4-m Grid of the Combined Multibeam and LIDAR Bathymetry Generated from National Oceanic and Atmospheric Administration (NOAA) Surveys H11224, H11225, H11250, H11251, H11252, H11361, H11441, H11442, H11445, H11446, H11997, H11999, H12012, and H12013 Offshore in Eastern Long Island Sound and Westernmost Block Island Sound (ELISCOMB_GEO, Geographic, WGS84)

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Frequently anticipated questions:

What does this data set describe?

Title:
4-m Grid of the Combined Multibeam and LIDAR Bathymetry Generated from National Oceanic and Atmospheric Administration (NOAA) Surveys H11224, H11225, H11250, H11251, H11252, H11361, H11441, H11442, H11445, H11446, H11997, H11999, H12012, and H12013 Offshore in Eastern Long Island Sound and Westernmost Block Island Sound (ELISCOMB_GEO, Geographic, WGS84)
Abstract:
The USGS, in cooperation with NOAA and the Connecticut DEP, is producing detailed maps of the seafloor in Long Island Sound. The current phase of this cooperative research program is directed toward analyzing how bathymetric relief relates to the distribution of sedimentary environments and benthic communities. As part of this program, digital terrain models (DTMs) from bathymetry collected as part of NOAA's hydrographic charting activities are converted into ESRI raster grids and imagery (primarily of 2-m resolution), verified with bottom sampling and photography, and used to produce interpretations of seabed geology and hydrodynamic processes. Although each of the 18 completed surveys, ranging in area from 12 to 293 square kilometers, individually provides important benthic environmental information, many applications require a geographically broader perspective. For example, the usefulness of individual surveys is limited for the planning and construction of cross-Sound infrastructure, such as cables and pipelines, or for the testing of regional circulation models. To address this need, we integrated 12 multibeam and 2 LIDAR (Light Detection and Ranging) contiguous bathymetric DTMs into one dataset that covers much of eastern Long Island Sound. The new dataset is adjusted to mean lower low water, is provided in UTM Zone 18 NAD83 and geographic WGS84 projections, and is gridded to 4-m resolution. This resolution is adequate for seafloor-feature and process interpretation, but small enough to be queried and manipulated with standard GIS programs and to allow for future growth. Natural features visible in the grid include exposed bedrock outcrops, boulder lag deposits of submerged moraines, sand-wave fields, and scour depressions that reflect the strength of the oscillating tidal currents. Bedform asymmetry allows interpretations of net sediment transport. Anthropogenic artifacts visible in the bathymetric data include a dredged channel, shipwrecks, dredge spoils, mooring anchors, prop-scour depressions, buried cables, and bridge footings. Together the merged data reveal a larger, more continuous perspective of bathymetric topography than previously available, providing a fundamental framework for research and resource management activities in this major east-coast estuary.
  1. How might this data set be cited?
    National Oceanic and Atmospheric Administration, and U.S. Geological Survey, 2011, 4-m Grid of the Combined Multibeam and LIDAR Bathymetry Generated from National Oceanic and Atmospheric Administration (NOAA) Surveys H11224, H11225, H11250, H11251, H11252, H11361, H11441, H11442, H11445, H11446, H11997, H11999, H12012, and H12013 Offshore in Eastern Long Island Sound and Westernmost Block Island Sound (ELISCOMB_GEO, Geographic, WGS84): Open-File Report 2011-1003, 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.

    Poppe, L.J., Danforth, W.W., McMullen, K.Y., Parker, C.E., and Doran, E.F., 2011, Combined Multibeam and LIDAR Bathymetry Data from Eastern Long Island Sound and Westernmost Block Island Sound - A Regional Perspective: Open-File Report 2011-1003, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details: 1 DVD-ROM
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -72.666572
    East_Bounding_Coordinate: -71.975086
    North_Bounding_Coordinate: 41.391500
    South_Bounding_Coordinate: 41.079364
  3. What does it look like?
    https://pubs.usgs.gov/of/2011/1003/data/bathy/grids/geo/eliscomb_geo.gif (GIF)
    Browse image of a 4-m grid of the combined bathymetry from NOAA surveys H11224, H11225, H11250, H11251, H11252, H11361, H11441, H11442, H11445, H11446, H11997, H11999, H12012, and H12013 offshore in eastern Long Island Sound and westernmost Block Island Sound in geographic, WGS84 coordinates.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 06-Oct-2003
    Ending_Date: 17-May-2009
    Currentness_Reference:
    ground condition (See the source citation in the lineage section for individual component's specific dates.)
  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 7277 x 16121 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 0.000043. Longitudes are given to the nearest 0.000043. 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 4-m grid of the combined bathymetry data from NOAA surveys H11224, H11225, H11250, H11251, H11252, H11361, H11441, H11442, H11445, H11446, H11997, H11999, H12012, and H12013 offshore in eastern Long Island Sound and westernmost Block Island Sound in geographic, WGS84 coordinates.
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

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

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

Why was the data set created?

