Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2007 Title: SMR_COMP_2MUTM_XYZ.TXT: Composite 2-m ASCII Bathymetric grid from National Oceanic and Atmospheric Administration (NOAA) Surveys H11252 and h11361 of the Sea Floor in Eastern Long Island Sound (UTM Zone18) Edition: 1.0 Series_Information: Series_Name: Open-File Report Issue_Identification: 2007-1191 Publication_Information: Publication_Place: Woods Hole Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2007/1191/data/composite/bathy/grids/utm/asciigrid/smr_comp_2mutm_xyz.zip Online_Linkage: http://pubs.usgs.gov/of/2007/1191/data/composite/bathy/grids/utm/asciigrid/smr_comp_2mutm_xyz.txt Online_Linkage: http://pubs.usgs.gov/of/2007/1191/html/catalog.html Larger_Work_Citation: Citation_Information: Originator: L.J. Poppe Originator: J.F. Denny Originator: S.J. Williams Originator: M.S. Moser Originator: N.A. Forfinski Originator: H.F. Stewart Originator: E.F. Doran Publication_Date: 2007 Title: The Geology of Six Mile Reef, Eastern Long Island Sound Edition: 1.0 Series_Information: Series_Name: Open-File Report Issue_Identification: 2007-1191 Publication_Information: Publication_Place: Woods Hole Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2007/1191/ Description: 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 constructed and interpreted multibeam bathymetric data within specific areas of special interest. This bathymetric data layer presented herein covers a roughly 156 km square area 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 (surveys H11252 and h11361) 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 survey areas. 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. Purpose: To release an ASCII XYZ (Easting, Northing, and Depth) file containing the composite 2-m bathymetry generated from NOAA surveys H11252 and H11361 in Long Island Sound. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2004 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -72.650332 East_Bounding_Coordinate: -72.396231 North_Bounding_Coordinate: 41.221784 South_Bounding_Coordinate: 41.144777 Keywords: Theme: Theme_Keyword_Thesaurus: General Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Woods Hole Science Center Theme_Keyword: multibeam bathymetry Theme_Keyword: bathymetry Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: WHSC Theme_Keyword: Reson 8125 Theme_Keyword: NOAA survey H11252 Theme_Keyword: H11252 Theme_Keyword: National Oceanic and Atmospheric Administration Theme_Keyword: NOAA Theme_Keyword: Reson 8101 Theme_Keyword: Open-File Report 2007-1191 Theme_Keyword: ASCII grid Theme_Keyword: H11361 Theme_Keyword: NOAA survey H11361 Theme_Keyword: composite Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans and estuaries Theme_Keyword: oceans and coastal Theme_Keyword: elevation Place: Place_Keyword_Thesaurus: General Place_Keyword: Connecticut Place_Keyword: New York Place_Keyword: U.S. East Coast Place_Keyword: United States Place_Keyword: North America Place_Keyword: Atlantic Ocean Place_Keyword: Six Mile Reef Place_Keyword: Long Island Sound 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. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Lawrence Poppe Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2314 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: lpoppe@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/of/2007/1191/data/composite/bathy/grids/utm/asciigrid/smr_comp_2mutm_xyz.gif Browse_Graphic_File_Description: Thumbnail image showing the extent of soundings collected during NOAA surveys H11252 and H11361 Browse_Graphic_File_Type: GIF Data_Set_Credit: Source data were acquired during National Oceanic and Atmospheric Administration (NOAA) surveys H11252 and H11361 aboard the survey vessel Thomas Jefferson. Please acknowledge NOAA as the originator of the datasets from which this dataset was derived. Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.780 Cross_Reference: Citation_Information: Originator: L.J. Poppe Originator: S.J. Williams Originator: M.S. Moser Originator: N.A. Forfinski Originator: H.F. Stewart Originator: E.F. Doran Publication_Date: 2007 Title: Quaternary geology and sedimentary processes in the vicinity of Six Mile Reef, eastern Long Island Sound Edition: 1.0 Series_Information: Series_Name: Journal of Coastal Research Issue_Identification: v. 23, no. 6 Data_Quality_Information: Completeness_Report: All collected bathymetric data from NOAA surveys H11252 and H11361 were processed and used to produce this dataset. