rail_2m

Frequently-asked questions:


What does this data set describe?

Title:
rail_2m

Abstract:
This data set includes only the railroads in the south central and the eastern half of the US.  NBII-SAIN (ed.) created this file by clipping from from USGS railrdl020.shp.  NBII-SAIN website:  (http://sain.nbii.gov/).

Supplemental information:
Original dataset (railrdl020.shp) was downloaded from http://nationalatlas.gov/atlasftp.html.

  1. How should this data set be cited?

    REQUIRED: The name of an organization or individual that developed the data set., REQUIRED: The date when the data set is published or otherwise made available for release., rail_2m.

    Online links:

  2. What geographic area does the data set cover?

    Bounding coordinates:
    West: -109.048004
    East: -67.428264
    North: 49.000625
    South: 25.468560

  3. What does it look like?

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

    Calendar date: 1998
    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 (7006)

    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 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.

      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?

    GISDATA.rail_2m
    OBJECTID
    Internal feature number.
    (Source:
    ESRI
    )

    Sequential unique whole numbers that are automatically generated.

    FNODE_
    TNODE_
    LPOLY_
    RPOLY_
    LENGTH
    RAILRDL020
    RAILRDL021
    FEATURE
    NAME
    STATE
    STATE_FIPS
    SHAPE
    Feature geometry.
    (Source:
    ESRI
    )

    Coordinates defining the features.

    SHAPE.LEN
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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)


  2. Who also contributed to the data set?

    U.S. Geological Survey, NBII-SAIN

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

    Steve Kambly
    US Geological Survey
    561 National Center
    Reston, VA 20192
    USA

    703-648-5094 (voice)
    skambly@usgs.gov
    Contact Instructions:
    This is the contact person for the parent data set (railrdl020.shp) which was obtained from http://nationalatlas.gov/atlasftp.html.
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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 U.S. Geological Survey in the use of these data.

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How was the data set created?

  1. Where did the data come from?

  2. What changes have been made?

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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 data set includes only the railroads in the south central and the eastern half of the US.  NBII-SAIN (ed.) created this file by clipping from from USGS railrdl020.shp.  NBII-SAIN website:  (http://sain.nbii.gov/).  Data completeness generally reflects the content of the original 1:2,000,000-scale DLG file.

  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 data set.

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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:
None.  Acknowledgment of the National Atlas of the United States of America and (or) the U.S. Geological Survey would be appreciated in products derived from these data.

Distributor 1 of 1

  1. Who distributes the data set?

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

    Downloadable Data

  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?

  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: 20030508

Metadata author:
PJ Nabors-Jake Cseke
NBII-Southern Appalachian Information Node
314 Conference Center Building
Knoxville, TN 37996
USA

(865) 974-9218 (voice)
pjnabors@utk.edu
Hours of Service: 9am-5pm
Contact Instructions:
http://sain.nbii.gov

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

Metadata extensions used:
  • http://www.esri.com/metadata/esriprof80.html

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