# Alaska NAD 83 Limit of "8(g) Zone"

## Metadata:

- Identification_Information
- Data_Quality_Information
- Spatial_Data_Organization_Information
- Spatial_Reference_Information
- Entity_and_Attribute_Information
- Distribution_Information
- Metadata_Reference_Information

Identification_Information:
  Citation:
    Citation_Information:
      Originator: Bureau of Ocean Energy Management, Mapping and Boundary Branch
      Publication_Date: 20081024
      Title:
        Alaska NAD 83 Limit of "8(g) Zone"
      Geospatial_Data_Presentation_Form: vector digital data
      Series_Information:
        Series_Name: Digital Offshore Cadastre
        Issue_Identification: current
      Publication_Information:
        Publication_Place: Herndon, Virginia
        Publisher: Bureau of Ocean Energy Management, Mapping and Boundary Branch
      Online_Linkage: http://www.boem.gov/Oil-and-Gas-Energy-Program/Mapping-and-Data/Alaska/line_8g.aspx
      Online_Linkage: http://www.boem.gov/Oil-and-Gas-Energy-Program/Mapping-and-Data/Alaska.aspx
      Larger_Work_Citation:
        Citation_Information:
          Originator: Bureau of Ocean Energy Management, Mapping and Boundary Branch
          Publication_Date: 20081024
          Title:
            BOEM Offshore Cadastral Data
          Geospatial_Data_Presentation_Form: map
          Publication_Information:
            Publication_Place: Herndon, Virginia
            Publisher: Bureau of Ocean Energy Management, Mapping and Boundary Branch
  Description:
    Abstract:

        This data set contains the Limit of "8(g) Zone" boundary in ESRI shapefile format for the BOEM Alaska Region. The "8(g) Zone" lies between the Submerged Lands Act (SLA) boundary and a line projected 3 nautical miles seaward of the SLA boundary line. Within this zone, revenues are shared with the coastal state(s). Because GIS projection and topology functions can change or generalize coordinates, these GIS files are considered to be approximate and are NOT an OFFICIAL record for the exact SLA boundary. The Official Protraction Diagrams (OPDs) and Supplemental Official OCS Block Diagrams (SOBDs) serve as the legal definition for offshore boundary coordinates and area descriptions.

    Purpose:

        The Limit of "8(g) Zone" boundary and other cadastre information the BOEM produces are generated in accordance with 30 Code of Federal Regulations (CFR) 256.8 to support Federal land ownership and mineral resource management.

    Supplemental_Information:

        The 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 include Official Protraction Diagrams (OPDs), and Supplemental Official OCS Block Diagrams (SOBDs) in pdf format, and digital spatial data in ArcGIS shapefile format.

  Time_Period_of_Content:
    Time_Period_Information:
      Range_of_Dates/Times:
        Beginning_Date: 1994
        Ending_Date: 2006
    Currentness_Reference:

        publication date

  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: As needed
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -172.070891
      East_Bounding_Coordinate: -131.268433
      North_Bounding_Coordinate: 71.489040
      South_Bounding_Coordinate: 52.441241
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: None
      Theme_Keyword: Revenue Sharing
      Theme_Keyword: Submerged Lands Act (SLA) boundary
      Theme_Keyword: Cadastre
      Theme_Keyword: Lease blocks
      Theme_Keyword: Supplemental Official OCS Block Diagram, SOBD
      Theme_Keyword: Bureau of Ocean Energy Management, BOEM
      Theme_Keyword: OCS blocks
      Theme_Keyword: Outer Continental Shelf, OCS
      Theme_Keyword: Limit of "8(g) Zone"
      Theme_Keyword: Offshore
      Theme_Keyword: State Seaward Boundary, SSB
      Theme_Keyword: Oil and gas
      Theme_Keyword: Official Protraction Diagram, OPD
      Theme_Keyword: Federal State Boundary
    Place:
      Place_Keyword_Thesaurus: None
      Place_Keyword: Alaska, AK
      Place_Keyword: USA
      Place_Keyword: Pacific Ocean
      Place_Keyword: Beaufort Sea
      Place_Keyword: Chukchi Sea
      Place_Keyword: Arctic Ocean
      Place_Keyword: Bering Strait
      Place_Keyword: Bering Sea
      Place_Keyword: Bristol Bay
      Place_Keyword: Gulf of Alaska
  Access_Constraints: None. The BOEM Offshore Cadastral Data is in the public domain.
  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 digital data products or services.

