H12298_2M_GEO: Esri Binary 2-m Bathymetric Grid of National Oceanic and Atmospheric Administration (NOAA) Survey H12298 in Block Island Sound (Geographic, WGS 84)

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Frequently-anticipated questions:

What does this data set describe?

Title:
H12298_2M_GEO: Esri Binary 2-m Bathymetric Grid of National Oceanic and Atmospheric Administration (NOAA) Survey H12298 in Block Island Sound (Geographic, WGS 84)
Abstract:
The U.S. Geological Survey (USGS), in cooperation with the National Oceanic and Atmospheric Administration (NOAA), is producing detailed geologic maps of the coastal sea floor. Bathymetric and sidescan-sonar data, originally collected by NOAA for charting purposes, provide a framework for research and management activities along western Block Island Sound, show the composition and terrain of the seabed, and provide information on sediment transport and benthic habitat. During June 2013, bottom photographs and surficial sediment data were acquired as part of a ground-truth reconnaissance survey of this area. Interpretations were derived from the multibeam-echosounder, sidescan-sonar, sedimentary, and photographic data collected in Block Island Sound. For more information on the ground-truth survey see <http://woodshole.er.usgs.gov/operations/ia/public_ds_info.php?fa=2013-005-FA>.
  1. How should this data set be cited?

    U.S. Geological Survey, and National Oceanic and Atmospheric Administration, 2015, H12298_2M_GEO: Esri Binary 2-m Bathymetric Grid of National Oceanic and Atmospheric Administration (NOAA) Survey H12298 in Block Island Sound (Geographic, WGS 84): Open-File Report 2014-1224, 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.

    McMullen, K.Y., Poppe, L.J., Danforth, W.W., Blackwood, D.S., Winner, W.G., and Parker, C.E., 2015, Sea-floor morphology and sedimentary environments in western Block Island Sound, offshore of Fishers Island, New York: Open-File Report 2014-1224, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details: DVD-ROM

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -72.006083
    East_Bounding_Coordinate: -71.850621
    North_Bounding_Coordinate: 41.290465
    South_Bounding_Coordinate: 41.189764

  3. What does it look like?

    <https://pubs.usgs.gov/of/2014/1224/data/bathy/grids/geo/h12298_2m_geo.gif> (GIF)
    Thumbnail image showing the 2-m gridded bathymetry collected during NOAA survey H12298 in geographic, WGS 84

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

    Beginning_Date: 31-Aug-2011
    Ending_Date: 16-Nov-2011
    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 4702 x 7259 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 0.000001. 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.

      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 2-m grid of the multibeam bathymetry from NOAA survey H12298 in geographic, WGS 84.

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?

    Katherine McMullen
    U.S. Geological Survey
    Field and Laboratory Technician
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2277 (voice)
    (508) 457-2310 (FAX)
    kmcmullen@usgs.gov

Why was the data set created?

To release a grid of the 2-m bathymetry generated from NOAA survey H12298 in Block Island Sound in geographic, WGS 84.

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, H12298 bathymetry.

    Type_of_Source_Media: disc
    Source_Contribution: Original processed multibeam bathymetric data.

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

    Date: 2011 (process 1 of 4)
    Bathymetric data were acquired in extended Triton data format (XTF) and recorded digitally through an ISIS data acquisition system. A RESON SeaBat 7125 multibeam echosounder, with a frequency of 400 kHz, was used to collect MBES data on the Thomas Jefferson and both survey launches. All positioning and attitude were determined with Trimble DSM212L DGPS receivers and Applanix POS/MV Model 320 v.4 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 three to four hours of multibeam acquisition. Tidal zone corrections were calculated from data acquired at the Newport, Rhode Island, New London, Connecticut, and Montauk, New York tidal gauges and a subordinate gauge at Orient Harbor, NY. The vertical resolution of the multibeam data is approximately 0.5% of the water depth. Vertical datum is mean lower low water; X and Y units are meters; UTM Zone 19, NAD 83.

    Person who carried out this activity:

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

    (301) 683-3227 (voice)
    william.winner@noaa.gov

    Data sources produced in this process:
    • CARIS HIPS database

    Date: 2014 (process 2 of 4)
    The field sheets from the survey (average depths, not the shoal based field sheets) were read back into CARIS HIPS/SIPS software version 8.1 and combined into a single field sheet with a 2-meter cell size using the BASE surface combine tool in CARIS. This process step and all subsequent steps were performed by the same person, William Danforth.

    Person who carried out this activity:

    William Danforth
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    (508) 548-8700 x2274 (voice)
    (508) 457-2310 (FAX)
    bdanforth@usgs.gov

    Data sources used in this process:
    • CARIS HIPS database

    Date: 2014 (process 3 of 4)
    A base surface was then exported from CARIS as an Esri ASCII raster grid. The ASCII raster file was converted to a binary Esri grid using the ASCII to raster tool in ArcGIS v10.0, SP2 (ArcToolbox, Conversion Tools, To Raster, ASCII to Raster), retaining the grid cell size (2 meter node spacing). The projection information (NAD_1983_UTM_Zone_19N) was then written to the binary grid using the Define Projection tool (ArcToolbox, Data Management Tools, Projections and Transformations).

