Abstract:
This data set contains Official Protraction Diagrams (OPDs) in Adobe PDF
format. Atlantic Region OPDs are approximately 2 degrees wide by one degree
high. OPDs are further subdivided into blocks that are 4800 x 4800 meters
on a UTM plane. Where the OPD hits the UTM zone boundary, that zone boundary
will be a geodesic line - which will appear slightly curved on the UTM plane.
OPDs are numbered using the United Nations International Map of the World
Numbering System, and are generally named for land or hydrographic features
contained within the limits of the diagram. Further information on the
historic development of OPD's can be found in OCS Report MMS 99-0006:
Boundary Development on the Outer Continental Shelf:
http://www.boemre.gov/itd/pubs/1999/99-0006.PDF
Also see the metadata for each of the individual GIS files used to create
these OPDs.
The Official Protraction Diagrams (OPDs) and Supplemental Official Block
Diagrams (SOBDs), serve as the legal definition for BOEMRE offshore boundary
coordinates and area descriptions.
Supplemental_Information:
The BOEMRE is making its existing cadastre data available at
http://www.boemre.gov/offshore/mapping/. These data include Official
Protraction Diagrams (OPDs), and Supplemental Official OCS Block
Diagrams (SOBDs) in pdf format, and digital spatial data in ArcGIS
shapefile format.