Population and Housing, Bureau of the Census, U.S. Department of Commerce,
April 1983.
specific terms relevant to the agency or person making the request, and/or
current freedom of information statutes in the State of Illinois.
network without explicit permission from the Northeastern Illinois Planning
Commission.
It is required that the Northeastern Illinois Planning Commission be cited in any
products generated from the data. The following source citation must be
included: "Source: Northeastern Illinois Planning Commission's 1:24,000-Scale
1990 Major Roads Centerline File, Version 1.1, April 1999, NIPC ReGIS,
Chicago, Illinois."
It is not recommended that these data be displayed or used at scales larger than
1:24,000 (e.g., 1:1200), the scale at which the data were collected. These data
are intended only for display of regional road centerlines, not for the
determination of legal road centerlines or names at any given location.
For custom requests a client must submit a written request stating the intended
applications for the data to NIPC. When the request is granted, data may be used
only for the purposes explicitly stated in the written request. See "Ordering
Instructions" for more detail.
Northeastern Illinois Planning Commission
222 South Riverside Plaza, Suite 1800
Chicago, Illinois 60606
Institute's (ESRI'S) ARC/INFO version 6.x GIS software on SUN equipment
running UNIX OS 4.1.3. The coverage currently resides in ESRI's ARC/INFO
version 7.2.1.
topographic sheets, Rand McNally Streetfinder 1989, county highway maps, and
the U.S. Bureau of the Census' TIGER/Line File 1990. Since these sources often
conflicted or were ambiguous, and no field checking was conducted, the accuracy
is variable. Visual inspection of checkplots for consistency in road names was
performed. There is an attribute table associated with the line coverage. Road
names are present on all segments of roads with two exceptions: 1) roads in the
old Joliet Arsenal area; 2) Interstate access ramps.
and is built as a line coverage. The software provided verification of line
topology. Because of the omission of interstate highways, there are known gaps
or breaks in cross-roads where there might ordinarily be an intersection with an
interstate. Some roads simply end. Additionally, due to the variety of methods
for adding road segments, there may be very small, missing road segments.
While some review was done for these, comprehensive and exhaustive checking
or corrections has not been done to correct for these errors.
Medium Duty, Primary Roads, and Secondary Roads were included. Light Duty
roads were only occasionally included for connectivity purposes as well as to
create an even distribution of roads for a particular area. For the most part, all
U.S. and State highways are included. Larger county roads are present.
Completeness is judged to be moderate based on visual review, but an
exhaustive check has not been performed because road classifications from
different sources are inconsistent. The road network generally represents Spring
1990 based on NIPC's aerial photos for northeastern Illinois taken at that time.
(NOTE: Efforts were made to make this file conform to ground conditions in
1990. Because some roads were added using USGS 7.5 minute topographic
sheets and corresponding Digital Raster Graphics files, some segments may
represent ground conditions at times other than 1990.)
quadrangles (both hardcopy and digital DRGs), which are compiled to meet
National Map Accuracy Standards (NMAS) for 1:24,000-scale data. Therefore,
accuracy is no better than that of the source material. Cartographic offsets may
be present on the graphic source, due to scale and legibility constraints, but for
connectivity purposes, offsets were smoothed if necessary. Horizontal positional
accuracy for the digital data was tested extensively at the beginning of the
process using paper check plots that were compared to the original aerials, mylar
quadrangles, and other source materials. Subsequent additions to the road file
were based on heads-up digitizing with DRGs as backdrop and were not
subjected to as fine a review.
Photographs
from the spring 1990 fly-over; enlarged from 1"=2000' to
1"=400'
their configuration on the ground at the time of the flights.
identify street names.
quadrangles.
used to register mylar overlays for manuscripting to a 1:24,000-scale.
Department
Development Department, Geneva, IL; produced by Northern Illinois University,
Department of Geography, Laboratory for Cartography and Spatial Analysis,
DeKalb, IL
by Northern Illinois University, Department of Geography,
Laboratory for Cartography and Spatial Analysis, DeKalb, IL
road names.
Woodstock, Illinois; prepared by Northern Illinois University, Department of
Geography, Laboratory for Cartography and Spatial Analysis, DeKalb, Illinois
road names.
County, Illinois
USGS 7.5 minute quadrangles).
major roads file.
names.
linear streets.
User Services Division
User Services Division
areas which include legends, titles, and scale bars were digitally trimmed from
each so neighboring DRGs could be displayed side by side. Second, the
coordinates of the DRGs were changed from the UTM projection to the Lambert
Conformal Conic projection. They used USGS DRGs of the following citation:
U.S. Geological Survey Digital Raster Graphic (DRG); Reston, VA; 19970107.
process of inventorying and drafting land use for 1990. A variety of sources were
used including, the NIPC_aerials90, mylar_quads, streetfinder89,
NIPC_basemap82, boulevards_atlas89, Chicago_map93, Cook_atlas84,
DuPage_plat83, Kane_plat92, Lake_plat92, McHenry_plat93, Will_plat92. The
roads were processed in a manner consistent with the rest of NIPC's 1:24,000-
Scale 1990 Land Use Inventory. For further details in the manual production
rules for the land use inventory, please see that metadata. The resulting product
was a set of 80 mylar_overlays registered to their respective USGS 7.5 minute
quadrangles.
