USGS ASCII trackline bathymetry

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

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

 

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

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

Place_Keyword: USGS

Place_Keyword: Woods Hole Field Center (WHFC)

Place_Keyword: Eastern Regional Center

Access_Constraints:

None

Use_Constraints:

These data are not to be used for navigational purposes.

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