Summary

Description

This data set contains BOEM Planning Area outlines in ESRI shapefile format for the BOEM Alaska Region. The Submerged Lands Act (SLA) boundary, along with the Continental Shelf Boundary (CSB), the Limit of Protraction were used to complete the polygons for the Planning Areas. Because GIS projection and topology functions can change or generalize coordinates, and because shapefiles can not represent true arcs, these GIS files are considered to be approximate and are NOT an OFFICIAL record for the exact block coordinates or areas. The Official Protraction Diagrams (OPDs) and Supplemental Official OCS Block Diagrams (SOBDs) serve as the legal definition for BOEM offshore boundary coordinates and area descriptions. If any discrepancies are found between these shapefiles and the OPDs and SOBDs, it is the OPD and SOBD diagrams which take precidence. Also note that the BOEM cadastre is developed on a UTM projection, and most Planning Areas span multiple UTM zones. This means that area values computed from these shapefiles will not match the official BOEM areas.