U.S. National Transportation Atlas Interstate Highways represents rural and urban interstate highways. U.S. National Transportation Atlas Interstate Highways is part of the National Highway Planning Network, published by the Federal Highway Administration as part of the National Transportation Atlas Databases for the United States.
U.S. National Transportation Atlas Interstate Highways provides a comprehensive database of interstate highways from the nation's principal arterial highway system and the National Highway System. The data is generalized to improve draw performance and be used effectively at a national level.
Largest scale when displaying the data: 1:250,000.
publication date
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Members of the Geographic Information Systems Laboratory, Pellissippi Research Institute, The University of Tennessee, Knoxville.
The shapefile is converted to SDC (Smart Data Compression) format using either ESRI SDC Data Development Kit Professional 2 (DDKP2) or tools in ArcGIS. The SDC data set is then loaded into ArcSDE® to verify and validate the geometry.
After processing, the data set is checked for drawing display and number of records and file sizes compared with source materials.
The original positional accuracy had a maximal positional error of ±80 meters, and then it was generalized to a tolerance of 0.003 decimal degrees. The positional accuracy is unknown.
Attribute and geospatial data
Attribute data
Attribute data
The general processing steps for the creation of the National Highway Planning Network: - [1993] Conflation of attributes for rural highways from [National Highway Planning Network V1.1, Bruce Peterson, Oak Ridge National Laboratory, 1992] to [USGS Digital Line Graph (DLG-3, 1978) Series] road alignments using R-MATCH software developed by the Geographic Information Systems Group, University of Tennessee. - [1993] Digitizing and conversion of state supplied digital and map data. Line work geodetically controlled to match [USGS Digital Line Graph (DLG-3, 1978) Series] line work. - [1994] Integration of conflated version of [National Highway Planning Network V1.1, Bruce Peterson, Oak Ridge National Laboratory, 1992] and assimilated State Departments of Transportation data into a comprehensive topologically integrated network database. States edgematched and National Highway System attributes verified. - [1997] Integration of supplemental State Departments of Transportation data into the National Highway Planning Network Version 2. National Highway System attributes verified. - [1998] Integration of intermodal connectors links into the National Highway Planning Network Version 2. States edgematched and National Highway System attributes verified. - [2001] Update of National Highway System and Intermodal connector links into the National Highway Planning Network Version 4.0. States edgematched and National Highway System attributes verified.
The following steps were performed by ESRI: Copied U.S. National Transportation Atlas Highways and symbolized interstates, four-lane roads and the rest uniquely. Selected and kept all interstates, major thoroughfares and any other road segments needed to represent the major drive patterns depicted in a typical highway road atlas. Several features had no route name and were given values from its neighboring features or by referencing the National Geographic Road Atlas. Corrected hundreds of gaps in the road network. Generalized to a tolerance of 0.003 decimal degrees. Added attributes CLASS, NUMBER, and SUFFIX from ESRI Data & Maps 2002 U.S. National Transportation Atlas Interstate Highways based on the ROUTE_NUM attribute. Unsplit features based on combining all attributes. Added and calculated attributes DIST_MILES and DIST_KM. Created ArcGIS® layer file (.lyr), projection file (.prj), and spatial indices. Converted the data set to SDC.
The following steps were performed by ESRI: Added Minnesota Drive in Anchorage, AK. Put value S in attributes ROUTE_NUM and CLASS, and calculated the values for attributes DIST_MILES and DIST_KM.
Internal feature number.
ESRI
Feature geometry.
ESRI
A composite field for the road feature comprised of the primary sign route that identifies the class, sign route number that can include a directional indicator, and a qualifier. The first character identifies the class, the following characters up to but not including a blank identify the sign route number that can include a directional indicator, a blank, and the last character identifies the qualifier.
ESRI
(blank) - not signed, I - Interstate, U - U.S. route, S - State route, O - Off-Interstate business marker, C - County route, T - Township, M - Municipal, P - Parkway or Forest route marker, N- None of the above.
Bureau of Transportation Statistics
Any combination of: A Z, 0 9, N, S, E, W.
Bureau of Transportation Statistics
This separates the sign route number from the qualifier.
Bureau of Transportation Statistics
(blank) - No qualifier, not signed, or not applicable; A - Alternate route; B - Business route; P - Bypass; S - Spur; L - Loop; F - Proposed (future); D - Temporary (detour); T - Truck route; N - None of the above.
Bureau of Transportation Statistics
The primary sign route that identifies the class of the road feature.
Bureau of Transportation Statistics
(blank) - not signed, I - Interstate, U - U.S. route, S - State route, O - Off-Interstate business marker, C - County route, T - Township, M - Municipal, P - Parkway or Forest route marker, N- None of the above.
Bureau of Transportation Statistics
The primary sign route that identifies the sign route number, that can include a directional indicator, of the road feature.
Bureau of Transportation Statistics
Any combination of: A Z, 0 9, N, S, E, W.
Bureau of Transportation Statistics
The primary sign route that identifies the qualifier, if any, of the road feature.
Bureau of Transportation Statistics
(blank) - No qualifier, not signed, or not applicable; A - Alternate route; B - Business route; P - Bypass; S - Spur; L - Loop; F - Proposed (future); D - Temporary (detour); T - Truck route; N - None of the above.
Bureau of Transportation Statistics
The length of the road feature in miles.
Bureau of Transportation Statistics
The length of the road feature in kilometers.
Bureau of Transportation Statistics
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See use constraints.
The SDC file contains the geospatial and attribute data. The SDI file contains the spatial index. The PRJ file contains the coordinate system information (optional). The XML file (*.sdc.xml) contains the metadata describing the data set (optional).
ESRI Data & Maps is available only as part of ESRI® software.
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