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Navigation was by differential GPS. Horizontal resolution of the data varies with water depth, but averages 2 m. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Vertical resolution is about 0.5% of the water depth. Lineage: Source_Information: Source_Citation: Citation_Information: Type_of_Source_Media: DVD-ROM Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2004 Source_Currentness_Reference: ground condition Source_Contribution: The original multibeam bathymetric data acquired with Simrad EM1002, Reson 8101, and 8125 echosounder systems during NOAA surveys H11252 and 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. Process_Step: Process_Description: 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 data were exported in text (.txt) format in UTM Zone 18. Source_Used_Citation_Abbreviation: raw bathymetric data Process_Date: Unknown Source_Produced_Citation_Abbreviation: h11252_2mutm18.xyz.txt Source_Produced_Citation_Abbreviation: h11361_2mutm18.xyz.txt Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Marc Moser Contact_Organization: National Oceanic and Atmospheric Administration Contact_Position: Field Operations Officer Contact_Address: Address_Type: mailing address Address: 439 West York Street City: Norfolk State_or_Province: VA Postal_Code: 23510 Country: USA Contact_Voice_Telephone: (757) 441-6746 Contact_Electronic_Mail_Address: marc.s.moser@noaa.gov Process_Step: Process_Description: The xyz (easting, northing, and depth) data were combined using the University of New Brunswick SwathEd weigh_grid command and saved in .txt format. Source_Used_Citation_Abbreviation: h11252_2mutm18.xyz.txt Source_Used_Citation_Abbreviation: h11361_2mutm18.xyz.txt Process_Date: 2007 Source_Produced_Citation_Abbreviation: smr_comp_2mutm_xyz.txt Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jane Denny Contact_Organization: U.S. Geological Survey Contact_Position: GIS Specialist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2311 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: jdenny@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Point Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 18 Transverse_Mercator: Scale_Factor_at_Central_Meridian: .999600 Longitude_of_Central_Meridian: -75.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Coordinate_Representation: Abscissa_Resolution: 2.000359 Ordinate_Resolution: 2.000000 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Depth_System_Definition: Depth_Datum_Name: Mean lower low water Depth_Distance_Units: meters Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Three space separated values per record. Value one is the eastings coordinate in meters of the ship coordinate; value 2 is the northings coordinate in meters the ship's coordinate; value three is the acquired depth value. The depth value is recorded in meters as a positive value. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Larry Poppe Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2314 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: lpoppe@usgs.gov Resource_Description: Downloadable Data Distribution_Liability: Although this data set has been used by the U.S. Geological Survey (USGS, 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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ASCII Format_Information_Content: The ASCII data (smr_comp_2mutm_xyz.txt), browse graphic, and metadata. File_Decompression_Technique: zip archive Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/2007/1191/data/composite/bathy/grids/utm/asciigrid/smr_comp_2mutm_xyz.zip Network_Resource_Name: http://pubs.usgs.gov/of/2007/1191/data/composite/bathy/grids/utm/asciigrid/smr_comp_2mutm_xyz.txt Network_Resource_Name: http://pubs.usgs.gov/of/2007/1191/html/catalog.html Access_Instructions: Data are downloadable via the World Wide Web (WWW). Offline_Option: Offline_Media: DVD-ROM Recording_Capacity: Recording_Density: 4.75 Recording_Density_Units: Gbytes Recording_Format: UDF Fees: None Technical_Prerequisites: The user must have a program capable of reading and processing ASCII formatted XYZ data files. Available_Time_Period: Time_Period_Information: Single_Date/Time: Calendar_Date: 2007 Metadata_Reference_Information: Metadata_Date: 20070817 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Larry Poppe Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2314 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: lpoppe@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Access_Constraints: None Metadata_Use_Constraints: None Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile