. .

U.S. DEPARTMENT OF THE INTERIOR

BUREAU OF LAND MANAGEMENT

Oregon / Washington

GIS Metadata


BLM OR Oregon National Historic Trail Line

Frequently-asked questions:


What does this data set describe?

Title:
BLM OR Oregon National Historic Trail Line

Abstract:
oregon_historic_trail: Line coverage of the Oregon Historic Trail in the State of Oregon. Linework is derived from various sources at various scales.

Supplemental information:
Theme locally known as OHT

  1. How should this data set be cited?

    OR/WA BLM, BLM OR Oregon National Historic Trail Line: OR BLM, Portland, OR.

  2. What geographic area does the data set cover?

    Bounding coordinates:
    West: -122.594035
    East: -117.011821
    North: 45.740514
    South: 43.818766

  3. What does it look like?

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

    Calendar date: 20030516
    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?

      Indirect spatial reference:
      Oregon

      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • String (349)

    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 2e-008. Longitudes are given to the nearest 2e-008. Latitude and longitude values are specified in Decimal Degrees.

      The horizontal datum used is D North American 1983.
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?

    oregon_historic_trail_arc
    Arc attribute table (Source: OR/WA BLM)

    OBJECTID
    Internal feature number. (Source: ESRI)
                      

    Sequential unique whole numbers that are automatically generated.

    Shape
    Feature geometry. (Source: ESRI)
                      

    Coordinates defining the features.

    NHT_COORD_SOURCE
    This value refers to the actual source of the defining feature. It is the digital map source of the original arc that makes up the National Historic Trail.

    ValueDefinition
    24K DRG
    1:24,000 DRG

    NHT_DEF_FEATURE
    This value refers to the designated trail route that represents the Oregon National Historic Trail.  This value is recorded on each arc.  This field is used when coincident lines from the GTRN and the DRG's are part of the Oregon Trail.  Entries should be lowercase.

    ValueDefinition
    other
    Unknown type of road.
    trail
    trail
    US Highway
    United States Highway
    county road
    county road
    state highway
    state highway
    unknown
    No lines were coincident with the trail.

    NHT_NAME
    This value refers to the official name of the National Historic Trail.  It may contain spaces, plus a combination of upper and lowercase alpha characters.

    ValueDefinition
    Oregon National Historic Trail
    The line represents a portion of the Oregon National Historic Trail

    NHT_OFFICE
    This value refers to the administrative BLM Field Office code. For example, CA 066.

    NHT_STATE
    This value refers to the administrative State for the National Historic Trail.  This field should be the two digit uppercase code for the state.

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

    Positive real numbers that are automatically generated.

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Who produced the data set?

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

    • OR/WA BLM

  2. Who also contributed to the data set?

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

    Cathi Bailey
    Bureau of Land Management Oregon State Office
    P.O Box 2965
    Portland, OR 97208
    US

    503-808-6215 (voice)
    (503)-808-6334 (FAX)
    c1bailey@blm.gov
    Contact Instructions:
    Call or Email
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Why was the data set created?

Cartographic Display

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How was the data set created?

  1. Where did the data come from?

    GTRN (source 1 of 3)

    OR/WA BLM, unknown, Ground Transportation Roads and Trails: OR BLM, Portland, OR.

    Type of source media: hardcopyPaper
    Source scale denominator: 24000
    Source contribution:
    Lines

    DRG (source 2 of 3)

    Bureau of Land Management Oregon State Office, 20000601, 24K Digital Raster Graphics Oregon: OR BLM, Portland, OR.

    Type of source media: onLine
    Source scale denominator: 24000
    Source contribution:
    Reference

    Maps of the Oregon Trail by Gregory M. Franzwa (source 3 of 3)

    Gregory M. Franzwa, 19900101, Maps of the Oregon Trail by Gregory M. Franzwa: Patrice Press, .

    Type of source media: hardcopyPaper
    Source scale denominator: 24000
    Source contribution:
    Lines

  2. What changes have been made?

    Date: 20030101 (change 1 of 3)
    Line work was selected from the cited sources and PUT into the new OHT coverage. The DRGs were used a reference.

    Data sources used in this process:
    • Digital Raster Graphs (DRG)
    • Ground Transportation (GTRN)
    • Maps of the Oregon Trail by Gregory M. Franzwa

    Date: 20030101 (change 2 of 3)
    Attribute data for the NHT_DEF_FEATURE field was transferred from the OR/WA BLM GTRN layer.

    Data sources used in this process:
    • GTRN

    Date: 20080207 (change 3 of 3)
    Data was reprojected to Geographic NAD83 and loaded into the BLM corporate SDE instances as a stand alone feature class.

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

  1. How well have the observations been checked?

    Unknown

  2. How accurate are the geographic locations?

    Unknown

  3. How accurate are the heights or depths?

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

    Dataset is complete for the State of Oregon.

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

    Lines were Q.C.'ed by OR/WA BLM Office personnel for line accuracy. This theme was built with line topology.

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How can someone get a copy of the data set?

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

Access constraints: None
Use constraints:
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.

Distributor 1 of 1

  1. Who distributes the data set?

    Eric Hiebenthal
    Bureau of Land Management, Oregon State Office
    GIS Data Management Specialist
    P.O. Box 2965
    Portland, OR 97208
    US

    503-808-6565 (voice)
    503-808-6419 (FAX)
    ehiebent@blm.gov

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

  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?

    • Cost to order the data: Contact distributor.


    • Special instructions:

      Data are only available through the Oregon/Washington State office of the Bureau of Land Management.

  5. Is there some other way to get the data?

  6. What hardware or software do I need in order to use the data set?

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Who wrote the metadata?

Dates:
Last modified: 20030516
Last reviewed: 20110722
To be reviewed: 20130811

Metadata author:
Stanley Frazier
Bureau of Land Management, Oregon State Office
State Data Administrator
P.O. Box 2965
Portland, OR 97208
US

(503)808-6009 (direct) (503)808-6004 (front desk) (voice)
(503)808-6419 (FAX)
sfrazier@blm.gov

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata(FGDC-STD-001-1998)

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