To release a 4-m grid of the combined multibeam and LIDAR bathymetry generated from NOAA surveys H11224, H11225, H11250, H11251, H11252, H11361, H11441, H11442, H11445, H11446, H11997, H11999, H12012, and H12013 offshore in eastern Long Island Sound and westernmost Block Island Sound in geographic, WGS84 coordinates.

How was the data set created?

  1. From what previous works were the data drawn?
    H11441 bathymetry (source 1 of 14)
    Christman, Emily B., and Atlantic Hydrographic Branch, National Ocean Survey, National Oceanic and Atmospheric Administration, Norfolk, VA, Unpublished Material, H11441 bathymetry.

    Type_of_Source_Media: computer hard drive
    Source_Contribution: Original processed multibeam bathymetric data.
    H11224 bathymetry (source 2 of 14)
    Atlantic Hydrographic Branch, National Ocean Survey, National Oceanic and Atmospheric Administration, Norfolk, VA, and Stephenson, Darren, Unpublished Material, H11224 bathymetry.

    Type_of_Source_Media: computer hard drive
    Source_Contribution: Original processed LIDAR bathymetric data.
    H11442 bathymetry (source 3 of 14)
    Atlantic Hydrographic Branch, National Ocean Survey, National Oceanic and Atmospheric Administration, Norfolk, VA, and Christman, Emily B., Unpublished Material, H11442 bathymetry.

    Type_of_Source_Media: computer hard drive
    Source_Contribution: Original processed multibeam bathymetric data.
    H11225 bathymetry (source 4 of 14)
    Atlantic Hydrographic Branch, National Ocean Survey, National Oceanic and Atmospheric Administration, Norfolk, VA, and Stephenson, Darren, Unpublished Material, H11225 bathymetry.

    Type_of_Source_Media: computer hard drive
    Source_Contribution: Original processed LIDAR bathymetric data.
    H11250 bathymetry (source 5 of 14)
    Haines, Donald W., and Atlantic Hydrographic Branch, National Ocean Survey, National Oceanic and Atmospheric Administration, Norfolk, VA, Unpublished Material, H11250 bathymetry.

    Type_of_Source_Media: computer hard drive
    Source_Contribution: Original processed multibeam bathymetric data.
    H11251 bathymetry (source 6 of 14)
    Schattgen, P. Tod, and Atlantic Hydrographic Branch, National Ocean Survey, National Oceanic and Atmospheric Administration, Norfolk, VA, Unpublished Material, H11251 bathymetry.

    Type_of_Source_Media: computer hard drive
    Source_Contribution: Original processed multibeam bathymetric data.
    H11252 bathymetry (source 7 of 14)
    Christman, Emily B., and Atlantic Hydrographic Branch, National Ocean Survey, National Oceanic and Atmospheric Administration, Norfolk, VA, Unpublished Material, H11252 bathymetry.

    Type_of_Source_Media: computer hard drive
    Source_Contribution: Original processed multibeam bathymetric data.
    H11361 bathymetry (source 8 of 14)
    Christman, Emily B., and Atlantic Hydrographic Branch, National Ocean Survey, National Oceanic and Atmospheric Administration, Norfolk, VA, Unpublished Material, H11361 bathymetry.

    Type_of_Source_Media: computer hard drive
    Source_Contribution: Original processed multibeam bathymetric data.
    H11445 bathymetry (source 9 of 14)
    Schattgen, P. Tod, and Atlantic Hydrographic Branch, National Ocean Survey, National Oceanic and Atmospheric Administration, Norfolk, VA, Unpublished Material, H11445 bathymetry.

    Type_of_Source_Media: computer hard drive
    Source_Contribution: Original processed multibeam bathymetric data.
    H11446 bathymetry (source 10 of 14)
    Schattgen, P. Tod, and Atlantic Hydrographic Branch, National Ocean Survey, National Oceanic and Atmospheric Administration, Norfolk, VA, Unpublished Material, H11446 bathymetry.

    Type_of_Source_Media: computer hard drive
    Source_Contribution: Original processed multibeam bathymetric data.
    H11997 bathymetry (source 11 of 14)
    Schattgen, P. Tod, and Atlantic Hydrographic Branch, National Ocean Survey, National Oceanic and Atmospheric Administration, Norfolk, VA, Unpublished Material, H11997 bathymetry.

