TIGER/Line Shapefile, 2015, nation, U.S., Primary Roads National Shapefile

Dataset Identification:

Resource Abstract:
The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). The MTDB represents a seamless national file with no overlaps or gaps between parts, however, each TIGER/Line shapefile is designed to stand alone as an independent data set, or they can be combined to cover the entire nation. Primary roads are generally divided, limited-access highways within the interstate highway system or under State management, and are distinguished by the presence of interchanges. These highways are accessible by ramps and may include some toll highways. The MAF/TIGER Feature Classification Code (MTFCC) is S1100 for primary roads.
Citation
Title TIGER/Line Shapefile, 2015, nation, U.S., Primary Roads National Shapefile
alternateTitle  National Geospatial Data Asset (NGDA) Primary Roads
publication  Date   2015
Edition 2015
Topic Category:  transportation
Keywords:
Theme keywords ( theme ):
Transportation Theme
NGDA Portfolio Themes
NGDA
National Geospatial Data Asset
thesaurus name >
Title NGDA Portfolio Themes
revision  Date   2010-02-01
other Citation Details  http://www.fgdc.gov/initiatives/resources/2013-2-1-ngda-data-themes-fgdc-sc-revised.pdf
Theme keywords ( theme ):
Nation
Linear
Feature
Address Range
Street Centerline
Road Feature
Roads
thesaurus name >
Title None
Location keywords:
United States
U.S.
thesaurus name >
Title ANSI INCITS 38:2009 (Formerly FIPS 5-2), ANSI INCITS 31:2009 (Formerly FIPS 6-4),ANSI INCITS 454:2009 (Formerly FIPS 8-6), ANSI INCITS 455:2009(Formerly FIPS 9-1), ANSI INCITS 446:2008 (Geographic Names Information System (GNIS))
purpose:
In order for others to use the information in the Census MAF/TIGER database in a geographic information system (GIS) or for other geographic applications, the Census Bureau releases to the public extracts of the database in the form of TIGER/Line Shapefiles.
Browse image (thumbnail):
thumbnail file name:  ...
file type: URL for a web mapping service
thumbnail file description:  URL for the TigerWeb Web Mapping Service
Resource language:  eng
Character set encoding of resource:  utf8
Resource progress code:  completed
Resource Maintenance Information
maintenance or update frequency:  notPlanned
Constraints on resource usage:
Legal Constraints
Access Constraints  otherRestrictions
use constraint:  otherRestrictions
Other constraints
Access Constraints: None
Other constraints
Use Constraints:The TIGER/Line Shapefile products are not copyrighted however TIGER/Line and Census TIGER are registered trademarks of the U.S. Census Bureau. These products are free to use in a product or publication, however acknowledgment must be given to the U.S. Census Bureau as the source. The horizontal spatial accuracy information present in these files is provided for the purposes of statistical analysis and census operations only. No warranty, expressed or implied is made with regard to the accuracy of the spatial accuracy, and no liability is assumed by the U.S. Government in general or the U.S. Census Bureau, specifically as to the spatial or attribute accuracy of the data. The TIGER/Line Shapefiles may not be suitable for high-precision measurement applications such as engineering problems, property transfers, or other uses that might require highly accurate measurements of the earth's surface. Coordinates in the TIGER/Line shapefiles have six implied decimal places, but the positional accuracy of these coordinates is not as great as the six decimal places suggest.
Spatial representation type code:  vector
Processing environment:  The TIGER/Line shapefiles contain geographic data only and do not include display mapping software or statistical data. For information on how to use the TIGER/Line shapefile data with specific software package users shall contact the company that produced the software.
Resource extent
Geographic Extent
Geographic Bounding Box
westBoundLongitude  -179.231086
eastBoundLongitude  179.859681
northBoundLatitude  71.441059
southBoundLatitude  -14.601813
Temporal Extent
Publication Date 2014-06 2015-05
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Vector spatial representation information

Geometric Objects
geometric Object Type  curve
geometric Object Count  12396
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Content information: feature catalog description

Included With Dataset  true
Feature Types   Primary Roads
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Reference system information

