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Railroads of the United States

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

Frequently-anticipated questions:


What does this data set describe?

Title: Railroads of the United States
Abstract:
This map layer includes railroads in the conterminous United States and Alaska. This is a replacement for the December 1998 map layer.
  1. How should this data set be cited?

    National Atlas of the United States, 200509, Railroads of the United States: National Atlas of the United States, Reston, VA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -151.0
    East_Bounding_Coordinate: -67.0
    North_Bounding_Coordinate: 65.0
    South_Bounding_Coordinate: 25.0

  3. What does it look like?

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

    Calendar_Date: Sep-2005
    Currentness_Reference: Publication date

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

  6. How does the data set represent geographic features?

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

      Indirect_Spatial_Reference:
      U.S. Department of Commerce, 1987, Codes for the Identification of the States, the District of Columbia and the Outlying Areas of the United States, and Associated Areas (Federal Information Processing Standard 5-2): Washington, D.C., National Institute of Standards and Technology.

      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • Complete chain (8563)

    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 0.000278. Longitudes are given to the nearest 0.000278. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is GRS1980.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.257222.

  7. How does the data set describe geographic features?

    Railroad (described by railrdl020.dbf)
    A set of parallel rails on which a train runs. (Source: National Atlas of the United States)

    Shape
    The representation of the entity in the data. (Source: National Atlas of the United States.)

    ValueDefinition
    PolyLine2-dimensional element

    Fnode_
    Internal sequence number of the from-node. (Source: National Atlas of the United States)

    Range of values
    Minimum:1
    Maximum:6454

    Tnode_
    Internal sequence number of the to-node. (Source: National Atlas of the United States)

    Range of values
    Minimum:2
    Maximum:6454

    Length
    Length of the arc in coverage units. (Source: National Atlas of the United States)

    Range of values
    Minimum:0.000
    Maximum:7.351

    Railrdl020
    Internal sequence number. (Source: National Atlas of the United States)

    Range of values
    Minimum:1
    Maximum:8563

    Rrowner1
    The name of the railroad that owns the track. Tracks may be owned by more than one railroad, in which case this is the name of the largest railroad that owns the track. (Source: National Atlas of the United States)

    There is no predefined set of valid railroad names.

    Rrowner2
    The name of the second-largest railroad that owns the track, if any. (Source: National Atlas of the United States)

    ValueDefinition
    <blank>The track is owned by only one railroad.

    There is no predefined set of valid railroad names.

    Rrowner3
    The name of the third-largest railroad that owns the track, if any. (Source: National Atlas of the United States)

    ValueDefinition
    <blank>The track is owned by one or two railroads.

    There is no predefined set of valid railroad names.

    Mark1
    The reporting mark of the railroad that owns the track. Tracks may be owned by more than one railroad, in which case this is the reporting mark of the largest railroad that owns the track. (Source: National Atlas of the United States)

    Formal codeset
    Codeset Name:Rule 260 and Railroad Owner Codes
    Codeset Source:Federal Railroad Administration

    Mark2
    The reporting mark of the second-largest railroad that owns the track, if any. (Source: National Atlas of the United States)

    ValueDefinition
    <blank>The track is owned by only one railroad.

    Formal codeset
    Codeset Name:Rule 260 and Railroad Owner Codes
    Codeset Source:Federal Railroad Administration

    Mark3
    The reporting mark name of the third-largest railroad that owns the track, if any. (Source: National Atlas of the United States)

    ValueDefinition
    <blank>The track is owned by one or two railroads.

    Formal codeset
    Codeset Name:Rule 260 and Railroad Owner Codes
    Codeset Source:Federal Railroad Administration


Who produced the data set?

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

    • National Atlas of the United States

  2. Who also contributed to the data set?

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

    Woodley Chu
    National Atlas of the United States
    12201 Sunrise Valley Dr
    Reston, VA 20192

    703-648-6375 (voice)
    atlasmail@usgs.gov


Why was the data set created?