  Point_of_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: Bureau of Ocean Energy Management, Mapping and Boundary Branch
      Contact_Position: Branch Chief
      Contact_Address:
        Address_Type: mailing and physical address
        Address:

            381 Elden Street

        Address:

            Mail Stop HM3120

        City: Herndon
        State_or_Province: Virginia
        Postal_Code: 20170
        Country: USA
      Contact_Voice_Telephone: (703) 787-1312
      Contact_Facsimile_Telephone: (703) 787-1236
      Contact_Electronic_Mail_Address: mapping.boundary.branch@boem.gov
      Hours_of_Service: 9:00am-4:00pm ET
  Browse_Graphic:
    Browse_Graphic_File_Name: http://www.boem.gov/uploadedImages/BOEM/Oil_and_Gas_Energy_Program/Mapping_and_Data/Alaska/AK_8G_BG.jpg
    Browse_Graphic_File_Description:
      An image of the BOEM Alaska Region, showing the official Limit of "8(g) Zone" with state review as a green solid line and the unofficial Limit of "8(g) Zone" lacking state review as a green dashed line
    Browse_Graphic_File_Type: JPEG
  Native_Data_Set_Environment:
    Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; ESRI ArcGIS 10.0.5.4400
  Cross_Reference:
    Citation_Information:
      Originator: Bureau of Ocean Energy Management, Mapping and Boundary Branch
      Publication_Date: 1994-2008
      Title:
        Official Protraction Diagrams (OPDs)
      Edition: current
      Geospatial_Data_Presentation_Form: diagram
      Publication_Information:
        Publication_Place: Herndon, Virginia
        Publisher: Bureau of Ocean Energy Management, Mapping and Boundary Branch
      Other_Citation_Details:
        At lower latitudes (0-48 degrees) OPDs are 1 degree in latitude by 2 degrees in longitude. At higher latitudes (48-75 degrees), OPDs are 3 degrees wide.
      Online_Linkage: http://www.boem.gov/Oil-and-Gas-Energy-Program/Mapping-and-Data/Alaska.aspx
      Larger_Work_Citation:
        Citation_Information:
          Originator: Bureau of Ocean Energy Management, Mapping and Boundary Branch
          Publication_Date: 1994-2008
          Title:
            BOEM Offshore Cadastral Data
  Cross_Reference:
    Citation_Information:
      Originator: Bureau of Ocean Energy Management, Mapping and Boundary Branch
      Publication_Date: 1994-2008
      Title:
        Supplemental Official OCS Block Diagrams (SOBDs)
      Edition: current
      Geospatial_Data_Presentation_Form: diagram
      Publication_Information:
        Publication_Place: Herndon, Virginia
        Publisher: Bureau of Ocean Energy Management, Mapping and Boundary Branch
      Other_Citation_Details:
        SOBDs contain official coordinate and area descriptions for individual blocks.
      Larger_Work_Citation:
        Citation_Information:
          Originator: Bureau of Ocean Energy Management, Mapping and Boundary Branch
          Publication_Date: 1994-2008
          Title:
            BOEM Offshore Cadastral Data

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Data_Quality_Information:
  Logical_Consistency_Report:

      The file is believed to be free of topologic errors.

  Completeness_Report:

      The Alaska statewide SLA boundary and Limit of "8(g) Zone" are currently incomplete.  It is incomplete in two different ways and in the following locations:

      1. Unofficial boundaries within the Norton Basin Planning Area, St. George Basin, Kodiak Planning Area and the South West portion of North Aleutian Basin Planning Area lack state review.

      2. The boundaries remain undeveloped within the Aleutian Arc Planning Area, Shumagin Planning Area and St. Matthew-Hall Planning Area.

      The solid SLA boundary and Limit of "8(g) Zone" lines depicted in the browse graphics reflect the official federal position for Submerged Lands Act and OCS Lands Act purposes. The areas of the fractional blocks abutting these lines have been determined and are as depicted on the Supplemental Official OCS Block Diagrams (SOBDs). Consult the SOBDs for official descriptions and approval dates.

