Illinois State Geological Survey, 1996 - not published, Interstates and Toll Roads in Illinois: IDNR GIS Database intstate, Illinois State Geological Survey, Champaign, Illinois.Online Links:
- Downloadable Data (Shift-Click to download data file) <URL:http://www.isgs.uiuc.edu/nsdihome/browse/statewide/intstate.e00>
- Browse Graphic (GIF) Screen-size image representing the nature of the data. <URL:http://www.isgs.uiuc.edu/nsdihome/browse/statewide/intstateb.gif>
- Text (.txt) version of this Metadata file. (Shift-Click to download documentation) <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/intstate.txt>
- HTML (.html) version of this Metadata file. (Shift-Click to download documentation) <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/intstate.html>
This is a Vector data set. It contains the following vector data types (SDTS terminology):
The map projection used is Lambert Conformal Conic.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest not determined
Ordinates (y-coordinates) are specified to the nearest not determined
Planar coordinates are specified in feet
The horizontal datum used is NAD27.
The ellipsoid used is Clarke 1866.
The semi-major axis of the ellipsoid used is 6378206.4 meters.
The flattening of the ellipsoid used is 1/294.98.
Arc Attributes:
INTERST# - The value is equal to the designated route number of the interstate. Where several interstates overlap, the value includes all designated route numbers separated by a zero. For example, 70057 indicates that the arc represents a portion of the interstate that is designated both as I-57 and I-70. There is a single exception: The Elgin-O'Hare Expressway has not been officially numbered. Valid values are 24, 39, 55, 57, 64, 70, 72, 74, 80, 88, 90, 94, 155, 172, 180, 190, 255, 270, 290, 294, 355, and 474.
INTERST# - Redefined to INT#1, INT#2, INT#3 INT#1, INT#2, and INT#3 - Interstate route numbers Route numbers are contained in a single item which is subsequently redefined to deal with coincident routes (routes carrying more than one highway route number). Any route having a value for route 2 or 3 should also have a value for route 1. from DLG files, 1980-86, USGS and IDOT county base map series.
US# - The value is equal to the US highway route where the arc represents both a portion of the interstate system and the US highway system. If one or more US highways overlap the interstate, the value includes all designated route numbers separated by a zero. Valid values are 6, 36, 40, 50, and 51.
STATE# - The value is equal to the Illinois highway route where the arc represents both a portion of the interstate system and the Illinois highway system. Currently, no portions of the interstate system overlap with the Illinois highway system.
Coverage construction: ISGS and INHS staff Latest updates: B. Stiff, P. Weibel Documentation: D. Nelson, P. Weibel, and S. Beaverson Quality Control: ISGS and INHS staff
217-333-4747 (voice)
217-244-0802 (FAX)
isgs@isgs.uiuc.edu
In a natural resources context, interstates and toll roads are primarily used as a cartographic element on maps for spatial reference. They are also used for analyses that require, for example, a buffer area between roads and natural features. These data are appropriate for use in local and regional thematic analysis. They are not appropriate as a geodetic or engineering base.
Survey, US Geological , 1980-1991, US Geological Survey 1:100,000 Digital Line Graph files, transportation layer.
Survey, US Geological , varies, US Geological Survey 1:24,000 topographic quadrangles.
Illinois Department of Natural Resources, 1994, Illinois State Roads: IDNR GIS Database stroutes, Illinois Department of Natural Resources, Champaign, Illinois.Online Links:
- Data Set Documentation <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/stroutes.html>
Illinois Department of Natural Resources, 1994, U. S. Highways in Illinois: IDNR GIS Database ushways, Illinois Department of Natural Resources, Champaign, Illinois.Online Links:
- Data Set Documentation <URL:http://www.isgs.uiuc.edu/nsdihome/outmeta/ushways.html>
not available
In general, accuracy is equal to that of 1:100,000 analog source maps based on USGS National Map Accuracy Standards. Some updates were taken from USGS 7.5' topographic quadrangles. These updates are within one line-width of the corresponding line on the source map. No accuracy statement was provided with the source map.
No statement of completeness was provided with the original USGS DLG data. Visual inspection and use suggests that coverage is comprehensive but reflective of the date of source map publication date. This date varies across the state. All interstates and toll roads contained in USGS 1:100,000 DLG files are included.
Chain-node topology present. Data set is topologically structured linear data with nodes at all intersections. Pseudo nodes (nodes between arcs with common attribute values across all non-system attribute fields) may exist on some arcs.
Are there legal restrictions on access or use of the data?
- Access_Constraints: none
- Use_Constraints:
- Reproduction or redistribution of copyrighted digital data sets or products derived therefrom outside of licensees' organization or entity is expressly forbidden. The only exception is redistribution to consultants working for the licensee, and then only for purposes, related to work for the licensee. Such consultants may not further reproduce or redistribute these data sets. None of these data shall be electronically duplicated on magnetic or optical media for use by others, in whole or in part, without permission of the appropriate custodial division within DNR.
Any hardcopies utilizing DNR data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent DNR data sets, nor to imply that changes they made were approved by DNR.
These data are not to be used for commercial profit.
217-333-4747 (voice)
217-244-0802 (FAX)
isgs@isgs.uiuc.edu
An Arc/Info .e00 (export) file is currently available free of charge at the Illinois Natural Resources Geospatial Data Clearinghouse. Refer to the Citation Information portion of this file for access to downloadable data and metadata, and a visual (GIF image) representation of the data.
The Illinois Department of Natural Resources (DNR) provides these geographic data "as is." DNR makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. DNR further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers of DNR, no warranty, expressed or implied, is made by DNR regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty.In no event shall the DNR have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by DNR.
217-333-4747 (voice)
217-244-0802 (FAX)
isgs@isgs.uiuc.edu
Illinois Natural Resources Geospatial Data Clearinghouse
Generated by mp version 2.8.11 on Mon Jan 29 15:19:37 2007