Identification_Information: Citation: Citation_Information: Originator: Jane F. Denny Publication_Date: 2000 Title: USGS ASCII trackline bathymetry Geospatial_Data_Presentation_Form: Raster Grid Publication_Information: Publication_Place: Woods Hole, MA Publisher: U.S. Geological Survey Online_Linkage: http:/woodshole.er.usgs.gov/project-pages/newyork Larger_Work_Citation: Citation_Information: Originator: Schwab, William C. Originator: Denny, Jane F. Originator: Foster, David S. Originator: Lotto, Linda L. Originator: Allison, Mead A. Originator: Uchupi, Elazar Originator: Swift, B. Ann Originator: Danforth, William W. Originator: Thieler, Robert E. Originator: Butman, Bradford Publication_Date: 2002 Title: High-Resolution Quaternary seismic stratigraphy of the New York Bight Continental Shelf Geospatial_Data_Presentation_Form: Maps, remote sensing imagery, tabular digital data, and raster and vector digital data Series_Information: Series_Name: Open-File Report Issue_Identification: OFR02-152 Publication_Information: Publication_Place: Woods Hole, MA Publisher: U.S. Geological Survey Online_Linkage: http://woodshole.er.usgs.gov/project-pages/newyork Description: Abstract: These data represent single beam echo sounder (trackline) bathymetry collected in May 1995, May 1996, September 1996, May 1997, and October 1998 during five USGS cruises within the New York Bight region. Trackline spacing during these cruises was 300 meters. These data have been corrected for tidal fluctuations and distance of the transducer below the water line. All values are stored in meters. These data are referenced to Mean Lower Low Water. Purpose: Beginning in 1995, the USGS, in cooperation with the U.S Army Corps of Engineers (USACE), New York District, began a program to generate reconnaissance maps of the sea floor offshore of the New York-New Jersey metropolitan area, one of the most populated coastal regions of the United States. The goal of this mapping program is to provide a regional synthesis of the sea-floor environment, including a description of sedimentary environments, sediment texture, seafloor morphology, and geologic history to aid in understanding the impacts of anthropogenic activities, such as ocean dumping. This mapping effort differs from previous studies of this area by obtaining digital, sidescan-sonar images that cover 100 percent of the sea floor. This investigation was motivated by the need to develop an environmentally acceptable solution for the disposal of dredged material from the New York- New Jersey Port, by the need to identify potential sources of sand for nourishment of the southern shore of Long island, and by the opportunity to develop a better understanding of the transport and long-term fate of contaminants by investigations of the present distribution of materials discharged into the New York Bight over the last 100+ years (Schwab and others, 1997). Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 19950501 Ending_Date: 19981101 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -74.13288 East_Bounding_Coordinate: -71.71902 North_Bounding_Coordinate: 41.15827 South_Bounding_Coordinate: 40.08264 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Bathymetry Theme_Keyword: single-beam Theme_Keyword: echosounder Theme_Keyword: fathometer Theme_Keyword: USGS Theme_Keyword: Woods Hole Field Center Place: Place_Keyword_Thesaurus: None Place_Keyword: Atlantic Ocean Place_Keyword: Southern Long Island Place_Keyword: New York Inner Shelf Place_Keyword: New York Bight Place_Keyword: NY Access_Constraints: none Use_Constraints: Bathymetric data are not to be used for navigation purposes, and have not been acquired to International Hydrographic (IHO) Standards. Please recognize the USGS as the source of these data. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jane F. Denny Contact_Organization: US 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 Country: USA Contact_Voice_Telephone: 508-457-2311 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: jdenny@usgs.gov Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: These data are internally consistent and have been compared to multibeam and single-beam bathymetric surveys to check for accuracy. Any differences between this bathymetric data set and others were determined to be within acceptable error given the inherent differences in the various bathymetric data sets (i.e. acquisition system, mode of navigation, density of point, and or swath bathymetry). Logical_Consistency_Report: These data are were checked for consistency by plotting the point data with the contoured surface and eliminating suprious and anomolous soundings. Completeness_Report: Complete Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: DGPS is assumed to be accurate within 1-2 meters. Standard GPS is assumed accurate within 5-10 meters. 99% of the positional data is DGPS. Unless noted, all GPS/DGPS data is referenced to WGS84 (NAD83). The configuration of the fathometer is as follows: The fathometer is mounted on either the port or starboard side of the vessel. Offset between the sidemount and GPS antennae is measured. No measurements were taken of ship's pitch, yaw, heave, or change in draft due to water and fuel usage. Motion of the fathometer is not measured. Horizontal accuarcy of the fathometer is assumed to be within +/- 3 meters. