This data set contains the outlines for historic (i.e., relinquished or inactive) federal oil and gas leases in the Alaska OCS Region through sale 193. They represent a close approximation, but might not be the exact coordinates for those leases. For the official coordinates please refer to the OPD or SOBD for the lease. ALSO NOTE: older leases were done on a NAD 27 grid, and their lease coordinates will not change as long as the lease remains active. Although the NAD 27 leases have been projected to NAD 83 for inclusion in this file, when plotted on the current NAD 83 leasing grid, they will not appear to "line up", because the NAD 83 grids represents a complete re-grid and not a re-projection of the old NAD 27 grid. All current leasing, starting with Sale 144 in September 1996 has been done on the NAD 83 grid.
This shape file contains all the leases that have been issued in the Alaska OCS Region in the past.
BOEM is making its existing cadastre data available at http://www.boem.gov/Oil-and-Gas-Energy-Program/Mapping-and-Data/Index.aspx. These data will include digital images of BOEM data at the regional, planning area, Official Protraction Diagram (OPD), and Supplemental Official OCS Block Diagram (SOBD)s and digital spatial data in ArcMap shape format at the regional levels.
publication date
The data was developed within the U.S. Government; no proprietary rights may be attached to them nor may they be sold to the U.S. Government as part of any procurement of digital data products or services. These GIS files represent a close approximation, but not the exact Coordinates for any lease. For the official lease coordinates please refer to the OPD, SOBD, or CBD for the lease block.
3801 Centerpoint Drive, Suite 500
Mail Stop 8300
All polygons are assumed to be clean with no errors. No specific tests have been performed.
All historic federal offshore leases as of June, 2012, are included.
These coverages are assumed to be accurate to .5 meters or better.
Coordinates of the block corners were taken from TIMS.
The coordinate values and attributes were pulled from the TIMS database system and converted to ArcInfo files. All-of-block leases are built in longitude/latitude coordinates and cleaned at a resolution of .000001. Partial block leases are built in their OPD native projection zone. True curves are approximated with a series of straight line segments. Arc approximation is performed until one of two criteria is met: (a) the angular difference between adjacent curve approximation points reaches .01 degree, or (b) a maximum of 496 approximation points is used to redefine the true arc. Partial block leases are cleaned to a tolerance of .5 meters, then projected into longitude/latitude coordinates and combined with the coverage for all-of-block leases. The resultant coverage is then cleaned again to a tolerance of 0.000001.
3801 Centerpoint Drive, Suite 500
Metadata imported.
Metadata imported.
Metadata imported.
Internal feature number.
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Feature geometry.
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Area of feature in internal units squared.
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Area of feature in internal units squared.
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Area of feature in internal units squared.
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This shape file contains the following entities: FID: Sequential numbers 0-674 Shape: Polygon Shape Area: Size of polygon in ESRI coverage units LEASE_NUMB: The BOEM lease number SALE_NUMBE: The BOEM Sale number when the lease was sold Shape Area: Size of polygon in ESRI coverage units SHAPE_FID: Sequential numbers 1-675
381 Elden Street
Mail Stop HM3120
As is. No responsibility is assumed for the correctness of this data.
3801 Centerpoint Drive
Suite 500