Outer Continental Shelf Submerged Lands Act Boundary - Pacific Region - West Coast NAD83

Metadata Updated: February 25, 2021

This data set contains the Submerged Lands Act (SLA)boundary line (also known as the State Seaward Boundary (SSB) and Fed State Boundary) for the BOEM Pacific Region in ESRI ArcGIS shape file format. The SLA defines the seaward limit of a state owned submerged lands and the landward boundary of federally managed Outer Continental Shelf (OCS) lands. In the BOEM Pacific Region the SLA is projected 3 nautical miles offshore from the coastal baseline. Further information on the SLA and development of this line from baseline points can be found in OCS Report BOEM 99-0006: Boundary Development on the Outer Continental Shelf. https://www.boem.gov/BOEM-Newsroom/Library/Publications/1999/99-0006-pdf.aspx The SLA boundary was developed using nautical charts, topographic maps, and hydrographic surveys to identify coastal baseline points. For California, there was a wide range of map scales used (1:200 – 1:100,000). The Minerals Management Service (MMS - the predecessor bureau to BOEM) used mapping software that was developed in-house to mathematically project the SLA boundary 3 nautical miles seaward from the baseline. For purposes of the SLA, all coordinates are assumed as absolute values with a precision of three decimals of a meter. For purposes other than the SLA, the actual positional precision for a scale of 1:40,000 is approximately 23 meters. In 1992, MMS adopted NADCON v.2.00 or better as the bureau standard horizontal datum transformation software, and reiterated that, for its purposes, “the World Geodetic System of 1984 (WGS 84) is considered equivalent to NAD 83 offshore of Alaska and the conterminous United States.” 57 Fed. Reg. 5168 (February 12, 1992). On December 24, 2014, the SLA boundary offshore of California was fixed (permanently immobilized) by a decree issued by the U.S. Supreme Court. United States v. California, 135 S. Ct. 563 (2014). For a detailed discussion on the fixing of the SLA boundary for California, please see https://www.boem.gov/Oil-and-Gas-Energy-Program/Mapping-and-Data/Multi-Purpose-Marine-Cadastre-Map-Viewer/Court-Decisions.aspx Because GIS projection and topology functions can change or generalize coordinates, these GIS shape files are NOT an OFFICIAL record for the exact Submerged Lands Act Boundary.The official record is reflected through the coordinates listed in the decree, and the boundary shown on the BOEM Supplemental Official Block Diagrams, which are available at https://www.boem.gov/Oil-and-Gas-Energy-Program/Mapping-and-Data/Pacific.aspx

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Date February 1, 2021
Metadata Created Date November 12, 2020
Metadata Updated Date February 25, 2021
Reference Date(s) February 10, 2006 (publication)
Frequency Of Update asNeeded

Metadata Source

Harvested from DOI Open Data

Additional Metadata

Resource Type Dataset
Metadata Date February 1, 2021
Metadata Created Date November 12, 2020
Metadata Updated Date February 25, 2021
Reference Date(s) February 10, 2006 (publication)
Responsible Party Bureau of Ocean Energy Management, Mapping and Boundary Branch (Point of Contact)
Contact Email
Access Constraints Use Constraints: 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 ADP products or services., Access Constraints: None. The Block and Boundary data is in the public domain.
Bbox East Long -117.18
Bbox North Lat 48.46
Bbox South Lat 32.53
Bbox West Long -124.86
Coupled Resource
Frequency Of Update asNeeded
Graphic Preview Description An image of the BOEM Pacific Region Submerged Lands Act GIS data file.
Graphic Preview File pac_fedstate.gif
Graphic Preview Type GIF
Licence As is. No responsibility is assumed for the correctness of this data.
Metadata Language
Metadata Type geospatial
Old Spatial {"type": "Polygon", "coordinates": [[[-124.86, 32.53], [-117.18, 32.53], [-117.18, 48.46], [-124.86, 48.46], [-124.86, 32.53]]]}
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

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