Keywords
Theme:
fixed-guideway, transportation, transit, light rail, heavy rail, monorail, inclined plane, cable car, commuter rail, automated guidway, high-occupancy vehicle lanes
Place:
United States, USA, US, US Territories
Stratum:
Ground
Temporal:
2004, 2006, 2007, 2008, 2009
Description
Abstract
Version 2004 of the Fixed-Guideway Transit Network is a network database of the nation's fixed-guideway transit systems. The data set covers systems in cities defined as FTA's universe of cities and includes heavy rail, light rail, monorail, cable car, inclined plane, and automated guideway.
Purpose
The data provide users with information about the location and type of fixed-guideway transit and terminal facilities primarily for regional cartographic, spatial and network analysis purposes.
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Status of the data
In work
Data update frequency:
Irregular
Time period for which the data is relevant
Date and time:
2009
Description:
publication date
Publication Information
Who created the data: Federal Transit Administration (FTA), Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS)
Date and time:
2004
Publisher and place:
Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS), Washington DC
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Data storage and access information
File name: transit_link
Type of data: vector digital data
Location of the data:
http://www.bts.gov/programs/geographic_information_services/
Data processing environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.6.1500
Accessing the data
Data format: ESRI Shapefile
Size of the data: 0.900 MB
Data transfer size: 0.689 MB
How to decompress the file: No compression applied. However, if using digital transfer online option, note access instructions.
Access instructions: NTAD is available for download at www.bts.gov/programs/geographic_information_services. The NTAD DVD can also be ordered from the online bookstore at www.bts.gov.
Available media: DVD
Constraints on accessing and using the data
Access constraints:
None
Use constraints:
Acknowledgment of the Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS) National Transportation Atlas Databases (NTAD) 2009 would be appreciated in products derived from these data.
Details about this document
Contents last updated: 20090403
at time 12452800
Who completed this document
Geospatial Information Program
Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS)
mailing and physical address:
Washington, District of Columbia 20590
USA
202-366-DATA (voice)
answers@bts.gov
Standards used to create this document
Horizontal coordinate system
Geographic coordinate system name: GCS_WGS_1984
Details
Geographic Coordinate System
Latitude Resolution: 0.000000
Longitude Resolution: 0.000000
Geographic Coordinate Units: Decimal degrees
Geodetic Model
Horizontal Datum Name: D_WGS_1984
Ellipsoid Name: WGS_1984
Semi-major Axis: 6378137.000000
Denominator of Flattening Ratio: 298.257224
Altitude System Definition
Resolution: 0.000010
Encoding Method: Explicit elevation coordinate included with horizontal coordinates
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Bounding coordinates
Horizontal
In decimal degrees
West:
-122.991273
East:
-70.626380
North:
47.979935
South:
25.680243
In projected or local coordinates
Left: -122.991273
Right: -70.626380
Top: 47.979935
Bottom: 25.680243
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Lineage
FGDC lineage
Process step 1
Process description: Source data were compiled from a number of transit sources.
The SOURCE field identifies the original source of the data.
The source data were checked for duplicate arcs, connectivity problems such as dangles were corrected.
All stations were checked for existence and added when necessary.
Nodes were added to the Network at Station locations to facilitate routing .
Psuedo Nodes where arcs cross without a station are flagged Status = 9.
Source used: See SOURCE Field
Who did this process
University of Tennessee Center for Transportation Research (UTCTR)
mailing and physical address:
309 Conference Center Building
Knoxville, TN 37996-4133
USA
865-974-5255 (voice)
865-974-3889 (fax)
Process step 2
Process description: Dataset copied.
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Spatial data quality
Horizontal positional accuracy
Right-of-ways for fixed guideways were developed from GIS data provided by FTA, RITA/BTS and local transit agencies. In most cases, the source data are very accurate and complete. In rare cases where the lines were digitized, DOQQ's for the local area were used as a reference for heads-up digitizing. Station locations were verified using street maps, local DOQQ's and USGS DOQ's which were available via the internet from a variety of publically available data clearinghouses.
Data include a SOURCE field that identifies the original source of the data.
Estimated accuracy: unknown
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Spatial data description
Vector data information
ESRI description
transit_link
ESRI feature type: Simple
Geometry type: Polyline
Topology: FALSE
Feature count: 2570
Spatial Index: TRUE
Linear referencing: FALSE
SDTS description
Feature class: SDTS feature type, feature count
transit_link:
String, 2570