Color-Encoded Image of 5-m Gridded Hill-Shaded Bathymetry From Long Island Sound off Bridgeport, Connecticut (H11045_UTM18_5MBATHY.TIF, UTM)

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Frequently anticipated questions:

What does this data set describe?

Title:
Color-Encoded Image of 5-m Gridded Hill-Shaded Bathymetry From Long Island Sound off Bridgeport, Connecticut (H11045_UTM18_5MBATHY.TIF, UTM)
Abstract:
The U.S. Geological Survey, in cooperation with the National Oceanic and Atmospheric Administration and the Connecticut Department of Environmental Protection, has produced detailed geologic maps of the sea floor in Long Island Sound, a major East Coast estuary surrounded by the most densely populated region of the United States. These studies have built upon cooperative research with the State of Connecticut that was initiated in 1982. The current phase of this research program is directed toward studies of sea-floor sediment distribution, processes that control sediment distribution, nearshore environmental concerns, and the relation of benthic community structures to the sea-floor geology.
Anthropogenic wastes, toxic chemicals, and changes in land-use patterns resulting from residential, commercial, and recreational development have stressed the environment of the Sound, causing degradation and potential loss of benthic habitats (Koppelman and others, 1976; Long Island Sound Study, 1994). Detailed maps of the sea floor are needed to help evaluate the extent of adverse impacts and to help manage resources wisely in the future. Therefore, in a continuing effort to better understand Long Island Sound, we have regridded and interpolated this NOAA bathymetric survey into a complete-coverage acoustic image of the sea floor. The image presented herein covers an area of the sea floor in west-central Long Island Sound off Bridgeport, Connecticut and was produced from data collected during NOAA survey H11045.
This imagery may serve many purposes, including: (1) defining the geological variability of the sea floor, which is one of the primary controls of benthic habitat diversity; (2) improving our understanding of the processes that control the distribution and transport of bottom sediments and the distribution of benthic habitats and associated infaunal community structures; and (3) providing a detailed framework for future research, monitoring, and management activities. This bathymetry may also serve as a base map for subsequent sedimentological, geochemical, and biological observations, because precise information on environmental setting is important for selection of sampling sites and for accurate interpretation of point measurements.
  1. How might this data set be cited?
    U.S. Geological Survey, 2006, Color-Encoded Image of 5-m Gridded Hill-Shaded Bathymetry From Long Island Sound off Bridgeport, Connecticut (H11045_UTM18_5MBATHY.TIF, UTM): 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:

    This is part of the following larger work.

    Poppe, L.J., Ackerman, S.D., Doran, E.F., Beaver, A.L., 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, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -73.13
    East_Bounding_Coordinate: -72.94
    North_Bounding_Coordinate: 41.14
    South_Bounding_Coordinate: 41.02
  3. What does it look like?
    https://pubs.usgs.gov/of/2005/1145/graphics/browse_graphics/h11045_utm18_5mbathy.jpg (JPEG)
    Overview image of NOAA survey H11045
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2005
    Currentness_Reference:
    publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: remote-sensing image
  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 2933 x 3224 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: 18
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -75.000000
      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 5.000000
      Ordinates (y-coordinates) are specified to the nearest 5.000000
      Planar coordinates are specified in meters
      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      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?

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • U.S. Geological Survey
  2. Who also contributed to the data set?
    Please acknowledge NOAA and the NOAA Ship RUDE as the originators of the data from which this data set was derived.
  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 geotiff image of 5 m gridded bathymetry projected in Universal Transverse Mercator, zone 18N, generated from NOAA survey H11045 in Long Island Sound off Bridgeport, Connecticut.

How was the data set created?

  1. From what previous works were the data drawn?
    h11045_5m_decimal_degrees_xyz.txt (source 1 of 1)
    National Oceanic and Atmospheric Administration, Unpublished Material, H11045 Bathymetry.

    Type_of_Source_Media: DVD-ROM
    Source_Contribution:
    Original gridded, but not interpolated data. This had resulted in areas of no data between many of the ship's tracks.
  2. How were the data generated, processed, and modified?
    Date: 2003 (process 1 of 8)
    The bathymetry data were collected during 2003 as part of NOAA surveys H11044 aboard the NOAA Ship RUDE. The RUDE, which supports NOAA's east-coast nautical charting mission, is outfitted to acquire single-beam bathymetry with an Odom Echotrac DF-3200 duel frequency echosounder and shallow water multibeam bathymetry with a Reson 8125 system. The Reson multibeam system operates at 455 KHz with a 120 degree across track swath and 240 beams along its swath. The multibeam data for these surveys were acquired in XTF (extended Triton data format) and recorded digitally through an ISIS data acquisition system. Once digitally recorded, the XTF data were processed using CARIS HIPS/SIPS software to quality control the data and to incorporate sound velocity and tidal corrections. Vertical datum is mean lower low water. Person who carried out this activity:
    National Oceanic and Atmospheric Administration
    Attn: Crew of the NOAA Ship RUDE
    Atlantic Hydrographic Branch
    Norfolk, VA
    USA

