NLONDON_OUTLINE: Outline of the Combined Multibeam and LIDAR Bathymetry Data Collected During National Oceanic and Atmospheric Administration (NOAA) Surveys H11441 and H11224 (Geographic, WGS84)

Metadata also available as [Outline] - [Parseable text]

Frequently-anticipated questions:

What does this data set describe?

Title:
NLONDON_OUTLINE: Outline of the Combined Multibeam and LIDAR Bathymetry Data Collected During National Oceanic and Atmospheric Administration (NOAA) Surveys H11441 and H11224 (Geographic, WGS84)
Abstract:
Nearshore areas within Long Island Sound are of great interest to the Connecticut and New York research and management communities because of their ecological, recreational, and commercial importance. However, although advances in multibeam echosounder technology permit the construction of detailed digital terrain models of seafloor topography within deeper waters, limitations inherent with collecting multibeam data make using this technology in shallower waters (<10-m deep) more difficult and expensive. These limitations have often resulted in gaps of no data between multibeam bathymetric datasets and the adjacent shoreline. To address this problem, complete-coverage multibeam bathymetry acquired offshore of New London and Niantic Bay, Connecticut, has been integrated with hydrographic LIDAR acquired along the nearshore. The result is a more continuous seafloor perspective and a much smaller gap between the digital bathymetric data and the shoreline. These datasets are provided as ESRI grid and GeoTIFF formats in order to facilitate access, compatibility, and utility.
  1. How should this data set be cited?

    U.S. Geological Survey, 2010, NLONDON_OUTLINE: Outline of the Combined Multibeam and LIDAR Bathymetry Data Collected During National Oceanic and Atmospheric Administration (NOAA) Surveys H11441 and H11224 (Geographic, WGS84): Open-File Report 2009-1231, 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., 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, Coastal and Marine Geology Program, USGS Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    Other_Citation_Details: 1 CD-ROM

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -72.110296
    East_Bounding_Coordinate: -71.991110
    North_Bounding_Coordinate: 41.375289
    South_Bounding_Coordinate: 41.241076

  3. What does it look like?

    <https://pubs.usgs.gov/of/2009/1231/data/basemaps/outlines/nlondon/nlondon_outline.gif> (GIF)
    Thumbnail image showing the outline of combined multibeam and LIDAR data collected during NOAA surveys H11441 and H11224

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

    Calendar_Date: 2010
    Currentness_Reference: publication date

  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):

      • G-polygon (6)

    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_84.
      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?

    nlondon_outline
    Shapefile (Source: None)

    FID
    Internal feature number. (Source: ESRI)

    Whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    ID
    Attribute automatically generated when the graphic was converted to a shapefile. (Source: Software generated)

    Whole numbers that are automatically generated

    Entity_and_Attribute_Overview:
    Outline of the combined multibeam and LIDAR bathymetry from NOAA surveys H11441 and H11224.

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

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

Why was the data set created?

To release an outline of the combined multibeam and LIDAR bathymetry data generated during NOAA surveys H11441 and H11224 in the vicinity of New London, offshore Connecticut, in geographic, WGS84.

How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 2)
    Christman, Emily B. , 2005, H11441: Descriptive Report H11441, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Other_Citation_Details:
    Type_of_Source_Media: DVD-ROM
    Source_Contribution:
    The original multibeam data acquired during NOAA survey H11441 aboard the NOAA ship Thomas Jefferson.

    (source 2 of 2)
    Stephenson, Darren, 2004, H11224: Descriptive Report H11224, National Ocean Survey, National Oceanic and Atmospheric Administration, Atlantic Hydrographic Branch, Norfolk, VA.

    Online Links:

    Other_Citation_Details:
    Type_of_Source_Media: DVD
    Source_Contribution:
    The original LIDAR data acquired during NOAA survey H11224 by Tenix LADS, Inc.

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

    Date: 30-Sep-2009 (process 1 of 2)
    The GeoTIFF image of the combined multibeam and LIDAR bathymetry from NOAA surveys H11441 and H11224 was imported into the ArcView 3.3 GIS project view. These acoustic data were outlined using the available graphic tools then converted to a polygon shapefile using ArcView 3.3.

    Person who carried out this activity:

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

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

    Data sources used in this process:
    • nlondon_mblidar_geo.tif

    Data sources produced in this process:

    • nlondon_outline.shp

    Date: 30-Sep-2009 (process 2 of 2)
    ArcGIS 9.2 was used to define the projection of the ESRI shapefile and to create the .prj file.

    Person who carried out this activity:

    Larry Poppe
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

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

    Data sources used in this process:
    • nlondon_outline.shp

    Data sources produced in this process:

    • nlondon_outline.prj

  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., 2006, Interpolation of reconnaissance multibeam bathymetry from north-central Long Island Sound: Open-File Report 2005-1145, 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?

    Position of the launches 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.

  3. How accurate are the heights or depths?

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

    This data layer shows the extent and locations of the areas surveyed during NOAA surveys H11441 and H11224.

  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:
Public domain data are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the originator of this information.

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

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

    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?

    These data are available in Environmental Systems Research Institute (ESRI) 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 data. A free data viewer, ArcExplorer, capable of displaying the data is available from ESRI at www.esri.com. The user must have software capable of uncompressing archived zip files, such as WinZip or Pkware.

Who wrote the metadata?

Dates:
Last modified: 23-Nov-2009
Metadata author:
U.S. Geological Survey
c/o Larry Poppe
Geologist
384 Woods Hole Road
Woods Hole, MA 02543-1598

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 Tue Nov 24 08:21:15 2009