U.S. Geological Survey 2007 1.0 raster digital data Open-File Report 2007-1191 Woods Hole Coastal and Marine Science Center, Woods Hole, MA U.S. Geological Survey, Coastal and Marine Geology Program https://doi.org/10.3133/ofr20071191 http://pubs.usgs.gov/of/2007/1191/data/h11361/bathy/grids/utm/esrigrid/h11361u_2m.zip http://pubs.usgs.gov/of/2007/1191/data/h11361/bathy/grids/utm/esrigrid/ http://pubs.usgs.gov/of/2007/1191/html/catalog.html L.J. Poppe J.F. Denny S.J. Williams M.S. Moser N.A. Forfinski H.F. Stewart E.F. Doran 2007 1.0 Open-File Report 2007-1191 Reston, VA U.S. Geological Survey 1 DVD-ROM http://pubs.usgs.gov/of/2007/1191/ 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 constructed and interpreted multibeam bathymetric data within specific areas of special interest. The bathymetric grid in UTM Zone 18 projection presented herein covers roughly 92 square km of the sea floor in the area around 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. To release a 2-m bathymetric ArcRaster grid generated from NOAA survey H11361 in UTM Zone 18 2004 ground condition Complete None planned -72.542828 -72.396231 41.221784 41.144777 USGS Metadata Identifier USGS:a9887ffb-4500-4651-a5f5-be4fb8de0b43 None U.S. Geological Survey USGS Woods Hole Science Center multibeam bathymetry bathymetry Coastal and Marine Geology Program CMGP WHSC Simrad EM1002 Reson 8125 Reson 8101 NOAA Survey H11361 H11361 National Oceanic and Atmospheric Administration NOAA grid Open-File Report 2007-1191 Universal Transverse Mercator OFR2007-1191 NOAA Project Identifier OPR-B370-TJ Connecticut Department of Environmental Protection CTDEP ArcRaster grid ISO 19115 Topic Category oceans elevation USGS Thesaurus bathymetry sea-floor characteristics multibeam sonar marine geophysics geospatial datasets None Connecticut New York Long Island Sound U.S. East Coast United States North America Atlantic Ocean Six Mile Reef None Public domain data are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) and the Connecticut Department of Environmental Protection (CTDEP) as the originators of this data set. Larry Poppe U.S. Geological Survey Geologist mailing and physical address

384 Woods Hole Road

Woods Hole MA 02543-1598 USA 508-548-8700 x2314 508-457-2310 lpoppe@usgs.gov http://pubs.usgs.gov/of/2007/1191/data/h11361/bathy/grids/utm/esrigrid/h11361u_2m.gif Thumbnail image showing the 2-m bathymetric grid from NOAA survey H11361 in UTM Zone 18. GIF Source data were acquired during National Oceanic and Atmospheric Administration (NOAA) survey H11361. Please acknowledge NOAA as the originator of the dataset from which this dataset was derived. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350 L.J. Poppe S.J. Williams M.S. Moser N.A. Forfinski H.F. Stewart E.F. Doran 2007 1.0 Journal of Coastal Research v. 23, no. 6 Information unavailable from original metadata. All collected data were processed and used to produce this dataset. 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. The source information was incomplete and had to be modified to meet the standard. Assumed to be NOAA. unknown DVD-ROM 2004 ground condition The source information was incomplete and had to be modified to meet the standard. The original multibeam bathymetric data acquired with Simrad EM1002, Reson 8101, and 8125 echosounder systems during NOAA cruise H11361 aboard the NOAA ship 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. The multibeam data were acquired in XTF (extended Triton data format), recorded digitally through an ISIS data acquisition system, and processed using CARIS HIPS (Hydrographic Image Processing System) software for quality control, to incorporate sound velocity and tidal corrections, and to produce base surfaces averaging 2-m resolution over the study area. The raw bathymetric data were exported in ASCII text format in UTM Zone 18. raw bathymetric data unknown h11361_2mutm18_xyz.txt Marc Moser National Oceanic and Atmospheric Administration Field Operations Officer mailing and physical address

439 West York Street

Norfolk VA 23510 USA 757-441-6726 marc.s.moser@noaa.gov The xyz (easting, northing, and depth) data were imported into IVS Avggrid and converted to a DTM (digital terrain model). Data were then exported as an ESRI Grid file using IVS DMagic Export Surface. h11361_2mutm18_xyz.txt 2007 h11361u_2m Jane Denny U.S. Geological Survey GIS Specialist mailing and physical address

384 Woods Hole Road

Woods Hole MA 02543 508-548-8700 x2311 508-457-2310 jdenny@usgs.gov Edits to the metadata were made to fix any errors that MP v 2.9.32 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 source information was incomplete and had to be modified to meet the standard. The original metadata specified the North American Datum of 1983 as the datum name, but that was inconflict with the remaining geodetic model parameters. So the datum name was changed to D_WGS_1984 to be in agreement with the other geodetic model parameters. The distribution format name was modified in an attempt to be more consistent with other metadata files of the same data format. 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. 20160315 U.S. Geological Survey VeeAnn A. Cross Marine Geologist mailing and physical address

384 Woods Hole Rd.

Woods Hole MA 02543 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov USGS Thesaurus keywords added to the keyword section. 20180720 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Crossref DOI link was added as the first link in the metadata. 20191118 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Added keywords section with USGS persistent identifier as theme keyword. 20200908 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Raster Grid Cell 4103 6034 1 Universal Transverse Mercator 18 0.999600 -75.000000 0.000000 500000.000000 0.000000 row and column 2.000000 2.000000 meters D_WGS_1984 WGS_1984 6378137.000000 298.257224 U.S. Geological Survey Larry Poppe Geologist mailing and physical address

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2314 508-457-2310 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 the Connecticut Department of Environmental Protection (CTDEP), no warranty, expressed or implied, is made by the USGS, NOAA, and the Connecticut DEP 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 these agencies 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. AIG Information unavailable from original metadata. ESRI Raster Grid A zip archive containing the bathymetric grid, browse graphic and metadata. zip archive 35 http://pubs.usgs.gov/of/2007/1191/data/h11361/bathy/grids/utm/esrigrid/h11361u_2m.zip http://pubs.usgs.gov/of/2007/1191/data/h11361/bathy/grids/utm/esrigrid/ http://pubs.usgs.gov/of/2007/1191/html/catalog.html Data are downloadable via the World Wide Web (WWW) DVD-ROM 4.75 Gbytes UDF None These data are available in Environmental Systems Research Institute (ESRI) Raster GRID format. The user must have software capable of importing and processing the data files. 2007 20211116 U.S. Geological Survey Larry Poppe Geologist mailing and physical address

384 Woods Hole Road

Woods Hole MA 02543-1598 USA 508-548-8700 x2314 508-457-2310 whsc_data_contact@usgs.gov 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. FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time None None