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  <titleInfo>
    <title>Global Map: 1:1,000,000-Scale Major Roads of the United States, 2014</title>
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  <abstract displayLabel="Abstract" lang="eng">This map layer 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 National Highway Planning Network (NHPN), Geographic Data Technology (GDT) Dynamap, and TIGER/Line files. This is a revised version of the July 2012 map layer. This layer is part of the 1997-2014 edition of the National Atlas of the United States.</abstract>
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  <note displayLabel="Preferred citation" lang="eng">National Atlas of the United States. (2014). Global Map: 1:1,000,000-Scale Major Roads of the United States, 2014. National Atlas of the United States. Available at: http://purl.stanford.edu/mj608zg0275.</note>
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Global Map: 1:1,000,000-Scale Major Roads of the United States, 2014

Identification Information

Citation
Title
Global Map: 1:1,000,000-Scale Major Roads of the United States, 2014
Originator
National Atlas of the United States
Publisher
National Atlas of the United States
Publication Date
2014-03-01
Identifier
http://purl.stanford.edu/mj608zg0275
Geospatial Data Presentation Form
mapDigital
Collection Title
National Atlas of the United States of America, 1997-2014
Other Citation Details
These data were downloaded from the National Atlas website (http://www.nationalatlas.gov/atlasftp.html) in August 2014.
Abstract
This map layer 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 National Highway Planning Network (NHPN), Geographic Data Technology (GDT) Dynamap, and TIGER/Line files. This is a revised version of the July 2012 map layer. This layer is part of the 1997-2014 edition of the National Atlas of the United States.
Purpose
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 1:1,000,000-scale data. No responsibility is assumed by the National Atlas of the United States in the use of these data.
Temporal Extent
Currentness Reference
Publication date
Time Instant
2014-03-01
Bounding Box
West
-176
East
-64
North
71
South
17
Bounding Box
West
-176.76295
East
-64.593012
North
71.310968
South
17.688763
ISO Topic Category
transportation
Place Keyword
United States
Alabama
Arizona
Arkansas
Colorado
Connecticut
Delaware
Florida
Georgia
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York (State)
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington (D.C.)
Washington (State)
West Virginia
Wisconsin
Wyoming
United States Virgin Islands
Puerto Rico
Place Keyword Thesaurus
geonames
Theme Keyword
Roads
Highways
Theme Keyword Thesaurus
lcsh
Legal Constraints
Use Limitation
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.
Status
completed
Maintenance and Update Frequency
irregular
Collection
Collection Title
National Atlas of the United States of America, 1997-2014
URL
http://purl.stanford.edu/cv275yx9215
Language
eng
Credit
National Atlas of the United States. (2014). Global Map: 1:1,000,000-Scale Major Roads of the United States, 2014. National Atlas of the United States. Available at: http://purl.stanford.edu/mj608zg0275.
Point of Contact
Contact
National Atlas of the United States
Delivery Point
12201 Sunrise Valley Drive
City
Reston
Administrative Area
VA
Postal Code
20192
Email
atlasmail@usgs.gov
Phone
1-888-ASK-USGS (1-888-275-8747)