      SOBDs have not been published for blocks adjoining the approximate short dashed SLA boundary and the Limit of "8(g) Zone". Coordinates and areal measurements for these blocks are not considered by BOEM to reflect an official federal position.  Another way to tell if a boundary is official or unofficial is by going to the SLA and 8g attribute table and look at the BDRY_COV_S field.  The 200801 (SLA) and 200802 (8g) attributes indicate an official boundary with state review.  The 200811 (SLA) and 200812 (8g) attributes indicate an unofficial boundary lacking state review.

  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report:

          Coordinates for points forming the Limit of "8(g) Zone" boundary are calculated to 3 decimal places of a meter in the TIMS database. However, GIS functions which build topology, change projections, etc. may alter coordinate values. Furthermore, most of the Limit of "8(g) Zone" boundary consists of true arcs, but has been approximated by these shapefiles with straight line segments. For these reasons, these shapefiles are considered to be approximate and are NOT an OFFICIAL record.

  Lineage:
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: Bureau of Ocean Energy Management, Mapping and Boundary Branch
          Publication_Date: 1994-2008
          Title:
            BOEM/BSEE/ONRR Technical Information Management System (TIMS)
          Geospatial_Data_Presentation_Form: database
          Publication_Information:
            Publication_Place: Herndon, Virginia
            Publisher: Bureau of Ocean Energy Management, Mapping and Boundary Branch
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Range_of_Dates/Times:
            Beginning_Date: 1994
            Ending_Date: 2006
        Source_Currentness_Reference:
          publication date
      Source_Citation_Abbreviation:
        TIMS
      Source_Contribution:

          Coordinates for points used to project the Limit of "8(g) Zone" boundary.

    Process_Step:
      Process_Description:

          In-house computer programs were used to project the 8g line at the appropriate distance from the baseline points. This was a planar projection done in Universal Transverse Mercator.

      Source_Used_Citation_Abbreviation:
        TIMS
      Process_Date: 2006
      Process_Contact:
        Contact_Information:
          Contact_Person_Primary:
            Contact_Organization: Bureau of Ocean Energy Management, Mapping and Boundary Branch
          Contact_Position: Branch Chief
          Contact_Address:
            Address_Type: mailing and physical address
            Address:

                381 Elden St.

            Address:

                Mail Stop HM3120

            City: Herndon
            State_or_Province: Virginia
            Postal_Code: 20170
            Country: USA
          Contact_Voice_Telephone: (703) 787-1312
          Contact_Facsimile_Telephone: (703) 787-1236
          Contact_Electronic_Mail_Address: mapping.boundary.branch@boem.gov
          Hours_of_Service: 9:00am-4:00pm ET

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Spatial_Data_Organization_Information:
  Indirect_Spatial_Reference_Method:
    U.S. Alaska Outer Continental Shelf (OCS)
  Direct_Spatial_Reference_Method: Vector
  Point_and_Vector_Object_Information:
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: String
      Point_and_Vector_Object_Count: 2622

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Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Geographic:
      Latitude_Resolution: 0.0000001
      Longitude_Resolution: 0.0000001
      Geographic_Coordinate_Units: Decimal Degrees
    Geodetic_Model:
      Horizontal_Datum_Name: North American Datum of 1983
      Ellipsoid_Name: Geodetic Reference System 1980
      Semi-major_Axis: 6378137.0
      Denominator_of_Flattening_Ratio: 298.257222101

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Entity_and_Attribute_Information:
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: AK_8G
    Attribute:
      Attribute_Label: FID
      Attribute_Definition:

          Internal feature number.

      Attribute_Definition_Source:

          ESRI

      Attribute_Domain_Values:
        Unrepresentable_Domain:
          Sequential unique whole numbers that are automatically generated.
    Attribute:
      Attribute_Label: Shape
      Attribute_Definition:

          Feature geometry.

      Attribute_Definition_Source:

          ESRI

      Attribute_Domain_Values:
        Unrepresentable_Domain:
          Coordinates defining the features.
    Attribute:
      Attribute_Label: FNODE_
      Attribute_Definition:

          From node in ESRI notation

    Attribute:
      Attribute_Label: TNODE_
      Attribute_Definition:

          To node in ESRI notation

    Attribute:
      Attribute_Label: LPOLY_
      Attribute_Definition:

          Left polygon in ESRI notation

    Attribute:
      Attribute_Label: RPOLY_
      Attribute_Definition:

          Right polygon in ESRI notation

    Attribute:
      Attribute_Label: LENGTH
      Attribute_Definition:

          Line length in ESRI coverage units

    Attribute:
      Attribute_Label: LINE_8G_
      Attribute_Definition:

          Internal ESRI number

    Attribute:
      Attribute_Label: LINE_8G_ID
      Attribute_Definition:

          Internal ESRI number

    Attribute:
      Attribute_Label: MMS_REGION
      Attribute_Definition:

          Region Code is the identifier used to identify the BOEM Outer Continental Shelf (OCS) Region.