    Type_of_Source_Media: computer hard drive
    Source_Contribution: Original processed multibeam bathymetric data.
    H11999 bathymetry (source 12 of 14)
    Schattgen, P. Tod, and Atlantic Hydrographic Branch, National Ocean Survey, National Oceanic and Atmospheric Administration, Norfolk, VA, Unpublished Material, H11999 bathymetry.

    Type_of_Source_Media: computer hard drive
    Source_Contribution: Original processed multibeam bathymetric data.
    H12012 bathymetry (source 13 of 14)
    Atlantic Hydrographic Branch, National Ocean Survey, National Oceanic and Atmospheric Administration, Norfolk, VA, and Atlantic Hydrographic Branch, National Ocean Survey, National Oceanic and Atmospheric Administration, Norfolk, VA, Unpublished Material, H12012 bathymetry.

    Type_of_Source_Media: computer hard drive
    Source_Contribution: Original processed multibeam bathymetric data.
    H12013 bathymetry (source 14 of 14)
    Schattgen, P. Tod, and Atlantic Hydrographic Branch, National Ocean Survey, National Oceanic and Atmospheric Administration, Norfolk, VA, Unpublished Material, H12013 bathymetry.

    Type_of_Source_Media: computer hard drive
    Source_Contribution: Original processed multibeam bathymetric data.
  2. How were the data generated, processed, and modified?
    Date: Unknown (process 1 of 9)
    The NOAA Ship Thomas Jefferson, and two 8.5-m aluminum Jensen launches deployed from the ship, were used to acquire the multibeam echosounder (MBES) bathymetric data between October 2003 and May 2009 for surveys H11250, H11251, H11252, H11361, H11441, H11442 H11445, H11446, H11997, H11999, H12012, and H12013. Aboard the launches, the MBES data were collected with hull-mounted RESON SeaBat 240-kHz 8101 and 455-kHz 8125 shallow-water systems. These systems measure two-way sound travel time across a 150-degree swath and 120-degree swath, respectively. The SeaBat 8101 has 101 beams at a 1.5-degree beam spacing. The SeaBat 8125 has 240 beams with a cross-track beam width of 0.5 degrees at nadir. Aboard the Thomas Jefferson, MBES data for surveys H11250, H11252, and H11361 were collected with a SIMRAD EM1002 system; later surveys were collected with a RESON 7125 system. Original horizontal resolution of the MBES data was 0.5 to 2 m, depending on survey and water depth; vertical resolution of the MBES data is about 0.5% of the water depth. The bathymetric data were acquired in XTF (extended Triton data format) and processed by NOAA using CARIS HIPS (Hydrographic Image Processing System) software for quality control, to incorporate sound velocity and tidal corrections, and to produce the continuous digital terrain model. Navigation was by TSS POS/MV 320 differential GPS-assisted inertial navigation systems; the differential GPS beacons used were from Moriches, New York, and Sandy Hook, New Jersey. HYPACK MAX was used for acquisition line navigation. 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 MBES acquisition. Tidal zone corrections were calculated from data acquired from National Water Level Observation stations at New London, Connecticut, New Haven, Connecticut, and Montauk, New York. Vertical datum is mean lower low water. Individuals interested in detail descriptions of the MBES acquisition and processing should consult the descriptive reports. Eleven reconnaissance cruises were conducted aboard a leased lobster boat to monitor water clarity prior to commencement of airborne LIDAR operations of surveys H11224 and H11225. These cruises, which utilized Secchi disks to determine water clarity, were conducted between the Connecticut River and Fishers Island during May 9, 2003 and January 11, 2004, when water clarity was deemed adequate. The LIDAR (light detection and ranging) data were acquired by Tenix LADS, Inc. during January 25 - March 3, 2004 with a LADS Mk II system. Airborne survey operations were conducted aboard a Dash 8-202 series aircraft with a Nd:YAG laser at heights between 1,200 and 2,200 feet, at ground speeds between 140 and 210 knots, and at 4x4 and 3x3-m laser-spot spacings. Green laser pulses were scanned beneath the aircraft in a rectilinear pattern. The returned green-laser energy reflected from the sea surface and seafloor were captured and digitally recorded. Received infrared laser energy, supplemented by an Altitude Heading Reference System (AHRS) inertial height reference and kinematic GPS, determined the height of the aircraft. Real-time positioning was provided by WADGPS (wide area differential global positioning system). Acquired data were processed with CARIS HIPS. Individuals interested in detail descriptions of the MBES and LIDAR acquisition and processing should consult the descriptive reports. Vertical datum is mean lower low water; X and Y units are meters; UTM Zone 18, NAD83. Person who carried out this activity:
    National Oceanic and Atmospheric Administration
    Attn: Castle E. Parker
    Hydrographer
    439 West York Street
    Norfolk, VA
    USA

