Type File Geodatabase Feature Class
Blocks and other cadastre information the BOEM produces are generated in accordance with 30 Code of Federal Regulations (CFR) Part 556.8 Subpart A, (formerly Part 256.8 Subpart A (2010)) to support Federal land ownership and mineral resource management.
Outer Continental Shelf (OCS) blocks serve as the legal definition for BOEM offshore boundary coordinates used to define small geographic areas within an Official Protraction Diagram (OPD) or Leasing Map (LM) for leasing and administrative purposes. These polygons are clipped to the Submerged Land Act Boundary and Continental Shelf Boundaries. Only the most recently published paper or PDF versions of the OPDs, LMs or Supplemental Official Block Diagrams (SOBDs) should be used for official or legal purpose.
These data were created in the applicable NAD83 UTM or NAD27 UTM/SPCS Projection and re-projected to GCS WGS84 (EPSG 4326) for management in BOEM's enterprise GIS. However, this service in this collection has been published in WGS 1984 Web Mercator Auxiliary Sphere (EPSG 3857). Because GIS projection and topology functions can change or generalize coordinates, these data are NOT an OFFICIAL record for the exact boundaries. These data are to be used for Cartographic purposes only and should not be used to calculate area.
Bureau of Ocean Energy Management (BOEM), Office of Strategic Resources (OSR), Geospatial Services Division (GSD)
https://www.usa.gov/publicdomain/label/1.0/
| West | -97.211212 | East | -81.137440 |
| North | 30.246047 | South | 23.822778 |
| Maximum (zoomed in) | 1:5,000 |
| Minimum (zoomed out) | 1:150,000,000 |
Bureau of Ocean Energy Management (BOEM), Office of Strategic Resources (OSR), Geospatial Services Division (GSD)
Gulf of Mexico Region
https://www.usa.gov/publicdomain/label/1.0/
This national dataset was created using data from both TIMS and BDS. The data generated from TIMS was imported from an oracle database into a geodatabase using the TIMS to BDS ETL. The data is stored in the applicable NAD27 (Gulf of Mexico) and appended to the WGS84 Geographic national geodatabase to display as the OCS Gulf of Mexico NAD27 Block Polygons – 2nd Division national dataset. The BDS Frontier Tool was used to generate the Protraction, Block and Aliquots for the Atlantic, Pacific, Territories and Gulf of Mexico areas only. The BDS OMC Dataset Creator was used to generate the National dataset and clip the Protractions, Block and Aliquots to the Submerged Land Act (SLA) Boundary and the Continental Shelf Boundary (CSB). This November 10, 2023, dataset is to be used as official cadastre data and is available for download.
OCS Gulf of Mexico NAD27 Block Polygons – 2nd Division
BOEM Boundary Delineation System
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
The identifier of a subdivision of an Official Protraction Diagram or Leasing Map. An OCS block number is a unique and constant designation. However, if changes occur to the map grid system and/or coastline, some blocks could become larger or smaller, or be created or deleted. (The total area in a block does not exceed 5,760 acres or 2,304 hectares).
BOEM Boundary Delineation System
Field in a feature class does not originate with any metadata authority.
The indicator used to identify the Bureau of Ocean Energy Management (BOEM) Outer Continental Shelf (OCS) Region.
BOEM Boundary Delineation System
Field in a feature class does not originate with any metadata authority.
The identifier of the Official Protraction Diagram or Leasing Map that the block falls within.
BOEM Boundary Delineation System
Field in a feature class does not originate with any metadata authority.
The name of the Official Protraction Diagram or Leasing Map that the block falls within.
BOEM Boundary Delineation System
Field in a feature class does not originate with any metadata authority.
The month, day, and year of the OCS Block that the boundary line resides within.
BOEM Boundary Delineation System
Field in a feature class does not originate with any metadata authority.
The total surface area within an OCS block. This includes all state, unencumbered federal and/or encumbered federal portions, such as deferred, disputed, Section 8(g), and/or withdrawn parcels. It is measured in acres or hectares as appropriate. The total area in a block does not exceed 5,760 acres or 2,304 hectares.
BOEM Boundary Delineation System
Field in a feature class does not originate with any metadata authority.
An explanation or description associated with individual block records.
BOEM Boundary Delineation System
Field in a feature class does not originate with any metadata authority.
The day, month, year the block is associated to the Official Protraction Diagram or Leasing Map it falls within and is uploaded to the database.
BOEM Boundary Delineation System
Field in a feature class does not originate with any metadata authority.
Area Code
BOEM Boundary Delineation System
Field in a feature class does not originate with any metadata authority.
Area code label
BOEM Boundary Delineation System
Field in a feature class does not originate with any metadata authority.
Feature geometry.
Esri
Coordinates defining the features.
Length of feature in internal units.
Esri
Positive real numbers that are automatically generated.
Area of feature in internal units squared.
Esri
Positive real numbers that are automatically generated.