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: A one meter offset was measured from the water line to the tranducer. This offset was added to the bathymetric measurements. Tidal fluctuations have also been accounted for within these data. No motion sensor monitors the movement of the fathometer or vessel (pitch, heave, yaw). As such, the working vertical accuracy of these data is +/- 0.5 - 1 meter. These data are referenced to Mean Lower Low Water. Lineage: Process_Step: Process_Description: Bathymetric data were extracted from the survey navigation and stored as an ASCII file, listing longitude, latitude, and depth in meters. These data were then reformatted and loaded into MATLAB (MathWorks, Inc.). The trackline spacing during data acquisition was 300 meters. Process_Date: 2000 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jane Denny Contact_Organization: U. S. Geological Survey Contact_Position: Seafloor Mapping Group Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd City: Woods Hole State_or_Province: MA Postal_Code: 02543 Country: USA Contact_Voice_Telephone: 508-457-2311 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: jdenny@usgs.gov Process_Step: Process_Description: Within MATLAB (MathWorks, Inc), a median filter with a 15 pixel boxcar size was applied to the bathymetric data to remove spurious spikes and anomolous readings. In order to account for the distance of the transducer below the sea surface, one meter was added to the bathymetric values. These data were then corrected for tidal fluctuations. The ADCIRC circulation model was used to extract tidal coefficients at the locations along the cruise track. A low-pass filter was applied to the Sandy Hook, NJ and Montauk Point, NY tidal stations to determine the wind compenent to the tides within the New York Bight region. A weighted distance interpolation was used between the two tidal stations in order to determine the tidal wind component along the cruise track. Final bathymetric values were determined by subtracting the wind component and tidal offset from the original bathymetric measurement. These values were then exported from Matlab and reformatted to load into EarthVision (Dynamic Graphics, Inc.) Source_Used_Citation_Abbreviation: http://www.marine.unc.edu/C_CATS/adcirc/adcirc.htm Process_Date: 2000 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jane F. Denny Contact_Organization: US 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 Country: USA Contact_Voice_Telephone: 508-457-2311 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: jdenny@usgs.gov Process_Step: Process_Description: The tidally corrected bathymetric soundings were loaded into EarthVision (Dynamic Graphics, Inc.). These point data were gridded at a 300 meter grid cell size, yielding a grid size of 214 rows x 488 columns. (The 300 meter grid cell size was chosen based on the trackline spacing during data acquisition (300m)).The point data were further editted to remove anomolous points by contouring the bathymetric grid, and using the contour and grid information to locate anomolous soundings. The grid was exported from EarthVision as an ASCII Raster file and edited to create a file suitable for import to ArcView software. The order of rows were flipped, so that the file begins with the lower row, left column and ends with the upper row right column. An ArcView header that descibes the lower left origin of the grid, the grid cell size, the number of rows and columns, and the null value used (-9999). Contour data were also exported from within EarthVision, and reformatted for import into ArcView software as an ESRI generate file. Process_Date: 2000 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jane F. Denny Contact_Organization: US 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 Country: USA Contact_Voice_Telephone: 508-457-2311 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: jdenny@usgs.gov Process_Step: Process_Description: The original bathymetric grid extended beyond the bounds of the 1995 and 1996 study areas; the data covered offshore areas from New York - New Jersey to southern shore of Long Isand. A GRIDCLIP script was used in ArcView 3.2 to clip the original bathymetric grid to the bounds of the 1995 and 1996 surveys. Process_Date: 2002 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jane F. Denny Contact_Organization: US 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 Country: USA Contact_Voice_Telephone: 508-457-2311 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: jdenny@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: raster Raster_Object_Information: Raster_Object_Type: grid cell Row_Count: 382 Column_Count: 690 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: .9996 Longitude_of_Central_Meridian: -075.000000 Latitude_of_Projection_Origin: +00.000000 False_Easting: 500000 False_Northing: 0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 5 Ordinate_Resolution: 5 Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298257 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: Mean Lower Low Water Altitude_Resolution: 1 Altitude_Distance_Units: Meters Altitude_Encoding_Method: implicit coordinate Depth_System_Definition: Depth_Datum_Name: Local surface Depth_Resolution: 1 Depth_Distance_Units: Meters Depth_Encoding_Method: Attribute values Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Jane F. Denny Contact_Organization: US 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 Country: USA Contact_Voice_Telephone: 508-457-2311 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: jdenny@usgs.gov Resource_Description: b_of_grd Distribution_Liability: Altough this data set and its lineage have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or it's 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 items. Users must assume responsibility for the proper use of this data. This data should not be used at resolutions for which it is not intended. This data has no been reviewed for conformity with US Geological Survey editorial standards, or the North American Strigraphic code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the US Government. Metadata_Reference_Information: Metadata_Date: 20020119 Metadata_Review_Date: 2002 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Jane F. Denny Contact_Organization: US 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 Country: USA Contact_Voice_Telephone: 508-457-2311 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: jdenny@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: None Metadata_Use_Constraints: None