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OCS Block Polygons - 2nd Division

Published by Bureau of Ocean Energy Management | Department of the Interior | Catalog Last Checked: May 26, 2026 at 03:38 PM | Dataset Last Updated: March 31, 2026 at 12:00 AM
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) for leasing and administrative purposes. These polygons are clipped to the Submerged Land Act Boundary and Continental Shelf Boundaries. OCS blocks relate back to individual Official Protraction Diagrams (OPDs) and are not uniquely numbered. A block is uniquely described by the Protraction Number and Block Number (e.g., NK18-02, Block 6822). A full OCS block is 4800 x 4800 meters. Smaller, clipped aliquots are found along the Federal/State OCS boundary and along UTM zone borders. Only the most recently published paper or PDF versions of the OPDs or Supplemental Official Block Diagrams (SOBDs) should be used for official or legal purposes.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.

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Complete Metadata
@type dcat:Dataset
accessLevel public
bureauCode 
                                            [
  "010:06"
]
contactPoint 
                                            {
  "fn": "BOEM_GeoSEAS",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:geoseas@boem.gov"
}
description <div style='text-align:Left;'><div><div><p><span>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) for leasing and administrative purposes. These polygons are clipped to the Submerged Land Act Boundary and Continental Shelf Boundaries. OCS blocks relate back to individual Official Protraction Diagrams (OPDs) and are not uniquely numbered. A block is uniquely described by the Protraction Number and Block Number (e.g., NK18-02, Block 6822). A full OCS block is 4800 x 4800 meters. Smaller, clipped aliquots are found along the Federal/State OCS boundary and along UTM zone borders. Only the most recently published paper or PDF versions of the OPDs or Supplemental Official Block Diagrams (SOBDs) should be used for official or legal purposes.</span></p><p><span>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, </span><span style='font-weight:bold;'>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.</span></p></div></div></div>
distribution 
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identifier https://www.arcgis.com/home/item.html?id=06f9eddec8a44de7aa79869b5ebc62eb&sublayer=7
issued 2026-05-21T13:39:30Z
keyword 
                                            [
  "Administrative",
  "Alaska",
  "Atlantic",
  "BDS",
  "BOEM",
  "Blocks",
  "Boundary Delineation System",
  "Bureau of Ocean Energy Management",
  "Cadastre Theme",
  "Conventional Energy",
  "Energy",
  "Gas",
  "Gulf",
  "ISO 19115",
  "Marine Minerals",
  "OCS",
  "OMC",
  "OPDs",
  "Official Protraction Diagrams",
  "Offshore Marine Cadastre",
  "Oil",
  "Outer Continental Shelf",
  "Pacific",
  "Renewable Energy",
  "SOBDs",
  "Supplemental Official Block Diagrams",
  "U.S. Territories",
  "Wind"
]
landingPage https://boem-metaport-boem.hub.arcgis.com/datasets/BOEM::ocs-block-polygons-2nd-division-1
modified 2026-03-31T00:00:00Z
programCode 
                                            [
  "010:000"
]
publisher 
                                            {
  "name": "Bureau of Ocean Energy Management",
  "@type": "org:Organization"
}
spatial -180.0000,-17.5553,180.0000,74.9964
theme 
                                            [
  "geospatial"
]
title OCS Block Polygons - 2nd Division

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