    Person who carried out this activity:

    William Danforth
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    (508) 548-8700 x2274 (voice)
    (508) 457-2310 (FAX)
    bdanforth@usgs.gov

    Date: 2014 (process 4 of 4)
    The UTM projected bathy raster was then reprojected in ArcGIS v10.0, SP2 using the data management tool Project Raster (ArcToolbox, Data Management Tools, Projections and Transformations) from UTM Zone 19N, NAD 83 to Geographic, WGS 84. The options specified in the Project Raster tool were: 1. Input coordinate system: NAD_1983_UTM_Zone_19N 2. Output coordinate system: GCS_WGS_1984 3. Geographic transformation method: NAD_1983_WGS_1984_5 4. Resampling technique: BILINEAR 5. Output cell size: 0.000021416515 (decimal degrees, default as calculated by ArcMap for a 2 meter cell size) The geographic transformation selected is the most accurate one provided by Esri as it ties in WGS 84 with ITRF96, thus reflecting the earth centered offset (x-y-z) between WGS 84 and NAD 83 (from the Esri Knowledge Base Document Number 24159).

    Data sources produced in this process:

    • h12298_2m_geo

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

    Krepp, Lawrence T. , 2011, H12298: Descriptive Report H12298, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    McMullen, K.Y., Poppe, L.J., Haupt, T.A., and Crocker, J.M., 2009, Sidescan-sonar imagery and surficial geologic interpretations of the sea floor in western Rhode Island Sound: Open-File Report 2008-1181, U.S. Geological Survey, Reston, VA.

    Online Links:

    McMullen, K.Y., Poppe, L.J., Denny, J.F., Haupt, T.A., and Crocker, J.M., 2008, Sidescan-sonar imagery and surficial geologic interpretations of the sea floor in central Rhode Island Sound: Open-File Report 2007-1366, U.S. Geological Survey, Reston, VA.

    Online Links:

    Poppe, L.J., Danforth, W.W., McMullen, K.Y., Blankenship, M.A., Glomb, K.A., Wright, D.B., and Smith, S.M., 2014, Sea-floor character and sedimentary processes of Block Island Sound, offshore Rhode Island: Open-File Report 2012-1005, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details: DVD-ROM
    McMullen, K.Y., Poppe, L.J., Ackerman, S.D., Blackwood, D.S., Schaer, J.D., Nadeau, M.A., and Wood, D.A., 2011, Surficial geology of the sea floor in central Rhode Island Sound southeast of Point Judith, Rhode Island: Open-File Report 2011-1005, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details: DVD-ROM
    McMullen, K.Y., Poppe, L.J., Ackerman, S.D., Blackwood, D.S., Lewit, P.G., and Parker, C.E., 2013, Sea-floor geology in northeastern Block Island Sound, Rhode Island: Open-File Report 2013-1003, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details: DVD-ROM
    McMullen, K.Y., Poppe, L.J., Ackerman, S.D., Blackwood, D.S., Glomb, K.A., and Wood, D.A., 2014, Sea-floor geology in northwestern Block Island Sound, Rhode Island: Open-File Report 2014-1018, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details: DVD-ROM
    McMullen, K.Y., Poppe, L.J., Danforth, W.W., Blackwood, D.S., Clos, A.R., and Parker, C.E., 2014, Sea-floor morphology and sedimentary environments of western Block Island Sound, northeast of Gardiners Island, New York: Open-File Report 2014-1160, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details: DVD-ROM

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 using Trimble DSM212L DGPS receivers (accurate to <1m). CARIS HIPS was used to process bathymetry data including correcting for vessel offset.

  3. How accurate are the heights or depths?

    The vertical resolution of the original bathymetry data is approximately 0.5% of the water depth. Depths are corrected for tides. An erroneous point in the UTM grid that wasn't edited out results in the statistics showing a depth of 111.84 meters as the deepest part of the survey. This point was eliminated in the geographic grid when bilinear resampling was used to convert the UTM grid to geographic and the deepest part of this grid is 101.96 meters.

  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 Katherine McMullen
    Field and Laboratory Technician
    384 Woods Hole Road
    Woods Hole, MA 02543-1598
    USA

    (508) 548-8700 x2277 (voice)
    (508) 457-2310 (FAX)
    kmcmullen@usgs.gov

  2. What's the catalog number I need to order this data set?

    Downloadable Data - h12298_2m_geo.zip

  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: 22-Jan-2015
Metadata author:
Katherine McMullen
U.S. Geological Survey
Field and Laboratory Technician
384 Woods Hole Road
Woods Hole, MA 02543-1598
USA

(508) 548-8700 x2277 (voice)
(508) 457-2310 (FAX)
kmcmullen@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 Thu Jan 22 07:11:51 2015