ANCSA Corporation Boundaries NAD83

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Frequently anticipated questions:

What does this data set describe?

Title: ANCSA Corporation Boundaries NAD83
The boundaries of the native regional corporations created by the Alaska Native Claims Settlement Act (ANCSA) were derived in March 1992 from the 1990 TIGER database, prepared by the US Census Bureau. TIGER line data was snapped to the township grid coverage. Other edits followed visual comparison to the Bureau of Land Management's (BLM) "Alaska Land Status Map" dated June 1987.
Data was projected from Alaska Albers to Geographic and transformed from NAD27 to NAD83 by the BLM for use in it's Statewide GIS Data Warehouse.
Original file from Tiger database and snapped to twpspoly. Edits made after comparing with BLM land status map of 6/87. Annotation subclass anno2mil - annosymbol 908 - added 1/94. QC by Dave Luck 2/4/94.
Revisions: Edits 1/31/94 by J. Tam Adjusted ANCSA Corporation boundaries to follow those shown on the BLM map titled Alaska Land Status Map from June 1987. Mainly modified the arcs that form the outer polygon; i.e. the ones out in the water. Had to extrapolate for Calista Corp and Aleut Corp because the source map does not show the entire state. Also added annotation subclass anno2mil - annosymbol 908 in textset font61.txt - to draw corporation names for maps at 1:2500000.
QC by Dave Luck completed 2/4/94.
Modifications 1/13/95 by J. Tam: Replace common boundary between Arctic Slope Regional Corporation and NANA Regional Corporation with arcs from updated BORO coverage which in turn was from a coverage created by Ron VanPelt who used ../sections/new_k and new_u; ../grids/ll1x1 and itma.
4/25/95 K Zeiner Replaced the Canadian border in southeast with the border from the /net/beluga/db/alaska/grids/twpspoly.
7/20/95 - J. Tam Unsplit arcs. Placed nodes at qmq borders to facilitate use of POLYGONBORDERTEXT command when making qmq plots.
Reviews_Applied_to_Data: Visual comparison of the BLM's "Alaska Land Status Map" June 1987 was made. See "Revisions" for more details.
Related_Spatial_and_Tabular_Data_Sets: none
Other_References_Cited: US Census Bureau, 1990 TIGER database US Bureau of Land Management, Alaska Land Status Map, June 1987
Notes: Projection: Albers Date Received: 2/92 Verified: J. Tam 7/92 Documented by: J. Tam 7/13/92
BLM Notes: Projection: Geographic Datum: NAD83 Date Received: February 5, 2007 Verified By: Tim Varner Documented By: Tim Varner 20070205
  1. How should this data set be cited?

    Bureau of Land Management, 20070205, ANCSA Corporation Boundaries NAD83.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -180.000000
    East_Bounding_Coordinate: 180.000000
    North_Bounding_Coordinate: 72.093287
    South_Bounding_Coordinate: 49.998334

  3. What does it look like?

    <http://ilmakso0db10/metadata/images/ancsa_corporation_boundaries_nad83.png> (PNG)
    ANCSA Corporation Boundaries

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 05-Feb-2007
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • G-polygon (12)

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.0000001. Longitudes are given to the nearest 0.0000001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

  7. How does the data set describe geographic features?

    feature class (Source: ESRI)

    name of ANCSA Corporation (Source: US Census Bureau)

    Cook Inlet Region IncName of ANCSA Corporation
    Koniag IncName of ANCSA Corporation
    Arctic Slope Regional CorpName of ANCSA Corporation
    N.A.N.A. Regional CorpName of ANCSA Corporation
    Bering Straits Native CorpName of ANCSA Corporation
    Bristol Bay Native CorpName of ANCSA Corporation
    Doyon LtdName of ANCSA Corporation
    Calista CorpName of ANCSA Corporation
    Ahtna IncName of ANCSA Corporation
    The Aleut CorpName of ANCSA Corporation
    Chugach Alaska CorpName of ANCSA Corporation
    Sealaska CorpName of ANCSA Corporation

    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    Alaska Department of Natural Resources

  3. To whom should users address questions about the data?

    GIS Public Access Coordinator
    AK Department of Natural Resources - Land Records Information Section
    GIS Public Access Coordinator
    550 W. 7th Suite 706
    Anchorage, AK 99501

    907 269 8833 (voice)
    907 269 8920 (FAX)

    Hours_of_Service: 800-1600 AST
    Contact_Instructions: See Distribution_Information

Why was the data set created?

Mapping purposes - statewide.

How was the data set created?

  1. From what previous works were the data drawn?

    TIGER data (source 1 of 1)
    Bureau, US Census , 1990, 1990 TIGER line files database: unknown unknown, US Census Bureau, unknown.

    Type_of_Source_Media: tape
    Source_Scale_Denominator: 250000
    Source_Contribution: unknown

  2. How were the data generated, processed, and modified?

    Date: Unknown (process 1 of 4)
    NAT_CORP coverage imported into geodatabase.

    Date: 10-Oct-2005 (process 2 of 4)
    Feature class data copied to materialized view.

    Date: unknown (process 3 of 4)
    Materialized view data extracted and converted to Shape format.

    Date: 05-Feb-2007 (process 4 of 4)
    1. Projected from Alaska Albers to Geographic. 2. Transformed from NAD27 to NAD83 using NADCON for Alaska

    Person who carried out this activity:

    Tim Varner
    Bureau of Land Management
    IT Specialist
    222 W. 7th Ave #13
    Anchorage, AK 99513

    (907) 271-5799 (voice)

  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?


  2. How accurate are the geographic locations?

    Visual comparison of data with BLM's Alaska Land Status Map. Snapped arcs to township coverage.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?


  5. How consistent are the relationships among the observations, including topology?

    Polygon topology present.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

To ensure distribution of the most current public information, please refer requests for data or products to the Alaska Department of Natural Resources, Land Records Information Section.
It is not recommended the data be used at a scale larger than 1:1,000,000
Any hardcopies or published datasets utilizing these data sets shall clearly indicate their source. If the user has modified the data in any way they are obligated to describe the types of modifications they have performed. User specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the Alaska Department of Natural Resources.

  1. Who distributes the data set? (Distributor 1 of 1)

    Alaska Department of Natural Resources - Land Records Information Section
    GIS Public Access Coordinator
    550 W. 7th Suite 706
    Anchorage, AK 99501

    907 269 8833 (voice)
    907 269 8920 (FAX)

  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    The State of Alaska makes no express or implied warranties (including warranties of merchantability and fitness) with respect to the character, function, or capabilities of the electronic services or products or their appropriateness for any users purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products, any failure thereof or otherwise, and in no event will the State of Alaska s liability to the requestor or anyone else exceed the fee paid for the electronic service or product.

  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 05-Feb-2007
Metadata author:
AK Department of Natural Resources - Land Records Information Section
Attn: REQUIRED: The person responsible for the metadata information.
GIS Public Access Coordinator
550 W. 7th Suite 706
Anchorage, AK 99501

907 269 8833 (voice)
907 269 8920 (FAX)

Hours_of_Service: 800-1600 AST
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.12 on Tue Oct 16 11:22:38 2018