Alaska Coastline 1 to 63,360

Metadata also available as

Frequently anticipated questions:


What does this data set describe?

Title: Alaska Coastline 1 to 63,360
Abstract:
This is a first cut at a statewide 1:63,360 coastline. The entire coasline, however, is not 1:63.360; only where data was available as of January 1998. It is a mixture of sources ranging from the Department of Natural Resources, Land Records Information Section hydrography database to the Exxon Valdez Oil Spill Environmentally Sensitive Index coastline (no ESI attributes included) to the US Geologic Survey hydrography to US Forest Service (in Prince William Sound). Where the 1:63,360 data was unavailable the 1:250,000 coastline was used to fill in.
This information does not include lakes or streams. All streams are cut off at the mouth with a straight line.
  1. How should this data set be cited?

    AK Department of Natural Resources, Land Records Information Section, 19980211, Alaska Coastline 1 to 63,360: PHYSICAL coast63, ADNR, LRIS, Anchorage, AK.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: 157.55125214
    East_Bounding_Coordinate: -117.38252248
    North_Bounding_Coordinate: 67.56587136
    South_Bounding_Coordinate: 49.12879913

  3. What does it look like?

    \\Ilmakso6na1\gis_data\Published\State_of_Alaska\DNR\Physical\Alaska Coastline 1 to 63360 poly Browse Graphic.png (PNG)
    Alaska Coastline 1 to 63360 poly Browse Graphic

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

    Calendar_Date: 1997
    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):

      • Point (36614)
      • String (64221)
      • GT-polygon composed of chains (36614)
      • Point (5000)

    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 0.000002. Longitudes are given to the nearest 0.000002. 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.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?

    COAST63.AAT
    arc attributes (Source: ARC/INFO)

    SOURCE
    Source where the feature came from (Source: From the metadata or map)

    Varies on name of source

    SCALE
    Scale of the source where the feature came from (Source: From the metadata or map)

    ValueDefinition
    63360, 250000 or other.scale denominator of source

    Coordinates defining the features.

    SOURCE_DATE
    Date of the source where the feature came from (Source: From the metadata or map)

    Varies on date of source

    NAME
    Name of feature (Source: From hardcopy map)

    Varies on location

    WATER_TYPE
    Type of feature (Source: ADNR, LRIS)

    ValueDefinition
    S - shore; N - null; U - usa/canada bordersee above

    Whole numbers that are automatically generated.

    RPOLY#
    Internal node number for the right polygon. (Source: ESRI)

    Whole numbers that are automatically generated.

    LENGTH
    Length of feature in internal units. (Source: ESRI)

    Positive real numbers that are automatically generated.

    COAST63#
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    COAST63-ID
    User-defined feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    coast63.pat
    Outer perimeter of coastline (Source: DNR, LRIS hydrography)

    FID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

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

    Positive real numbers that are automatically generated.

    PERIMETER
    Perimeter of feature in internal units. (Source: ESRI)

    Positive real numbers that are automatically generated.

    COAST63#
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    COAST63-ID
    User-defined feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    FEATURE
    User-defined feature number. (Source: ADNR, LRIS)

    Alaska DNR did not fill out this portiion of the metadata.

    Entity_and_Attribute_Overview:
    Attributes were added to keep track of the source of the feature and to provide other geographic information.
    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?

    Alaska Department of Natural Resource, Land Records Information Section US Geologic Survey US Forest Service, Chugach US Forest Service, Tongass EVOS Trustee Council

  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?

The purpose of this information is to provide a better coastline for land data to be clipped. It's purpose is cartographic. Before this was created, land data was clipped to a 1:250,000 statewide coastline which did not include many of the islands and did not match well with the 1:63,360 hydrography. Attributes have been added to the arcs, but have not been checked carefully.
This coverage is the first of its kind at this scale; thus there are errors. Please notify DNR, LRIS so these may be corrected.
Note: The USGS is in the process of automating the hydrography statewide at 1:63,360 and should be used as a replacement when the information is ready. This hydrography was not complete and available as of January 1998, and no specific date was set.


How was the data set created?