    757-441-6746 (voice)
    castle.e.parker@noaa.gov
    Data sources produced in this process:
    • H11224 CARIS HIPS database
    • H11225 CARIS HIPS database
    • H11250 CARIS HIPS database
    • H11251 CARIS HIPS database
    • H11252 CARIS HIPS database
    • H11361 CARIS HIPS database
    • H11441 CARIS HIPS database
    • H11442 CARIS HIPS database
    • H11445 CARIS HIPS database
    • H11446 CARIS HIPS database
    • H11997 CARIS HIPS database
    • H11999 CARIS HIPS database
    • H12012 CARIS HIPS database
    • H12013 CARIS HIPS database
    Date: 2010 (process 2 of 9)
    The field sheets from the surveys (average depths, not the shoal based field sheets) were read back into CARIS HIPS/SIPS software version 7.0. Using the Base Surface -> Combine command within HIPS, all of the source CARIS base surfaces were combined into a master BASE surface (eliscomb) having a 4 meter grid resolution. Person who carried out this activity:
    Bill Danforth
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2274 (voice)
    508-457-2310 (FAX)
    bdanforth@usgs.gov
    Data sources used in this process:
    • H11224 CARIS HIPS database
    • H11225 CARIS HIPS database
    • H11250 CARIS HIPS database
    • H11251 CARIS HIPS database
    • H11252 CARIS HIPS database
    • H11361 CARIS HIPS database
    • H11441 CARIS HIPS database
    • H11442 CARIS HIPS database
    • H11445 CARIS HIPS database
    • H11446 CARIS HIPS database
    • H11997 CARIS HIPS database
    • H11999 CARIS HIPS database
    • H12012 CARIS HIPS database
    • H12013 CARIS HIPS database
    Data sources produced in this process:
    • eliscomb.csar
    Date: 2010 (process 3 of 9)
    The combined base surface was exported from CARIS as a Bathymetric Attributed Grid (BAG) file. See http://www.opennavsurf.org/papers/ons_fsd.pdf for a description of the BAG format. Person who carried out this activity:
    Bill Danforth
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2274 (voice)
    508-457-2310 (FAX)
    bdanforth@usgs.gov
    Data sources used in this process:
    • eliscomb.csar
    Data sources produced in this process:
    • eliscomb.bag
    Date: 2010 (process 4 of 9)
    The BAG surface was imported into Fledermaus v7.2 to make equivalent digital terrain model (DTM) files. The floating point format for each sounding depth point is preserved during data import. Additionally, the BAG surface was imported into Fledermaus as "gridded data", therefore re-gridding of data did not occur during the import process and thus preserved the original resolution of the CARIS base surface. The dtm was then exported as an ESRI ASCII raster file. Person who carried out this activity:
    Bill Danforth
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2274 (voice)
    508-457-2310 (FAX)
    bdanforth@usgs.gov
    Data sources used in this process:
    • eliscomb.bag
    Data sources produced in this process:
    • eliscomb.asc
    Date: 2010 (process 5 of 9)
    The ESRI ASCII raster file was then converted into raster within ArcToolbox v9.3 using the ASCII to Raster conversion tool, and reprojected using the data management tool Project Raster (ArcToolbox, Data Management Tools, Projections and Transformations) from UTM Zone 18N, NAD 83 to Geographic, WGS84. The options specified in the Project Raster tool were: 1. Input coordinate system: NAD_1983_UTM_Zone_18N 2. Output coordinate system: GCS_WGS_1984 3. Geographic transformation method: NAD_1983_WGS_1984_5 4. Resampling technique: BILINEAR 5. Output cell size: 0.000043 (decimal degrees, default as calculated by ArcMap for a 4 meter cell size) The geographic transformation selected is the most accurate one provided by ESRI as it ties in WGS84 with ITRF96, thus reflecting the earth centered offset (x-y-z) between WGS84 and NAD83 (from the ESRI Knowledge Base Document Number 24159). Person who carried out this activity:
    Bill Danforth
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    507-548-8700 x2274 (voice)
    508-457-2310 (FAX)
    bdanforth@usga.gov
    Data sources used in this process:
    • eliscomb.asc
    Data sources produced in this process:
    • eliscomb_geo
    Date: 16-May-2018 (process 6 of 9)
    Edits to the metadata were made to fix any errors that MP v 2.9.46 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.). The distribution format name was modified in an attempt to be more consistent with other metadata files of the same data format. Reordered the links in the identification section so a landing page link is first. Added the source citation abbreviation and used the title for the value. Attempted to modify http to https where appropriate. 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 9)
    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: 18-Nov-2019 (process 8 of 9)
    Crossref DOI link was added as the first link in the metadata. 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 9 of 9)
    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?
    Christman, Emily B., 2005, H11441: Descriptive Report H11441, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Stephenson, Darren, 2004, H11224: Descriptive Report H11224, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Poppe, L.J., Ackerman, S.D., Doran, E.F., Beaver, A.J., Crocker, J.M., and Schattgen, P.T., 2007, Interpolation of reconnaissance multibeam bathymetry from north-central Long Island Sound: Open-File Report 2005-1145, U.S. Geological Survey, Reston, VA.