These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:2,000,000 data. No responsibility is assumed by the National Atlas of the United States in the use of these data.


How was the data set created?

  1. From what previous works were the data drawn?

    NRN (source 1 of 7)
    Administration, Federal Railroad , 2003, National Rail Network 1:2,000,000: Bureau of Transportation Statistics, Washington, DC.

    Type_of_Source_Media: CD-ROM
    Source_Contribution: Spatial and attribute information

    AAR (source 2 of 7)
    RailServe.com, 2003, AAR Railroad Reporting Marks: RailServe.com, Morrisville, PA.

    Online Links:

    Type_of_Source_Media: Online
    Source_Contribution: Attribute information

    DP (source 3 of 7)
    Depot, Railroad, 2003, Railroad Depot.

    Online Links:

    Type_of_Source_Media: Online
    Source_Contribution: Attribute information

    TC (source 4 of 7)
    TrainsCan, 2003, Reporting Marks.

    Online Links:

    Type_of_Source_Media: Online
    Source_Contribution: Attribute information

    PW (source 5 of 7)
    Piedmont and Western Railroad Club, 2003, Association of American Railroads Reporting Marks: Piedmont and Western Railroad Club, Valdese, NC.

    Online Links:

    Type_of_Source_Media: Online
    Source_Contribution: Attribute information

    NRHS (source 6 of 7)
    National Railway Historical Society, 2001, NRHS Reporting Marks Database: National Railway Historical Society, Philadelphia, PA.

    Online Links:

    Type_of_Source_Media: Online
    Source_Contribution: Attribute information

    Atlas_States (source 7 of 7)
    National Atlas of the United States, 200206, State Boundaries of the United States: National Atlas of the United States, Reston, VA.

    Online Links:

    Type_of_Source_Media: Online
    Source_Scale_Denominator: 2000000
    Source_Contribution: Spatial information

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

    Date: Aug-2004 (process 1 of 1)
    The NRN data were loaded into Arc/INFO and the list of attributes was edited to include a maximum of three railroad owner names and their corresponding reporting marks. Additional railroad owner names were obtained from the AAR, DP, TC, and PW sources. The sources DP and NRHS were used to identify abandoned railroads and rail lines no longer in existence, which were then deleted. The attributes were reorganized, so that for tracks with multiple owners, the largest railroad is listed as Rrowner1, with the next smaller railroad listed as Rrowner2, and the smallest of the three railroads, if any, listed as Rrowner3. Some tracks were adjusted inland from open water using Atlas_States as a guide. Tracks were generalized, particularly in congested areas, and merged where they run closely parallel to one another. The file was saved as a Shapefile.

    Data sources used in this process:

    • NRN
    • AAR
    • DP
    • TC
    • PW
    • NRHS
    • Atlas_States

  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?

  3. How accurate are the heights or depths?

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

    This map layer includes railroads in the conterminous United States and Alaska.

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

    The Arc/INFO commands BUILD and CLEAN were run to ensure the topological consistency of the map layer.


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:
None. Acknowledgment of the National Atlas of the United States of America would be appreciated in products derived from these data.

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

    Earth Science Information Center, U.S. Geological Survey
    507 National Center
    Reston, VA 20192

    1-888-ASK-USGS (1-888-275-8747) (voice)

    Contact_Instructions:
    In addition to the address above there are other ESIC offices throughout the country. A full list of these offices is at <http://ask.usgs.gov/esic_index.html>.
  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the U.S. Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the U.S. Geological Survey in the use of these data.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 30-May-2006
Metadata author:
Peg Rawson
National Atlas of the United States
12201 Sunrise Valley Dr
Reston, VA 20192

703-648-4183 (voice)
atlasmail@usgs.gov

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



 


Generated by mp version 2.9.1 on Mon Aug 21 14:55:50 2006