boulevards_atlas89, Chicago_map93, Cook_atlas84, DuPage_plat83,
Kane_plat92, Lake_plat92, McHenry_plat93, Will_plat92
NIPC's 1:24,000-Scale 1990 Land Use Inventory. During digitizing, RMS errors
greater than 0.003 were considered unacceptable and re-registered. Check plots
were generated; missing or badly placed lines were redigitized. Lines
corresponding to roads were coded as such; cursory checking was done to be
sure coding was correct. Edgematching was performed to create one seamless
coverage, although the information is stored as a set of 80 ARC/INFO coverages,
each corresponding to the extent of a USGS 7.5 minute quadrangle. At this point,
land use and roads were integrated together in these coverages.
selected out based on their attributes. Everything else was deleted. These 80
coverages were appended together into one file containing a preliminary major
road network. (It is notable here that expressways and tollways and some wider
road segments had been collected as polygons in the land use file, and therefore,
were never given centerlines in this process.)
to, reprocessed, and rechecked intermittently over the course of the next two and
a half years (mostly in 1996 and again in late 1998 and early 1999). Basically,
two types of activities were performed: 1) complete the road network (which
means making sure that the (a) major roads we wanted were there and that (b)
there were no unintentional gaps in the roads); and 2) add road names, highway
numbers and road classifications.
Processing for McHenry and Lake counties utilized slightly different methodology
with respect to scale of checkplotting (done at 7.5 minute quadrangle detail) and
mainly due to source material available: plat maps, county highway maps, and
Rand McNally Streetfinder (Lake_countyroads_map92, Lake_plat92,
McHenry_countyroads_map93, McHenry_plat93, and streetfinder89). Street
names and classifications came primarily from plat books and secondarily from
county highway maps.
When this process proved too time consuming, remaining counties (Cook,
DuPage, Kane, and Will) were processed differently, using TIGER/Line90 as the
main source of road names and some road classifications. During checking,
additional sources were introduced as county-scale checkplots were drawn for
inspection (Cook_countyroads_map95, DuPage_countyroads_map95,
Kane_countyroads_map94, Will_countyroads_map96,
Will_us_stateroads_guide88, Will_us_stateroads_map88). When no other source
of road names was available, or when road names were in conflict, Rand
McNally Streetfinder (streetfinder89) was used as the source.
McHenry_countyroads_map93, McHenry_plat93, streetfinder89, TIGER/Line90,
Cook_countyroads_map95, DuPage_countyroads_map95,
Kane_countyroads_map94, Will_countyroads_map96,
Will_us_stateroads_guide88, Will_us_stateroads_map88
release. This included a more systematic check for missing road segments and
additional spot-checking for road names and classifications. Rand McNally
(streetfinder89) was the definitive source of road names when there was any
question. Street types (i.e., avenue, street, road, boulevard, highway) were
selected out and given consistent abbreviations (i.e., Ave, St, Rd, Blvd, Hwy).
Missing road segments were added via heads-up digitizing using
ISWS_DRGs as a resource, and they were added by an outside contractor
(Chicago Area Geographic Information Study (CAGIS), University of Illinois at
Chicago). CAGIS also added missing road names using streetfinder89.
ISWS_DRGs
classifications
include road classifications where known (i.e., county, U.S., State) and primary
road name which might be numeric in the case of county, U.S., or State roads.
1990 Major Roads Centerline File, Version 1.1, April 1999
> Data Dictionary: Northeastern Illinois Planning Commission's 1:24,000-Scale
> 1990 Major Roads Centerline File, Version 1.1, April 1999
>
> Source: Northeastern Illinois Planning Commission
> Format: Data stored in ARC/INFO Version 7.2.1
>
> Attribute Label Attribute Definition Attribute Type
> wdth oput type #dec
> FNODE# Internal ARC/INFO number 4 5 Binary
> TNODE# Internal ARC/INFO number 4 5 Binary
> LPOLY# Internal ARC/INFO number 4 5 Binary
> RPOLY# Internal ARC/INFO number 4 5 Binary
> LENGTH Length of road, in feet 8 18 Floating 5
> MROADS# Internal ARC/INFO number 4 5 Binary
> MROADS-ID Internal ARC/INFO number 4 5 Binary
> ROADNAME Road name 40 40 Character
> ROADCLASS Road classification 10 10 Character
> ALTROADCLASS Alternate road classification 10 10 Character
> NAMESOURCE Source of road name 10 10 Character
> INITIALS Initials of digitizer 3 3 Character
>
> FNODE#
> Attribute Definition: ARC/INFO's "FROM" node. DON'T CHANGE THE VALUE OF
> THIS ITEM.
>
> Attribute Domain Values:
> FNODE# > 0
>
> TNODE#
> Attribute Definition: ARC/INFO's "TO" node. DON'T CHANGE THE VALUE OF THIS
> ITEM.