    unknown (voice)
    Data sources produced in this process:
    • h11045_1m_decimal_degrees_xyz.txt
    Date: unknown (process 2 of 8)
    The original multibeam data sets, which are in ASCII comma-delimited text, do not entirely cover the sea floor because line spacing during acquisition was such that areas of no data often are present between the ship's tracks. Therefore, further processing was conducted at the USGS's Woods Hole Science Center to provide bathymetric datasets with more continuous coverage. First, all non-standardized records were assumed to be bad records and were removed. Subsequently, the PROJ.4 cartographic projections library was used to project the data, the SwathEd software produced by the Ocean Mapping Group at the University of New Brunswick was used to create the grids from the actual sounding data, and GMT (the Generic Mapping Tools) was used to create a 5-m interpolated grid of the bathymetry. Interpolation was achieved during GMT processing by running the data through a block median filter and using a surface generating algorithm with a tension of 0.5. Other parameters were set at default. The grid was projected into Universal Transverse Mercator, Zone 18N. Person who carried out this activity:
    Seth Ackerman
    U.S. Geological Survey
    GIS Specialist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2315 (voice)
    Data sources used in this process:
    • h11044_1_5m_decimal_degrees_xyz.txt
    Data sources produced in this process:
    • h11045_bathy5
    Date: 2005 (process 3 of 8)
    A sun-illuminated surface was generated from the interpolated grid using ArcTool box with hill-shading from 270 degrees (a direction parallel to most of the ship's tracks) to minimize artifacts and angle of 45 degrees above the horizon. Person who carried out this activity:
    Seth Ackerman
    U.S. Geological Survey
    GIS Specialist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov
    Data sources used in this process:
    • h11045_bathy5
    Data sources produced in this process:
    • h11045_hlshd5
    Date: 2005 (process 4 of 8)
    ArcView 3.3 extension grid2image (Image Conversion-Georeferencing) was used to create the color geotiff image. As part of this process, the bathymetry was color coded to user-specified full-spectrum legend colors and the hill-shaded grid was saved as a geotiff image preserving both the legend colors and hill shading. Person who carried out this activity:
    Seth Ackerman
    U.S. Geological Survey
    GIS Specialist
    384 Woods Hole Road
    Woods Hole, MA
    USA

    508-548-8700 x2315 (voice)
    508-457-2310 (FAX)
    sackerman@usgs.gov
    Data sources used in this process:
    • h11045_hlshd5
    • h11045_bathy5
    Data sources produced in this process:
    • h11045_utm18_5mbathy.tif
    Date: 10-Feb-2017 (process 5 of 8)
    Edits to the metadata were made to fix any errors that MP v 2.9.36 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.). Attempted to modify http to https where appropriate. The link to the data in the Identification_Information section had to be fixed. Added the online link to the data in the distribution section. Added ISO 19115 Topic Category keywords. Fixed the link to the browse graphic. Moved the quantitative horizontal position information to the horizontal accuracy report. Of note: The datum and ellipsoid names refer to NAD83, but the remaining geodetic model parameters are for a WGS 84 datum. The original metadata does not indicate which one is the correct datum. 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 6 of 8)
    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 7 of 8)
    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: 24-Sep-2021 (process 8 of 8)
    Added keywords section with USGS persistent identifier as theme keyword, 20200908. Added a space to an originator name, 20210924. 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?
    Beaulieu, E., Poppe, L.J., Paskevich, V.F., Doran, E.B., Chauveau, B.E., Crocker, J.M., Beaver, A.J., and Schattgen, P.T., 2005, Sidescan Sonar Imagery and Surficial Geologic Interpretation of the Sea Floor off Bridgeport, Connecticut: Open-File Report 2005-1162, U.S. Geological Survey, Reston, VA.

    Online Links:

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    There are no attributes associated with a geotiff image.
  2. How accurate are the geographic locations?
    Navigation was by Differential GPS. Data was interpolated and gridded to 5 m. The approximate accuracy is 5 m.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    All collected data were processed and used to produce a geotiff of the interpolated and gridded dataset.
  5. How consistent are the relationships among the observations, including topology?
    Information unavailable from original metadata.

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 for navigation purposes.
Public domain data are freely redistributable with proper metadata and source attribution. Please recognize the U.S.Geological Survey (USGS) as the source 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

    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: Geotiff image of color-encoded 5-m hill-shaded multibeam bathymetry of NOAA survey H11045
  3. What legal disclaimers am I supposed to read?
    Although this data set has been used by the USGS and NOAA, no warranty, expressed or implied, is made by the USGS or NOAA as to the accuracy of the data and/or related materials. 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.
  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 and processing "geotiff" images.

Who wrote the metadata?

Dates:
Last modified: 16-Nov-2021
Metadata author:
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)
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/ofr2005-1145/h11045_utm18_5m_txtmdata.faq.html>
Generated by mp version 2.9.50 on Tue Nov 16 10:06:31 2021