    Online Links:

    Christman, Emily B., 2005, H11442: Descriptive Report H11442, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Stephenson, Darren, 2004, H11225: Descriptive Report H11225, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Schattgen, P. Tod, 2008, H11251: Descriptive Report H11251, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Haines, Donald W., 2003, H11250: Descriptive Report H11250, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Christman, Emily B., 2004, H11252: Descriptive Report H11252, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Christman, Emily B., 2004, H11361: Descriptive Report H11361, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Schattgen, P. Tod, 2008, H11445: Descriptive Report H11445, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Schattgen, P. Tod, 2008, H11446: Descriptive Report H11446, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Schattgen, P. Tod, 2008, H11997: Descriptive Report H11997, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Schattgen, P. Tod, 2008, H11999: H11999 Descriptive Report, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Schattgen, P. Tod, 2009, H12012: Descriptive Report H12012, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Schattgen, P. Tod, 2009, H12013: Descriptive Report H12013, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Poppe, L.J., Danforth, W.W., McMullen, K.Y., Parker, C.E., Lewit, P.G., and Doran, E.F., 2010, Integrated multibeam and LIDAR bathymetry data offshore of New London and Niantic, Connecticut: Open-File Report 2009-1231, U.S. Geological Survey, Reston, VA.

    Online Links:

    Other_Citation_Details: 1 CD-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?
    Horizontal position of the launches acquiring multibeam bathymetry were determined using GPS corrected by U.S. Coast Guard differential GPS beacon stations at Moriches, NY, Sandy Hook, NJ, and Acushnet, MA. Real-time positioning during LIDAR acquisition was obtained by an Ashtech GG24 GPS receiver combined with Thales GeoSolutions Wide Area DGPS. Original horizontal resolution of the MBES data was 0.5 - 2 m; original cell size of the gridded LIDAR data was primarily 4 m. The final CARIS combined base surfaces for the MBES data were produced at a 2-m cell size; final cell size of the gridded LIDAR data was 4 m.
  3. How accurate are the heights or depths?
    Attitude of the launches (e.g. pitch, roll, and heave) acquiring multibeam bathymetry were monitored by an Applanix TSS POS/MV 320 Version 3 GPS aided navigation system. Real-time positioning during LIDAR acquisition was obtained by an Ashtech GG24 GPS receiver combined with Thales GeoSolutions Wide Area DGPS. Ashtech Z12 GPS receivers, provided as part of the Airborne System and Ground Systems, also logged GPS data on the aircraft and at a locally established base station to provide post processed KGPS position solutions. Received infrared laser energy, supplemented by an Altitude Heading Reference System (AHRS) inertial height reference and kinematic GPS, determined the height of the aircraft. Verified water levels are based on NWLON stations 8461490, New London, CT and 8465705, New Haven, CT. The vertical resolution of the multibeam 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
    Attn: Larry Poppe
    Geologist
    384 Woods Hole Road
    Woods Hole, MA
    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 the Connecticut Department of Environmental Protection (CT DEP) 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, NOAA, or the CT DEP 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: 16-Nov-2021
Metadata author:
Larry Poppe
U.S. Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA
USA

(508) 548-8700 x2314 (voice)
(508) 457-2310 (FAX)
whsc_data_contact@usgs.gov
Contact_Instructions:
The metadata contact email address is a generic address in the event the metadata contact is no longer with the USGS or the email is otherwise invalid.
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/ofr2011-1003/eliscomb_geo.faq.html>
Generated by mp version 2.9.50 on Tue Nov 16 10:06:44 2021