  1. From what previous works were the data drawn?

    none (source 1 of 4)
    Alaska Department of Natural Resources, Land Records Information Section, 1990, ITM hydrography: ITM hydrography data hydro, ADNR, LRIS, Anchorage, AK.

    Type_of_Source_Media: online
    Source_Scale_Denominator: 63360
    Source_Contribution:
    Source used USGS 1:63,360 topographic maps ranging in date from 1950's to 1990's. These were photo revised by BLM. Only hydrography meeting the needs of the State Status Plats were automated. Arc features were coded with source and water type. US Forest Service, Tongass hydrography data was integrated into datbase to fit DNR's model.

    none (source 2 of 4)
    USGS, 1950-1990, ITM hydrography: DLG hydrography, USGS, Reston, Virginia.

    Type_of_Source_Media: web
    Source_Scale_Denominator: 63360
    Source_Contribution:
    Selected coastline information where needed and where available.

    none (source 3 of 4)
    USFS, Chugach, 1996, Chugach National Forest coastline: USFS, Anchorage, AK.

    Type_of_Source_Media: magnetic tape
    Source_Scale_Denominator: 63360
    Source_Contribution:
    Chugach National Forest has had significant changes in their shoreline, particularly near Columbia Glacier and Copper River Delta. They have generated a new coastline to reflect these changes. This information was selected and added as the best source for Prince William Sound.

    none (source 4 of 4)
    EVOS Habitat/Restoration and ADNR, 1996, EVOS Research and Restoration CD-ROM: State Coastline coastst, ADNR, Anchorage, AK.

    Type_of_Source_Media: CD-ROM
    Source_Scale_Denominator: 63360
    Source_Contribution: Was used to fill in missing areas of data.

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

    Date: 01-Jan-1998 (process 1 of 2)
    From the DNR, LRIS hydrogrpahy, the arcs were selected where water-type = 'S' for shoreline or 'N' for null (closing mouth of streams). This information was used first as it had the most logical coding for arc attributes. The USGS information was downloaded from the web where holes existed. EVOS was used to fill in also. USFS, Chugach was used to completely replace the Prince William Sound area. The statewide 1:250000 alaska coastline was used to fill in where no other data was available. Attributes are structured the same as the ADNR, LRIS hydrography and were added. The attributes were not qc'ed and has errors.

    Date: 11-Jul-2006 (process 2 of 2)
    Step 1: Data set was unprojected to geographic coordinates converted from North American Datum 1927 (NAD27) to North American Datum 1983 (NAD83) using the Arcinfo workstation "PROJECT" command with the NADCON operator. Step 2: Used the Arcinfo "BUILD" command to build the coverage as a Polygon. Step 3: Buillt a spatial index on the polygons and arcs using ArcCatalog and indexed fields that may be queried.

    Person who carried out this activity:

    Greg Barrett
    Bureau of Land Management
    Cartographer
    222 W. 7th Ave., #13
    Anchorage, AK 99513
    USA

    907 271-3360 (voice)
    907 271-3118 (FAX)
    gbarrett@blm.gov

    Hours_of_Service: 9:30 - 6:00 AKST
  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?

    null (used to close mouth of rivers), and the Canadian border. Since a mix of sources were used, this was not always calculated. No QC was done to check accuracy. Will be corrected as problems arrise or more time is allowed.

  2. How accurate are the geographic locations?

    Information was cleanup on the screen. Polygons were closed, dangles deleted, and information edgematched.

  3. How accurate are the heights or depths?

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

    DNR, LRIS - reselected the hydrography features coded WATER_TYPE = 'S' or 'N' Did some clean up. EVOS - selected and added as need to fill in. USGS - downloaded ITM quads, where needed to fill in. Selected coastline arcs and closing arcs. USFS, Chugach - selected Prince William Sound coastline and filled in. USFS, Tongass - was included into DNR, LRIS hydrography database.
    There are attribute errors. Polygons all closed.

  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 1:63,360.
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: 10-Jan-2005
Metadata author:
Alaska Department of Natural Resources - Land Records Information Section
Attn: 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 2.9.12 on Thu Mar 09 14:08:07 2017