This bathymetric shapefile contains 10 m contours for the continental shelf and 100 m beyond the 200 m shelf edge. The contours have been derived from the National Oceanic and Atmospheric Administration (NOAA), National Geophysical Data Center (NGDC), Coastal Relief Models volume 1 and 2. Note: These data were reprojected from their native projection into North American Datum 1983 (NAD83) / Massachusetts State Plane coordinate system, Mainland Zone (Fipszone 2001) meters by the Massachusetts Office of Coastal Zone Management on June 26, 2006.
Purpose:
This data overlay is intended to provide a highly detailed bathymetric contour interval for the NY Bight and Gulf of Maine area. The bathymetric shapefile contains 10 m contours for the continental shelf and 100 m intervals beyond the 200m shelf edge. These contours will be used by the Sand and Gravel assessment project to aid in the interpretation and creation of a geologic map of the sedimentary character of the seafloor for the area.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20021007
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -77.846192
East_Bounding_Coordinate: -64.629965
North_Bounding_Coordinate: 45.260587
South_Bounding_Coordinate: 34.877240
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: CMGP
Theme_Keyword: Geographic Information System
Theme_Keyword: GIS
Theme_Keyword: ArcView shapefile
Theme_Keyword: polyline
Theme_Keyword: 10 meter shelf contours
Theme_Keyword: 10 m shelf contours
Theme_Keyword: bathymetry contours
Theme_Keyword: National Assessment of Marine Sand and Gravel Resources
Theme_Keyword: Open-File Report 03-001
Theme_Keyword: OFR 03-001
Place:
Place_Keyword_Thesaurus: General
Place_Keyword: United States East Coast
Place_Keyword: U.S. East Coast
Place_Keyword: U.S. northeast
Place_Keyword: New England
Place_Keyword: Mid-Atlantic
Place_Keyword: Gulf of Maine
Place_Keyword: New York Bight
Place_Keyword: Maine
Place_Keyword: New Hampshire
Place_Keyword: Massachusetts
Place_Keyword: Rhode Island
Place_Keyword: Connecticut
Place_Keyword: New York
Place_Keyword: New Jersey
Place_Keyword: Delaware
Place_Keyword: Maryland
Place_Keyword: Virginia
Place_Keyword: North Carolina
Place_Keyword: continental shelf
Place_Keyword: continental margin
Place_Keyword: Georges Bank
Access_Constraints: None
Use_Constraints:
The U.S. Geological Survey must be referenced as the originator of the dataset in any future products or research derived from these data.
This dataset is not to be used for navigation purposes.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Valerie Paskevich
Contact_Organization: U.S. Geological Survey
Contact_Position: Information Technology Specialist
The CRM PCI database was processed to extract a subset of the combined dataset. A 5X5 low-pass smoothing filter was applied to the image data to reduce the gridding artifacts.
Two additional 16 bit channels were added to the newly created PCI database containing the data subset. The CRM data was processed to create separate land and sea image channels by replacing the values above and below the desired data level with -32768.
Source_Used_Citation_Abbreviation: seagrd.pix
Process_Date: 20020806
Source_Produced_Citation_Abbreviation: seagrd.pix
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Valerie Paskevich
Contact_Organization: U.S. Geological Survey
Contact_Position: Information Technology Specialist
An image mask of the bathymetry data was created. The XPACE CONTOUR program was run on the CRM data to create a 100m contour segment of the original data. The CRM image was then subsetted to create a bathymetry image with values between 11-200 meters and contoured at 10m. The created contours were then thinned by 50% (VECSEL).
Source_Used_Citation_Abbreviation: seagrd.pix
Process_Date: 20020806
Source_Produced_Citation_Abbreviation: seagrd.pix
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Valerie Paskevich
Contact_Organization: U.S. Geological Survey
Contact_Position: Information Technology Specialist
All contours greater than 200 m were removed from the 10 m contour segment to remove redundancy of the 100 m contours before combining the 10 m and 100 m contours as one segment.
Source_Used_Citation_Abbreviation: seagrd.pix
Process_Date: 20020806
Source_Produced_Citation_Abbreviation: seagrd.pix
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Valerie Paskevich
Contact_Organization: U.S. Geological Survey
Contact_Position: Information Technology Specialist
The bathymetry contours were viewed and edited using Imageworks to verify and improve the dataset. Small contours that were believed to be artifacts of the CRM gridded data were removed. Vector segments that could be combined to produce complete polylines were joined.
Source_Used_Citation_Abbreviation: seagrd.pix
Process_Date: 20020813
Source_Produced_Citation_Abbreviation: seagrd.pix
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Valerie Paskevich
Contact_Organization: U.S. Geological Survey
Contact_Position: Information Technology Specialist
Downloadable Data; National Assessment of Marine Sand and Gravel Resources: ny_gome_contours.shp
Distribution_Liability:
Although this data set has been used by the U.S. Geological Survey, 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. 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.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ArcView shapefile
Format_Version_Number: 3.2
Format_Specification: ESRI polyline shapefile
File_Decompression_Technique: zip
Transfer_Size: 40.240
Digital_Transfer_Option:
Offline_Option:
Offline_Media: CD-ROM
Recording_Capacity:
Recording_Density: 650
Recording_Density_Units: Mbytes
Compatibility_Information:
The user must have a computer system with a CD-ROM available. To browse the information contained on this CD-ROM, the user must have a current WWW browser available. The user must also have software installed on their computer to unzip the archived file.
Technical_Prerequisites:
The data is available in ArcView shapefile format. The user must have ArcView 3.0 or greater software to read and process the data file. In lieu of ArcView, the user may utilize another GIS application package capable of importing data.