      Attribute_Definition_Source:

          Bureau of Ocean Energy Management

    Attribute:
      Attribute_Label: BDRY_TYPE_
      Attribute_Definition:

          Boundary Type Code (G = Limit of "8(g) Zone")

      Attribute_Definition_Source:

          Bureau of Ocean Energy Management

    Attribute:
      Attribute_Label: BDRY_PT_PR
      Attribute_Definition:

          Boundary Point Protraction Number

      Attribute_Definition_Source:

          Bureau of Ocean Energy Management

    Attribute:
      Attribute_Label: BDRY_APRV_
      Attribute_Definition:

          Boundary Approval Date (day-month-year)

      Attribute_Definition_Source:

          Bureau of Ocean Energy Management

    Attribute:
      Attribute_Label: BLOCK_NUMB
      Attribute_Definition:

          Block Number the line segment is in

      Attribute_Definition_Source:

          Bureau of Ocean Energy Management

    Attribute:
      Attribute_Label: BDRY_NM_CD
      Attribute_Definition:

          Boundary Name Code

      Attribute_Definition_Source:

          Bureau of Ocean Energy Management

    Attribute:
      Attribute_Label: BDRY_NM_TX
      Attribute_Definition:

          Boundary Name Text

      Attribute_Definition_Source:

          Bureau of Ocean Energy Management

    Attribute:
      Attribute_Label: BDRY_COV_S
      Attribute_Definition:

          Boundary Cover Sequence Number

      Attribute_Definition_Source:

          Bureau of Ocean Energy Management

    Attribute:
      Attribute_Label: Shape_Leng
      Attribute_Definition_Source:

          ESRI

  Overview_Description:
    Entity_and_Attribute_Detail_Citation:

        Bureau of Ocean Energy Management

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Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: Bureau of Ocean Energy Management, Mapping and Boundary Branch
      Contact_Address:
        Address_Type: mailing and physical address
        Address:

            381 Elden St.

        Address:

            Mail Stop  HM3120

        City: Herndon
        State_or_Province: Virginia
        Postal_Code: 20170
        Country: USA
      Contact_Voice_Telephone: (703) 787-1312
      Contact_Facsimile_Telephone: (703) 787-1236
      Contact_Electronic_Mail_Address: mapping.boundary.branch@boem.gov
      Hours_of_Service: 9:00am-4:00pm ET
  Resource_Description: Digitial Offshore Cadastre
  Distribution_Liability:

      As is. No responsibility is assumed for the correctness of this data.

  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: Shapefile
        Format_Version_Number: 10.0
        Transfer_Size: 4.459
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: http://www.boem.gov/Oil-and-Gas-Energy-Program/Mapping-and-Data/Alaska.aspx
          Access_Instructions:
            From the GIS Files Section of the webpage, click on the shapefile you wish to download. The downloaded file will need to be unzipped.
          Online_Computer_and_Operating_System:
            Windows

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Metadata_Reference_Information:
  Metadata_Date: 20121220
  Metadata_Review_Date: 20121220
  Metadata_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: Bureau of Ocean Energy Management, Mapping and Boundary Branch
      Contact_Position: Branch Chief
      Contact_Address:
        Address_Type: mailing and physical address
        Address:

            381 Elden St

        Address:

            Mail Stop HM3120

        City: Herndon
        State_or_Province: Virginia
        Postal_Code: 20170
        Country: USA
      Contact_Voice_Telephone: (703) 787-1312
      Contact_Facsimile_Telephone: (703) 787-1236
      Contact_Electronic_Mail_Address: mapping.boundary.branch@boem.gov
      Hours_of_Service: 9:00am - 4:00pm ET
  Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Time_Convention: local time
  Metadata_Extensions:
    Online_Linkage: http://www.esri.com/metadata/esriprof80.html
    Profile_Name: ESRI Metadata Profile
  Metadata_Extensions:
    Online_Linkage: http://www.esri.com/metadata/esriprof80.html
    Profile_Name: ESRI Metadata Profile

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