National Petroleum Reserve Alaska Administrative Lease Line (NAD83)

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Frequently anticipated questions:


What does this data set describe?

Title:
National Petroleum Reserve Alaska Administrative Lease Line (NAD83)
Abstract:
The NPRA Administrative Coastal Boundary dataset is a continuous, point to point listing of all angle points for the Final Administrative Lease Line of the National Petroleum Reserve - Alaska (administrative lease line). The listing runs from east to west.
All Public Land Survey System references are for the Umiat Meridian, Alaska.
N.P.R.A. refers to National Petroleum Reserve - Alaska.
No angle points for the administrative lease line of the N.P.R.A. fall in the interior of T. 17 N., R. 26 W., and T. 22 N., R. 18 W.
All latitudes and longitudes are on the North American Datum 1927.
  1. How should this data set be cited?

    Bureau of Land Management, 20071102, National Petroleum Reserve Alaska Administrative Lease Line (NAD83).

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -161.878791
    East_Bounding_Coordinate: -151.133606
    North_Bounding_Coordinate: 71.389543
    South_Bounding_Coordinate: 70.288900

  3. What does it look like?

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

    Calendar_Date: 24-Oct-2007
    Currentness_Reference: publication date

  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):

      • String (8010)

    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 0.000000000000089. Longitudes are given to the nearest 0.000000000000089. 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?

    base_data:sde.npra_admin_coastal_bndy_gcsnad83
    NPRA Administrative Lease Line (Source: Bureau of Land Mangement)

    objectid
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    shape
    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?

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

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

    (907) 271-5799 (voice)
    tvarner@blm.gov


Why was the data set created?

This dataset was created as a spatial representation of the angle points the NPRA Final Administrative Lease Line and points of intersection with the Public Land Survey System and the NPRA Final Administrative Lease Line.


How was the data set created?

  1. From what previous works were the data drawn?

    None (source 1 of 1)
    Bureau of Land Management, 20071024, NPRA Administrative Coastal Points (NAD27).

    Type_of_Source_Media: ArcSDE Point Feature Class
    Source_Contribution: Bureau of Land Management

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

    Date: 02-Nov-2007 (process 1 of 1)
    Loaded formated point data from table provided by Frank Hardt - BLM Cadastral Land Surveyor of points from Federal Register for the NPRA Administrative Coastal Boundary Points dataset is a continuous, point to point listing of all angle points for the Final Administrative Lease Line of the National Petroleum Reserve - Alaska (administrative lease line). The listing runs from east to west.
    The query below was created as a stored procedure in Informix which populates the line strings from paris of points.
    --linecoord_npra.sql create procedure linecoord_npra() define x1, y1, x2, y2 float; define bcor, ecor, obj_id, nbr_rows, i integer; -- process each line let nbr_rows = (select max(objectid) from npra_admin_coastal_points) - 1 ; let obj_id = 0; while obj_id < nbr_rows begin let bcor = obj_id + 1; let ecor = bcor + 1; select dd_longitude, dd_latitude into x1,y1 from npra_ad min_coastal_points where objectid = bcor; select dd_longitude, dd_latitude into x2,y2 from npra_ad min_coastal_points where objectid = ecor; let obj_id = obj_id + 1; insert into npra_admin_coastal_bndy (objectid, shape) va lues ( obj_id, ('2 LINESTRING (' || x1 || ' ' || y1 || ', ' || x2 || ' ' || y2 || ')')); end end while; end procedure;
    8011 points created 8010 individual linestrings.

    Person who carried out this activity:

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

    (907) 271-5799 (voice)
    tvarner@blm.gov

  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?

    No user defined fields

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

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

    Complete

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

    Continuous linestring built using spatial SQL query from points contained in NPRA_Admin_Coastal_Points.


How can someone get a copy of the data set?

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

Access_Constraints:
Discretionary, contains no sensitive information - generally considered releasable.
Use_Constraints:
Any hardcopies or published datasets using this data shall clearly indicate their source.
Any users wishing to modify this data are obligated to report the extent of their modifications. User specifically agrees not to misrepresent modifications to this data, as approved or endorsed by the BLM.

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

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

    (907) 271-5799 (voice)
    tvarner@blm.gov

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

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    No warranty is made by the Bureau of Land Management as to the accuracy, reliability, or completeness of these data for individual use or aggregate use with other data.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 02-Nov-2007
Last Reviewed: 02-Nov-2007
To be reviewed: 02-Nov-2008
Metadata author:
Bureau of Land Management
Attn: Tim Varner
IT Specialist
222 W 7th Ave #13
Anchorage, AK` 99513
USA

(907) 271-5799 (voice)
tvarner@blm.gov

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


Generated by mp version 2.9.12 on Thu Mar 09 14:09:05 2017