Spatial Reference Information

Reference System Identifier
Code
4269
Code Space
EPSG
Version
8.6.2

Data Quality Information

Lineage
Process Step
Description
Roads consisting of Interstates, U.S. routes, and State routes were collected from NHPN and GDT Dynamap. In areas with a sparse road network, some roads deemed major were collected from NHPN. Roads for Puerto Rico and the U.S. Virgin Islands were collected from 2006 2nd Edition TIGER/Line files.
Process Date
2008-01-01T00:00:00
Process Step
Description
The data were converted to an Albers Equal Area projection. Attribute fields for miles and kilometers were added, and the values were calculated using ArcGIS. The data were then converted back to geographic coordinates. Adjustments were made to the roads attribution to clarify descriptive information and to correct errors.
Process Date
2012-01-01T00:00:00
Process Step
Description
All the 1:1,000,000-scale map layers were checked for vertical integration. Line positions were adjusted as necessary to remove overlaps. Wherever possible, linear features were separated by 300 meters, but were kept within 500 meters of their true location.
Process Date
2012-01-01T00:00:00
Process Step
Description
The map layer was saved in shapefile and in file geodatabase formats.
Process Date
2013-01-01T00:00:00
Process Step
Description
Where road segments less than 0.1 KM in length were adjacent to longer segments with the same attributes, the segments were joined. All remaining roads less than 0.1 KM in length were evaluated and were either joined to neighboring segments, or their length was adjusted to greater than 0.1 KM. The data were converted to an Albers Equal Area projection, values for miles and kilometers were calculated using ArcGIS, and the data were converted back to geographic coordinates. There were several roads that needed a directional prefix added; the prefixes were obtained from the TIGER and NTAD sources.
Process Date
2013-01-01T00:00:00
Process Step
Description
Data along the Canadian border were adjusted so that the Canadian and USA 1:1,000,000-scale data sets can be used together as seamlessly as possible. Problem areas were identified by Natural Resources Canada (NRCan) and edits to the USA data were performed by the USGS. To identify problems, the National Atlas 1M roads 2012 data set was projected to the NRCan working coordinate system, which is a Lambert Conformal Conic projection with standard parallels of 49 and 77 degrees, datum of NAD83, an XY tolerance of 0.001 meters, and an XY resolution of 0.0001 meters. The Canadian and US data sets were displayed together and features were compared across the border. An initial set of comments and suggestions for edits were sent to the USGS by NRCan. NRCan used satellite imagery for reference during the editing process by converting the appropriate National Atlas 1:1,000,000-scale map layers and the 250K Canadian topo data to KML and loading the KMLs into GoogleEarth. Using the cursor coordinates in the ArcMap status bar, NRCan visually navigated and correlated the ArcMap and GoogleEarth vectors. NRCan exported their findings and sent them to the USGS for correction and (or) further comment. USGS reviewed the Canadian findings and returned the data to NRCan with comments. The U.S. data were either edited, not edited and further explanation was requested, or not edited and changes were suggested to for the Canadian data. This process was repeated until both NRCan and USGS felt that the data were satisfactorily harmonized.
Process Date
2013-01-01T00:00:00
Process Step
Description
Roads in the Virgin Islands that were previously identified as State routes were reattributed as VI routes. Because there is a separate Ferries data set available from the National Atlas, ferries were deleted from this data set.
Process Date
2013-01-01T00:00:00
Process Step
Description
Roads along the Mexican border were aligned based on reference to ESRI Basemaps, Google Maps, and Bing Maps.
Process Date
2013-01-01T00:00:00
Source
Title
National Topographic System Maps (1:250 000)
Originator
Government of Canada, Natural Resources Canada, Mapping Information Branch
Publisher
Government of Canada
Description
  Positional reference 
Source
Title
1:1,000,000-Scale Roads of the United States
Publication Date
2012-07-01
Originator
National Atlas of the United States
Publisher
National Atlas of the United States
Description
Spatial and attribute information
Source
Title
Google Maps
Originator
Google
Description
Spatial information.
Source
Title
1:1,000,000-Scale National Atlas map layers and other quality control files
Originator
National Atlas of the United States
Description
Spatial information
Source
Title
GDT Dynamap/1000 v 6.8
Publication Date
2000-01-01
Originator
Geographic Data Technology, Inc.
Publisher
Geographic Data Technology, Inc.
Description
Spatial and attribute information
Source
Title
ESRI Basemaps
Originator
Environmental Systems Research Institute - ESRI
Description
Spatial information.
Source
Title
NTAD 2007 - National Transportation Atlas Database 2007
Publication Date
2007-01-01
Originator
U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics.
Publisher
U.S. Department of Transportation
Description
Attribute information
Source
Title
Bing Maps
Originator
Environmental Systems Research Institute - ESRI
Description
Spatial information.
Source
Title
2006 Second Edition TIGER/Line Files - Roads
Publication Date
2006-01-01
Originator
Department of Commerce, Census Bureau, Geography Division
Publisher
Department of Commerce, Census Bureau, Geography Division
Description
Spatial and attribute information
Source
Title
National Highway Planning Network (NHPN) v2005.08 (Line)
Publication Date
2007-01-01
Originator
U.S. Department of Transportation
Publisher
Federal Highway Administration (FHWA)
Description
Spatial and attribute information
Source
Title
Atlas of Canada National Scale Data 1:1,000,000 - Roads
Publication Date
2013-11-08
Originator
Government of Canada, Natural Resources Canada, Mapping Information Branch
Publisher
Government of Canada
Description
Spatial information

Distribution Information

Format Name
Shapefile
Distributor
Earth Explorer, U.S. Geological Survey
Online Access
http://purl.stanford.edu/mj608zg0275
Protocol
http
Name
roadtrl010g.shp

Content Information

Feature Catalog Description
Compliance Code
false
Language
eng
Included With Dataset
true
Feature Catalog Citation
Title
Feature catalog for Global Map: 1:1,000,000-Scale Major Roads of the United States, 2014
Feature Catalog Identifier
af245227-f0ee-4b39-843a-b942a5292721

Spatial Representation Information

Vector
Topology Level
geometryOnly
Vector Object Type
composite
Vector Object Count
225838

Metadata Reference Information

Hierarchy Level
dataset
Metadata File Identifier
edu.stanford.purl:mj608zg0275
Parent Identifier
http://purl.stanford.edu/cv275yx9215.mods
Dataset URI
http://purl.stanford.edu/mj608zg0275
Metadata Date Stamp
2014-03-31
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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