hole Road
    Woods Hole, MA 02453-1598

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov

    Data sources used in this process:
    • h11346_utm25

    Data sources produced in this process:

    • h11346_geo25

  3. What similar or related data should the user be aware of?

    Christman, Emily B. , 2004, H11346: Descriptive Report H11346, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Poppe, L.J., Ackerman, S.D., Foster, D.S., Blackwood, D.S., Butman, B., Moser, M.S., and Stewart, H.F., 2007, Sea-floor character and sedimentary processes of Quicks Hole, Elizabeth Islands, Massachusetts: Open-File Report 2006-1357, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    Poppe, L.J., Ackerman, S.D., Foster, D.S., Blackwood, D.S., Williams, S.J., Moser, M.S., Stewart, H.F., and Glomb, K.A., 2007, Sea-floor character and sedimentary processes of Great Round Shoal Channel, offshore Massachusetts: Open-File Report 2007-1138, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    Poppe, L.J., McMullen, K.Y., Foster, D.S., Blackwood, D.S., Williams, S.J., Ackerman, S.D., Barnum, S.R., and Brennan, R.T., 2008, Sea-floor character and sedimentary processes in the vicinity of Woods Hole, Massachusetts: Open-File Report 2008-1004, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    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?

    Navigation was by differential GPS

  3. How accurate are the heights or depths?

    The vertical resolution of the original bathymetry data is approximately 0.5% of the water depth.

  4. Where are the gaps in the data? What is missing?

    All collected data were processed and used to produce this dataset.

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

    No additional checks for consistency were performed on this data.

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:
Data are not to be used for navigation purposes.
Public domain data are freely redistributable with proper metadata and source attribution. Please recognize the National Oceanic and Atmospheric Administration (NOAA) and U.S. Geological Survey (USGS) as the originators of this information.

  1. Who distributes the data set? (Distributor 1 of 1)

    U.S. Geological Survey
    c/o Larry Poppe
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2314 (voice)
    (508) 457-2310 (FAX)
    lpoppe@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 the National Oceanic and Atmospheric Administration (NOAA), 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 or NOAA 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 user must have a program capable of reading the ESRI grid data format. The user must have software capable of uncompressing archived zip files, such as WinZip or Pkware.

Who wrote the metadata?

Dates:
Last modified: 31-Aug-2009
Metadata author:
Larry Poppe
U.S. Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543-1598
USA

(508) 548-8700 x2314 (voice)
(508) 457-2310 (FAX)
lpoppe@usgs.gov

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

Generated by mp version 2.9.6 on Mon Aug 31 12:56:37 2009