Alaska Coastline 1:250,000

Metadata also available as - [Outline] - [Parseable text] - [SGML] - [DIF]

Frequently-anticipated questions:

What does this data set describe?

Title: Alaska Coastline 1:250,000
Abstract:
This coastline coverage of Alaska represents a collective effort by many organizations over the course of the last 15 years. It began as a digital pen-up-pen-down file from the Department of Natural Resources Division of Oil & Gas and was generated into an ARC coverage by the North Slope Borough. At that point several agencies -- spearheaded by NOAA -- cooperated to have the remainder of the coastline digitized at the scale of 1:250000. Ninety percent of the features in the coverage are very close to the Alaska coastline because NOAA had no interest in covering the whole state with stream and lake information at the original time of data capture.

Our version of the Alaska coastline originated with the North Slope Borough who gave this coverage to EROS on 3-7-89. At EROS many edits and improvements were made to the coastline coverage. The State of Alaska Department of Natural Resources received this edited coverage from EROS on 7-29-92 and has continued to make cartographic improvements to the coverage.

Supplemental_Information:
Revisions: Among the most notable corrections made by DNR: 1) placement of the Copper River (July 1992) 2) coding changes for Baird Inlet -- Selawik Lake (July 1993) 3) deletion of extraneous islands in the Aleutians 4) repositioning US/Canadian border to 141 degrees west longitude (January 1994) 5) coding changes for Walapka Bay (February 1994) 6) coding changes for Selawik Lake and coastline near Wainwright (June July August 1994)

4/19/95 K Zeiner Replaced the Canadian border in southeast with the border from the TWPSPOLY.

5/4/95 K Zeiner Added an island to the coastline per Dorothy Mortenson. Buldir Island--located in the Aleutian chain.

Related_Spatial_and_Tabular_Data_Sets: LUT: ALASKA.AFRQ FREQUENCY CODE LENGTH DESC CODEC 1 4370 50.200 65157860.000 COASTLINE C 2 213 50.202 121971.300 CLOSURE LINE CL 3 2509 50.412 18472760.000 STREAM S 4 1178 50.421 10741410.000 LAKE L 5 45 90.197 2180206.000 CANADIAN BORDER CB

Notes: Projection: Albers Date Received: 7/28/92 Verified: J. Tam 7/29/92 Documented by: J. Tam 7/29/92 This coverage has a fuzzy tolerance of 0.100. Cleaned up labelerrors; deleted incorrect Copper River - 7/31/92 Changed codec for Baird Inlet from S to C so it will draw on our base maps - J. Tam - 7/14/93 Coverage converted from pre-7.0 to Arc/Info 8.x to recover projection file. Work performed by D. Seamount. 4/18/2003.

  1. How should this data set be cited?

    Alaska Department of Natural Re, Land Records Information Section, 1984, Alaska Coastline 1:250,000: physical_feature alaska_250000_py, ADNR, LRIS, Anchorage, AK.

    Online Links:

    • Server=rex.dnr.state.ak.us; Service=5152; User=gis_base; Version=SDE.DEFAULT

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -179.914419
    East_Bounding_Coordinate: 179.937949
    North_Bounding_Coordinate: 72.030119
    South_Bounding_Coordinate: 48.159364

  3. What does it look like?

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

    Beginning_Date: 1950
    Ending_Date: 1980
    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):

      • G-polygon (811)

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

      The map projection used is Albers Conical Equal Area.

      Projection parameters:
      Standard_Parallel: 55.000000
      Standard_Parallel: 65.000000
      Longitude_of_Central_Meridian: -154.000000
      Latitude_of_Projection_Origin: 50.000000
      False_Easting: 0.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.010000
      Ordinates (y-coordinates) are specified to the nearest 0.010000
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.

      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:
      Altitude_Resolution: 1.000000
      Altitude_Encoding_Method:
      Explicit elevation coordinate included with horizontal coordinates

  7. How does the data set describe geographic features?

    GIS_BASE.alaska_1mil_py

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    CODE

    SHAPE_Leng

    SHAPE_Area
    Area of feature in internal units squared. (Source: ESRI)

    Positive real numbers that are automatically generated.

    Entity_and_Attribute_Overview: Coded for cartographic purposes.
    Entity_and_Attribute_Detail_Citation: none

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?

    NOAA, USGS/EROS, ADNR-DOG, North Slope Borough

  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
    USA

    907 269 8833 (voice)
    907 269 8920 (FAX)
    gis_public_access@dnr.state.ak.us

    Hours_of_Service: 800-1600 AST
    Contact_Instructions: See Distribution_Information

Why was the data set created?

For typical GIS purposes of a general coastline. Do not use for navigation.

How was the data set created?

  1. From what previous works were the data drawn?

    none (source 1 of 1)
    USGS, 1950-1980, QMQ hydrography: DLG hydrography, USGS, Reston, Virginia.

    Type_of_Source_Media: web
    Source_Scale_Denominator: 250000
    Source_Contribution:
    Selected coastline information where needed and where available. Also used other sources. See Abstract.

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

    Date: 1984 (process 1 of 7)
    See Abstract and Supplemental_Information

    Date: Unknown (process 2 of 7)
    Coverage alaska imported into geodatabase.

    Person who carried out this activity:

    Marty Martin
    ADNR
    GIS Data Administrator
    550 W. 7th Suite 706
    Anchorage, AK 99501
    USA

    907 269 8837 (voice)
    907 269 8920 (FAX)
    marty_martin@dnr.state.ak.us

    Hours_of_Service: 0800-1600
    (process 3 of 7)
    Dataset copied.

    Data sources used in this process:

    • Server=rex.dnr.state.ak.us; Service=5152; User=gis_base; Version=SDE.DEFAULT

    (process 4 of 7)
    Dataset copied.

    Data sources used in this process:

    • \\kodiak\gis\projects\gis_base\prod9i\backup\20061214.mdb

    (process 5 of 7)
    Dataset copied.

    Data sources used in this process:

    • \\kodiak\gis\projects\gis_base\common\feature_datasets\albers_nad27.mdb

    (process 6 of 7)
    Dataset copied.

    Data sources used in this process:

    • Server=tee.dnr.state.ak.us; Service=5155; User=gis_base; Version=SDE.DEFAULT

    (process 7 of 7)
    Dataset moved.

    Data sources used in this process:

    • Y:\nssi\nssi_shapefiles\alaska_250000_py

  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?

    See Supplemental_Information: Revisions:

  2. How accurate are the geographic locations?

    See Supplemental_Information: Revisions:

  3. How accurate are the heights or depths?

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

    See Supplemental_Information: Revisions:

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

    Polygon and chain-node topology present.

How can someone get a copy of the data set?

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

Access_Constraints:
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.
Use_Constraints:
It is not recommended the data be used at a scale larger than 1:250,000.

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
    USA

    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?

Dates:
Last modified: 16-Apr-2004
Metadata author:
Alaska Department of Natural Resources - Land Records Information Section
c/o Marty Martin
GIS Data Administrator
550 W 7th Ave., Suite 706
Anchorage, AK 99501

907 269 8837 (voice)
marty_martin@dnr.state.ak.us

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

Generated by mp version 2.9.6 on Thu May 8 10:19:12 2008