Data collected for the mapping cooperative have been released in a series of USGS Open-File Reports (<http://woodshole.er.usgs.gov/project-pages/coastal_mass/html/current_map.html>). This spatial dataset is from the Cape Ann and Salisbury Beach Massachusetts project area. They were collected in two separate surveys in 2004 and 2005 and cover approximately 325 square kilometers of the inner continental shelf. High resolution bathymetry and backscatter intensity were collected in 2004 and 2005.
U.S. Geological Survey, 2008, PHYSIOGRAPHIC ZONES - General physiographic zones of the inner continental shelf between Cape Ann and Salisbury Beach Massachusetts.: Open-File Report 2007-1373, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, Massachusetts.This is part of the following larger work.Online Links:
Barnhardt, Walter A. , Andrews, Brian D. , Ackerman, Seth D. , Baldwin, Wayne E. , and Hein, Christopher J. , 2008, High-Resolution Geological Mapping of the Inner Continental Shelf: Cape Ann to Salisbury Beach, Massachusetts.: Open-File Report 2007-1373, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, Massachusetts.Online Links:
This is a Vector data set. It contains the following vector data types (SDTS terminology):
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000000. Longitudes are given to the nearest 0.000000. Latitude and longitude values are specified in Decimal degrees.
The horizontal datum used is D_WGS_1984.
The ellipsoid used is WGS_1984.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257224.
| Value | Definition |
|---|---|
| 1 | Nearshore Ramp-Areas of gently seaward sloping sand and gravel with complex bedforms. Depths 0-50 meters. |
| 2 | Rocky Zone-Areas of high-relief outcrops with bedrock, boulders and gravel. Depths 0-90 meters. |
| 3 | Shelf Valley-Areas of elongate depressions with rocky walls and sand and gravel thalwegs. Depths 12-25 meters. |
| 4 | Outer Basin-Areas of expansive smooth seafloor with muddy, thick sediment deposits. Depths greater than 50 meters. |
| 5 | Ebb Tidal Delta-Areas of broad sandy platforms seaward of inlets that are lobate in plan view. Depths less than 8 meters. |
| Value | Definition |
|---|---|
| RZ | Rocky Zone |
| NR | Nearshore Ramp |
| ETD | Ebb-tidal Delta |
| SV | Shelf Valley |
| OB | Outer Basin |
Sequential unique whole numbers that are automatically generated.
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
The purpose of this feature class is to qualitatively characterize the seafloor within the study area using five general physiographic zones. Geologic maps using these zones provide a regional view of the seafloor geology.
Person who carried out this activity:
508-548-8700 x2355 (voice)
508-457-2310 (FAX)
wbarnhardt@usgs.gov
Person who carried out this activity:
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Person who carried out this activity:
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Person who carried out this activity:
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
Barnhardt, Walter A. , Andrews, Brian D. , and Butman, Bradford, 2006, High-Resolution Mapping of the Inner Continental Shelf: Nahant to Gloucester, Massachusetts: Open-File Report 2005-1293, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
Ackerman, Seth D. , Butman, Bradford, Barnhardt, Walter A. , Danforth, William W. , and Crocker, James M. , 2006, High-Resolution Geologic Mapping of the Inner Continental Shelf: Boston Harbor and Approaches, Massachusetts: Open-File Report 2006-1008, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center, Woods Hole, MA.Online Links:
The accuracy of this interpretive data layer is dependant on the level of detail of the source material and interpretation procedures.
Survey data from USGS field activity numbers 05005 and 04015 were used as source data for these interpretations. The inshore boundary of this data layer extends shoreward of these source data. Source data for these shallow areas include aerial photographs and NOAA Nautical Charts. The aerial photographs were downloaded from MassGIS (<http://www.mass.gov/mgis/>).
Topology was built to indentify any topological errors such as gaps between adjacent polygons. All topological errors were verified and corrected.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints:
- The intended scale of these data is 1:25,000. Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.
508-548-8700 x2348 (voice)
bandrews@usgs.gov
Downloadable Data
Neither the U.S. Government, the Department of the Interior, nor the USGS, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. 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.
| Data format: | geologic interpretations of physiographic zones in format SHP (version ArcGIS 9.2) ESRI polygon shapefile Size: 0.12 Mb |
|---|---|
| Network links: |
<https://pubs.usgs.gov/of/2007/1373/GIS/shapefile/PhysiographicZones.zip> |
| Media you can order: |
DVD-ROM
(Density 4.75
Gbytes)
(format UDF)
|
These data are available as a shapefile in Environmental Systems Research Institute (ESRI) format. The shapefile is distributed in a compressed format as a WinZip (ver. 9.0) To utilize these data, the user must be able to uncompress the WinZip file and have software capable of viewing ESRI shapefiles.
508-548-8700 x2348 (voice)
508-457-2310 (FAX)
bandrews@usgs.gov
