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Major Roads of the United States

Major Roads of the United States

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

Frequently-anticipated questions:


What does this data set describe?

Title: Major Roads of the United States
Abstract:
This data set portrays the major roads in the United States, Puerto Rico, and the U.S. Virgin Islands. The file was produced by joining the individual State roads layers from the 1:2,000,000-scale Digital Line Graph (DLG) data produced by the USGS. This is a revised version of the March 1999 data set.
  1. How should this data set be cited?

    U.S. Geological Survey, 199911, Major Roads of the United States: U.S. Geological Survey, Reston, Virginia.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: 170
    East_Bounding_Coordinate: -64
    North_Bounding_Coordinate: 72
    South_Bounding_Coordinate: 17

  3. What does it look like?

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

    Beginning_Date: 1972
    Ending_Date: 1999
    Currentness_Reference: ground condition

  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 (FIPS 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 (47014)

    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?

    Road (described by Roadtrl020.dbf)
    An open way for the passage of vehicles. (Source: U.S. Geological Survey)

    Shape
    The representation of the entity in the data. (Source: U.S. Geological Survey)

    ValueDefinition
    Polyline1-dimensional element that may or may not surround a 2-dimensional element.

    Fnode_
    Internal number of the from-node. (Source: U.S. Geological Survey)

    Range of values
    Minimum:1
    Maximum:29145

    Tnode_
    Internal number of the to-node. (Source: U.S. Geological Survey)

    Range of values
    Minimum:2
    Maximum:29144

    Lpoly_
    Internal number of the polygon to the left of the arc. (Source: U.S. Geological Survey)

    Range of values
    Minimum:0
    Maximum:0

    Rpoly_
    Internal number of the polygon to the right of the arc. (Source: U.S. Geological Survey)

    Range of values
    Minimum:0
    Maximum:0

    Length
    The length of the arc in coverage units. (Source: U.S. Geological Survey)

    Range of values
    Minimum:0.000
    Maximum:8.512

    Roadtrl020
    Internal feature number. (Source: U.S. Geological Survey)

    Range of values
    Minimum:1
    Maximum:47014

    Feature
    The type of road. (Source: U.S. Geological Survey)

    ValueDefinition
    Ferry CrossingA route used to transport traffic between two points separated by water.
    Ferry Crossing Toll RoadA route used to transport traffic between two points separated by water and where a travel fee is collected.
    Limited Access HighwayA route that is part of the United States Interstate Highway System or other similar expressway.
    Limited Access Highway Alternate RouteA route that substitutes for a United States Interstate Highway or other similar expressway.
    Limited Access Highway Business RouteA route that is part of the United States Interstate Highway System or other similar expressway and that is used for commercial traffic.
    Limited Access Highway Bypass RouteA route that is part of the United States Interstate Highway System or other similar expressway, and that diverts traffic around a town.
    Limited Access Highway In TunnelA route that is part of the United States Interstate Highway System or other similar expressway, and that goes through a tunnel.
    Limited Access Highway In Tunnel Toll RoadA route that is part of the United States Interstate Highway System or other similar expressway, and that goes through a tunnel and where a travel fee is collected.
    Limited Access Highway Toll RoadA route that is part of the United States Interstate Highway System or other similar expressway, and where a travel fee is collected.
    Limited Access Highway Truck RouteA route that is part of the United States Interstate Highway System or other similar expressway, and that is designated for truck traffic.
    Other HighwayA minor State-numbered route or other connector road.
    Other Highway Alternate RouteA route that substitutes for a minor State-numbered route or other connector road.
    Other Highway Business RouteA minor State-numbered route or other connector road that is used for commercial traffic.
    Other Highway Bypass RouteA minor State-numbered route or other connector road that diverts traffic around a town.
    Other Highway Toll RoadA minor State-numbered route or other connector road where a travel fee is collected.
    Other Through HighwayA major State-numbered route or a minor United States-numbered highway.
    Other Through Highway Alternate RouteA route that substitutes for a major State-numbered route or a minor United States-numbered highway.
    Other Through Highway Alternate Route Bypass RouteA route that substitutes for a major State-numbered route or a minor United States-numbered highway, and that diverts traffic around a town.
    Other Through Highway Business RouteA major State-numbered route or a minor United States-numbered highway that is used for commercial traffic.
    Other Through Highway Business Route Alternate RouteA route that substitutes for a major State-numbered route or a minor United States-numbered highway, and that is used for commercial traffic.
    Other Through Highway Bypass RouteA major State-numbered route or a minor United States-numbered highway that diverts traffic around a town.
    Other Through Highway In Tunnel Alternate RouteA route that substitutes for a major State-numbered route or a minor United States-numbered highway, and that goes through a tunnel.
    Other Through Highway Toll RoadA major State-numbered route or a minor United States-numbered highway where a travel fee is collected.
    Other Through Highway Truck RouteA major State-numbered route or a minor United States-numbered highway that is designated for truck traffic.
    Principal HighwayA major United States-numbered highway or one of the most important State-numbered routes.
    Principal Highway Alternate RouteA route that substitutes for a major United States-numbered highway or one of the most important State-numbered routes.
    Principal Highway Alternate Route Bypass RouteA route that substitutes for a major United States-numbered highway or one of the most important State-numbered routes, and that diverts traffic around a town.
    Principal Highway Business RouteA major United States-numbered highway or one of the most important State-numbered routes that is used for commercial traffic.
    Principal Highway Business Route Alternate RouteA route that substitutes for a major United States-numbered highway or one of the most important State-numbered routes, and that is used for commercial traffic.
    Principal Highway Bypass RouteA major United States-numbered highway or one of the most important State-numbered routes that diverts traffic around a town.
    Principal Highway In TunnelA major United States-numbered highway or one of the most important State-numbered routes that goes through a tunnel.
    Principal Highway In Tunnel Toll RoadA major United States-numbered highway or one of the most important State-numbered routes that goes through a tunnel, and where a travel fee is collected.
    Principal Highway Toll RoadA major United States-numbered highway or one of the most important State-numbered routes where a travel fee is collected.
    Principal Highway Truck RouteA major United States-numbered highway or one of the most important State-numbered routes that is designated for truck traffic.

