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OCS Gulf NAD27 Block Polygons - 2nd Division

Published by Bureau of Ocean Energy Management | Department of the Interior | Catalog Last Checked: May 28, 2026 at 04:25 PM | Dataset Last Updated: May 27, 2026 at 06:39 PM
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. 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) 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. </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. 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=b1ac83083464455588a893bf2b845291&sublayer=9
issued 2026-05-21T13:51:21Z
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-gulf-nad27-block-polygons-2nd-division
modified 2026-05-27T18:39:19.187Z
programCode 
[
  "010:000"
]
publisher 
{
  "name": "Bureau of Ocean Energy Management",
  "@type": "org:Organization"
}
spatial -97.2115,23.8230,-81.1372,30.2463
theme 
[
  "geospatial"
]
title OCS Gulf NAD27 Block Polygons - 2nd Division

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