Reference System Identifier
Identifier string: 
Identifier code space:  Federal Information Processing Series (FIPS), Geographic Names Information System (GNIS), and feature names.
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Scope of quality information
scope level  dataset
Resource lineage description
Processing Step
date and time 2015-01-01T00:00:00
description TIGER/Line Shapefiles are extracted from the Census MAF/TIGER database by nation, state, county, and entity. Census MAF/TIGER data for all of the aforementioned geographic entities are then distributed among the shapefiles each containing attributes for line, polygon, or landmark geographic data.
source
source description  online
source citation
Title Census MAF/TIGER database
alternateTitle  MAF/TIGER
Publication Date  Date   201505
other Citation Details  Source Contribution: All line segments
cited responsible party - originator
organisation Name  U.S. Department of Commerce, U.S. Census Bureau, Geography Division
AbsoluteExternalPositionalAccuracy
name Of Measure Horizontal Positional Accuracy
measure Description  
evaluation Method Description  The Census Bureau uses Global Positioning System (GPS) coordinates at road centerline intersections to evaluate the horizontal spatial accuracy of source files that may be used to realign road features in the MAF/TIGER database and test the horizontal spatial accuracy of the road features in the TIGER/Line Shapefiles. The test compares a survey-grade GPS coordinate to its associated road centerline intersection in the TIGER/Line Shapefiles. The test is based on an independent collection of GPS coordinates for a random sample of road intersections from a centerline file that meet certain criteria. The points are referred to as the sample points and are gathered through a private contractor working for the Census Bureau. Since the collection method uses survey-quality GPS-based field techniques, the resulting control points are considered 'ground truth' against which the TIGER road centerline intersection coordinates are compared. The distances between the coordinates are calculated and the Census Bureau determines the Circular Error 95% (CE95). That is, the accuracy of the file in meters with 95% confidence. The CE95 can be calculated from the mean and standard deviation by using the formula: mean of differences plus (2.65 times the standard deviation). CE95 results reported for each file tested are determined using a spreadsheet with embedded statistical formula. The use and applicability of the spreadsheet and its embedded formula have been verified by Census Bureau statisticians. The basis of the calculation is the use of the root mean square error (RMSE). This is the method as stated in the U.S. Government's Federal Geographic Data Committee Standard FGDC-STD-007.3-1998, Geospatial Positioning Accuracy Standards. Part 3: National Standard for Spatial Data Accuracy. The results of using this measure of accuracy are in compliance with Federal Spatial Data requirements. In terms of the Census Bureau application, the dataset coordinate values are those taken from the centerline file and the coordinate values from an independent source of higher accuracy are those acquired through the Census Bureau's contractor. Please note that the horizontal spatial accuracy, where reported, refers only to the realigned road features identified as matched to the positionally accurate source file with that accuracy. It is not the spatial accuracy of the TIGER/Line Shapefile as a whole.
Quantitative Result
result value Missing
value Units
Completeness Commission
Completeness Omission
evaluation Method Description  Data completeness of the TIGER/Line Shapefiles reflects the contents of the Census MAF/TIGER database at the time the TIGER/Line Shapefiles were created.
ConceptualConsistency
measure Description  There may be some inconsistencies in feature names along features. An anomaly exists with the sporadic occurrence of road segments comprising a complete chain with different MAF/TIGER Feature Census Class Code (MTFCC) values assigned. This problem could affect applications that use the MTFCC values for network analysis, routing, or for assigning symbology to a feature when creating a map. The Census Bureau performed automated tests to ensure logical consistency and limits of shapefiles. Node/geometry and topology relationships are collected or generated to satisfy topological edit requirements. These requirements include: (1) Complete chains must begin and end at nodes. (2) Complete chains must connect to each other at nodes. (3) Complete chains do not extend through nodes. (4) Left and right polygons are defined for each complete chain element and are consistent throughout the extract process. (5) The chains representing the limits of the files are free of gaps.

Resource distribution information

Distributor
Standard ordering process
fees The online copy of the TIGER/Line Shapefiles may be accessed without charge.
Ordering Instructions  To obtain more information about ordering TIGER/Line Shapefiles visit http://www.census.gov/geo/www/tiger
Format
Format name TGRSHP (compressed)
Format version 
file Decompression Technique  The TIGER/Line shapefiles contain geographic data only and do not include display mapping software or statistical data. For information on how to use the TIGER/Line shapefile data with specific software package users shall contact the company that produced the software.
Format
Format name HTML
Format version 
Digital Transfer Options
Linkage for online resource
name Shapefile Zip File
URL: http://www2.census.gov/geo/tiger/TIGER2015/PRIMARYROADS/tl_2015_us_primaryroads.zip
Digital Transfer Options
Linkage for online resource
name TIGER/Line Shapefiles
URL: http://www.census.gov/geo/maps-data/data/tiger-line.html
Description Should be used for most mapping projects--this is our most comprehensive dataset. Designed for use with GIS (geographic information systems).
Digital Transfer Options
Linkage for online resource
name TIGER/Line Shapefiles 2015 Technical Documentation Shapefiles
URL: http://www2.census.gov/geo/pdfs/maps-data/data/tiger/tgrshp2015/TGRSHP2015_TechDoc.pdf
Description 
Digital Transfer Options
Linkage for online resource
name Feature Catalog for the Current Tribal Census Tract National Shapefile
URL: http://meta.geo.census.gov/data/existing/decennial/GEO/GPMB/TIGERline/TIGER2015/ttract/tl_2015_us_ttract.shp.ea.iso.xml
Digital Transfer Options
Linkage for online resource
name Census 2010 WMS (Web Mapping Service) 2015 Primary Roads layer
URL: https://tigerweb.geo.census.gov/arcgis/services/TIGERweb/tigerWMS_PhysicalFeatures/MapServer/WmsServer?REQUEST=GetMap&SERVICE=WMS&VERSION=1.3.0&LAYERS=Primary Roads&STYLES=default&FORMAT=image/svg+xml&BGCOLOR=0xFFFFFF&TRANSPARENT=FALSE&CRS=EPSG:4326&BBOX= +46.4885652,-123.7376480, +47.8731709, -121.8063833,&WIDTH=891&HEIGHT=751
link function download
Description This web mapping service contains the layer for the primary roads. Since this layer displays at scales of 1:1,400,000 or greater, adjusting the BBox coordinates in the URL is necessary
Digital Transfer Options
Linkage for online resource
name TIGERweb/tigerWMS_PhysicalFeatures (MapServer) Rest Service
URL: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/tigerWMS_PhysicalFeatures/MapServer
Description This Rest Service contains all the Transportation and hydrology layers

Metadata data stamp:  2016-03-15
Resource Maintenance Information
maintenance or update frequency:  notPlanned
notes: This was transformed from the Census Metadata Import Format
Metadata scope code  dataset
Metadata language  eng
Metadata character set encoding:   utf8
Metadata standard for this record:  ISO 19115 Geographic Information - Metadata
standard version:  2009-02-15
Metadata record identifier:  tl_2015_us_primaryroads.shp.iso.xml
URI for dataset described: > http://www2.census.gov/geo/tiger/TIGER2015/PRIMARYROADS

Metadata record format is ISO19139-2 XML (MI_Metadata)