    Name
    The name of the road (Source: U.S. Geological Survey)

    There is no predefined set of valid road names.

    State_fips
    The 2-digit Federal Information Processing Standard (FIPS) code used by the U.S. Bureau of the Census, for the State or State equivalent in which the road is located. (Source: U.S. Geological Survey)

    Formal codeset
    Codeset Name:Codes for the Identification of the States, the District of Columbia and the Outlying Areas of the United States, and Associated Areas, FIPS 5-2.
    Codeset Source:U.S. Department of Commerce

    State
    The 2-letter FIPS code for the State or State equivalent in which the road is located. (Source: U.S. Geological Survey)

    Formal codeset
    Codeset Name:Codes for the Identification of the States, the District of Columbia and the Outlying Areas of the United States, and Associated Areas, FIPS 5-2.
    Codeset Source:U.S. Department of Commerce


Who produced the data set?

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

    • U.S. Geological Survey

  2. Who also contributed to the data set?

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

    Steve Kambly
    U.S. Geological Survey
    561 National Center
    Reston, VA 20192

    703-648-5094 (voice)
    skambly@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-scale data. No responsibility is assumed by the U.S. Geological Survey in the use of these data.


How was the data set created?

  1. From what previous works were the data drawn?

    2MILRD (source 1 of 4)
    U.S. Geological Survey, 1995, 1:2,000,000-scale Digital Line Graph Data - Roads: U.S. Geological Survey, Reston, VA.

    Type_of_Source_Media: CD-ROM
    Source_Scale_Denominator: 2000000
    Source_Contribution: spatial and attribute information

    ATLAS-RD98 (source 2 of 4)
    U.S. Geological Survey, 1998, Major Roads and Trails of the United States: U.S. Geological Survey, Reston, Virginia.

    Type_of_Source_Media: online
    Source_Scale_Denominator: 2000000
    Source_Contribution: spatial and attribute information

    ATLAS-RD9903 (source 3 of 4)
    U.S. Geological Survey, 199903, Major Roads and Trails of the United States: U.S. Geological Survey, Reston, Virginia.

    Type_of_Source_Media: online
    Source_Scale_Denominator: 2000000
    Source_Contribution: spatial and attribute information

    USGS_AK (source 4 of 4)
    U.S. Geological Survey, 1996, State of Alaska, Map E: U.S. Geological Survey, Reston, Virginia.

    Type_of_Source_Media: paper
    Source_Scale_Denominator: 2500000
    Source_Contribution: spatial and attribute information

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

    Date: 1998 (process 1 of 3)
    The 2MILRD data files were originally digitized by the National Mapping Division based on the sectional maps contained in 'The National Atlas of the United States of America' published by the USGS in 1970. The files were updated and the Arc/INFO software command DLGARC was used to convert the State DLG optional-format files to Arc/INFO coverages. The individual State coverages were then merged together using the Arc/INFO command APPEND.

    Data sources used in this process:

    • 2MILRD

    Data sources produced in this process:

    • ATLAS-RD98

    Date: 1999 (process 2 of 3)
    Roads for Puerto Rico and the U.S. Virgin Islands were added.

    Data sources used in this process:

    • 2MILRD
    • ATLAS-RD98

    Data sources produced in this process:

    • ATLAS-RD9903

    Date: Oct-1999 (process 3 of 3)
    Some roads in Alaska were determined to be trails, and were deleted. Some ferry crossings in Alaska were added, others modified.

    Data sources used in this process:

    • ATLAS-RD9903
    • USGS_AK

  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 data set includes roads for all 50 States, Puerto Rico, and the U.S. Virgin Islands. Data completeness generally reflects the content of the original DLG files.

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

    The data set was checked for topological consistency using the Arc/INFO command BUILD. No other checks for logical consistency were performed on this data set.


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.

  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://mapping.usgs.gov/esic/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?

    • Availability in digital form:

      Data format: ESRI Shapefile
      Network links: <http://nationalatlas.gov/atlasftp.html>

      Data format: SDTS
      Network links: <http://nationalatlas.gov/atlasftp.html>

    • Cost to order the data:

      There is no charge for the online option. For National Atlas files ordered on CD-ROM there is a base price of $45.00 per disc, a handling fee of $5.00, and a per-file charge based on file size. The charge for files less than 10 megabytes in size is $1.00. The charge for files that range in size from 10 to 150 megabytes is $7.50. The charge for files of 150 megabytes or larger is $15.00. The charge is $7.50 for the Major Roads of the United States data set.

    • Special instructions:

      To order files on CD-ROM, please see <http://nationalatlas.gov/atlasftp.html#q12>.


Who wrote the metadata?

Dates:
Last modified: 25-Sep-2001
Metadata author:
Peg Rawson
U.S. Geological Survey
521 National Center
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 2.8.16 on Wed Mar 29 16:13:39 2006