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 constructed and interpreted multibeam bathymetric data within specific areas of special interest. The GeoZui bathymetric data layer presented herein covers roughly 92 square km of the sea floor in the vicinity of Six Mile Reef, eastern Long Island Sound. The original multibeam bathymetric data were collected during 2004 as part of charting applications aboard the NOAA Survey Vessel Thomas Jefferson. A Simrad EM1002 multibeam system mounted on the hull of this vessel was used to acquire data along survey lines from the deeper water (>20 m) parts of the study area. Two 29-foot launches with hull-mounted Reson systems were deployed from the ship and were used to acquire data along survey lines from the shallower areas.
Detailed bathymetric data and their interpretations 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. The bathymetric data models also serve as base maps 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.
National Oceanic and Atmospheric Administration, 2007, H11361_2MGUTM.GUTM: GeoZui File of the 2-m Multibeam Bathymetric Data Collected During National Oceanic and Atmospheric Administration (NOAA) Survey H11361 in Eastern Long Island Sound (UTM, Zone 18): Open-File Report 2007-1191, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.This is part of the following larger work.Online Links:
- <http://pubs.usgs.gov/of/2007/1191/data/h11361/bathy/grids/utm/geozui/h11361_2mgutm.zip>
- <http://pubs.usgs.gov/of/2007/1191/data/h11361/bathy/grids/utm/geozui/h11361_2mgutm.gutm>
- <http://pubs.usgs.gov/of/2007/1191/html/catalog.html>
Poppe, L.J., Denny, J.F., Williams, S.J., Moser, M.S., Forfinski, N.A., Stewart, H.F., and Doran, E.F., 2007, The Geology of Six Mile Reef, Eastern Long Island Sound: Open-File Report 2007-1191, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
Planar coordinates are encoded using row and column
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.
(508) 548-8700 x2314 (voice)
(508) 457-2310 (FAX)
lpoppe@usgs.gov
To release the GeoZui file containing the 2-m bathymetry generated from NOAA survey H11361 in Long Island Sound. A program (GeoZui3D) capable of reading this file can be downloaded free of charge via the World Wides Web (WWW) from Ocean Mapping, Marine GIS of the University of New Hampshire at: <http://www.seascallop.com/GeoZui.html>
.
Person who carried out this activity:
(757) 441-6746 (voice)
marc.s.moser@noaa.gov
Data sources produced in this process:
Poppe, L.J., Williams, S.J., Moser, M.S., Forfinski, N.A., Stewart, H.F., and Doran, E.F., 2007, Quaternary geology and sedimentary processes in the vicinity of Six Mile Reef, eastern Long Island Sound: Journal of Coastal Research v. 23, no. 6,.
Navigation was by differential GPS. Horizontal resolution of the data varies with water depth, but averages 2 m.
Vertical resolution is about 0.5% of the water depth.
All collected data were processed and used to produce this dataset. The area is considered complete; gaps in the data lie in areas inaccessible to the survey vessels (shallow water surrounding islands).
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) as the originator of this information.
(508) 548-8700 x2314 (voice)
(508) 457-2310 (FAX)
lpoppe@usgs.gov
Downloadable Data
Although this data set has been used by the U.S. Geological Survey (USGS), National Oceanic and Atmospheric Administration (NOAA) and Connecticut Department of Environmental Protection (CTDEP), no warranty, expressed or implied, is made by the USGS 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 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.
Data format: | The ASCII data (h11361_2mgutm.gutm), browse graphic, and metadata. in format ASCII |
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Network links: |
<http://pubs.usgs.gov/of/2007/1191/data/h11361/bathy/grids/utm/geozui/h11361_2mgutm.zip> <http://pubs.usgs.gov/of/2007/1191/data/h11361/bathy/grids/utm/geozui/h11361_2mgutm.gutm> <http://pubs.usgs.gov/of/2007/1191/html/catalog.html> |
Media you can order: | DVD-ROM (Density 4.7 Gbytes) (format UDF) |
The user must have a program capable of reading and processing GeoZui files. This program (GeoZui3D) can be downloaded free of charge via the World Wides Web (WWW) from Ocean Mapping, Marine GIS of the University of New Hampshire at: <http://www.seascallop.com/GeoZui.html>
(508) 548-8700 x2314 (voice)
(508) 457-2310 (FAX)
lpoppe@usgs.gov