>
> Attribute Domain Values:
> TNODE# > 0
>
> LPOLY#
> Attribute Definition: ARC/INFO's "Left Polygon" ID. DON'T CHANGE THE VALUE
> OF THIS ITEM.
>
> Attribute Domain Values:
> LPOLY# > 0
>
> RPOLY#
> Attribute Definition: ARC/INFO's "Right Polygon" ID. DON'T CHANGE THE VALUE
> OF THIS ITEM.
>
> Attribute Domain Values:
> RPOLY# > 0
>
> LENGTH
> Attribute Definition: ARC/INFO's calculation of the length of the arc in
> units of projected space (feet, in this coverage).
> Dynamic variable. (For your reference, 5280 feet = 1
> linear mile.)
>
> Attribute Domain Values:
> LENGTH > 0
>
> MROADS#
> Attribute Definition: ARC/INFO's internal number. DON'T CHANGE THE VALUE OF
> THIS ITEM.
>
> Attribute Domain Values:
> MROADS# > 0
>
> MROADS-ID
> Attribute Definition: ARC/INFO's internal ID number. It is not recommended
> to change the value of this item.
>
> Attribute Domain Values:
> MROADS-ID > 0
>
> ROADNAME
> Attribute Definition: Name of road in upper/lower case.
>
> Attribute Domain Values:
> free text (e.g., Maple Ave, Jackson Blvd)
> Road Abbreviation Key:
> Rd = Road
> Av = Avenue
> Dr = Drive
> Hwy = Highway
> St = Street
> Blvd = Boulevard
> Ln = Lane
> Pl = Place
> N = North
> Pkwy = Parkway
> Tpke = Turnpike
> Terr = Terrace
> Ct = Court
> Trl = Trail
> Brdg = Bridge
> Byp = Bypass
>
> ROADCLASS
> Attribute Definition: Classification of road in upper case
>
> Attribute Domain Values:
> US
> STATE
> COUNTY
> LOCAL
> OTHER
>
> ALTROADCLASS
> Attribute Definition: Alternate classification of road in upper case
>
> Attribute Domain Values:
> US
> STATE
> COUNTY
> LOCAL
> OTHER
>
> NAMESOURCE
> Attribute Definition: Source of road name
>
> Attribute Domain Values:
> TIGER90
>
> INITIALS
> Attribute Definition: Initials of person who digitized road segment
>
> Attribute Domain Values:
> free text
Centerline File, Version 1.1, April 1999
and current information about northeastern Illinois. Although
every effort has been made to ensure the accuracy of
information, errors and conditions originating from physical
sources used to develop the database may be reflected in the
data supplied. The client must be aware of data conditions
and bear responsibility for the appropriate use of the
information with respect to possible errors, original map
scale, collection methodology, currency of data and other
conditions specific to certain data. No warranty expressed or
implied is made by NIPC regarding the accuracy or utility of
this information.
tape drive.
TAPEWRITE
density DOS diskette.
tape drive.
TAPEWRITE
density DOS diskette.
of client (contributor or non-contributor to NIPC). Pre-payment is required for all
orders. All costs are subject to change without notice. Please check with NIPC to
ensure current information.
Custom distribution: Minimum cost for custom distribution of this file is $150 plus
media costs.
CD-ROM distribution: This file is contained in the "Northeastern Illinois Planning
Commission's Digital Map of the Region, Version 1.0, May 1999". Cost of
distributing this CD-ROM is $45 plus postage.
FTP distribution: Accessing the individual file or its updates through NIPC's FTP
site will be by subscription. Cost of subscription has not yet been determined.
Check the "Publication and Services" page on NIPC's general website
(http://www.nipc.cog.il.us) for announcements pertaining to our FTP site.
Information in this section), NIPC will mail or fax a copy of a template release
letter to the client. A copy of the completed release letter on the client's stationery
must be received along with payment before the data can be released and sent.
CD-ROM distribution: If you have access to the Internet, please download an
order form for the CD-ROM from http://www.nipc.cog.il.us/services.htm, complete
it, and mail or fax it with your payment to:
Northeastern Illinois Planning Commission
222 South Riverside Plaza, Suite 1800, Chicago, IL 60606
ATTN: Publications Department
(312) 454-0400 phone (312) 454-0411 fax
If you do not have Internet access, you may call the Publications Department and
ask them to fax or mail you a copy of the form.
FTP distribution: The capability to access data and its updates through NIPC's
FTP site will soon be available. The terms for accessing this FTP site have not
yet been determined. Check the "Publication and Services" page on NIPC's
general website (http://www.nipc.cog.il.us) for announcements pertaining to our
FTP site.
resources. Cost estimates can be made on request. Please contact NIPC for
further details.
compatibility is the user's responsibility.
data set identified and received from NIPC. It is not to be
altered or summarized. NIPC does not support secondary
distribution. If this geospatial data set was received from
anyone besides NIPC, this metadata file and the geospatial
data set it describes may lack integrity.
Please send questions or comments to Contact in Metadata Reference Information
Section.