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County Boundary Lines Illinois 2003

Identification Information

Citation
Title
County Boundary Lines Illinois 2003
Originator
Illinois State Geological Survey
Publisher
Illinois State Geological Survey
Place of Publication
Champaign , IL , US
Publication Date
2003-06-01
Edition
2.0
Identifier
https://geodiscovery.uwm.edu/catalog/ark:-77981-gmgsw08wg0s
Geospatial Data Presentation Form
mapDigital
Other Citation Details
Date Acquired: July 27, 2007
Series
Series Title
ISGS GIS Database
Issue
GISDB.IL_BNDY_County_Ln
Abstract
This line data layer represents county boundaries for Illinois in 2003. The dataset was originally published by the Illinois State Geological Survey in June 2003.[This data set contains Illinois county boundary lines. The data were extracted from, and are redundant with, ISGS feature dataset IL_Public_Land_Survey_System. The data set is maintained as a separate entity for ease of query and display. The line attributes indicate which lines also form a portion of the state boundary. The nominal scale is 1:62,500. As of 2003, the data are typically distributed in geographic coordinates (longitude and latitude), decimal degrees, and the North American Datum (NAD) of 1983, and this is the default spatial reference of the ArcSDE feature dataset in which the data are stored. The data were originally developed, however, in a custom Lambert Conformal Conic projection and were distributed in that coordinate system for several years. The data were digitized in the late 1960s and in 1984-85 from 7.5- and 15-minute USGS topographic quadrangles. Errors in the location of a given feature are dependent on the accuracy of the original maps and on the accuracy of digitizing. Estimates are that features have an average locational error of at least plus/minus 100 feet.]
Purpose
This layer is intended for reference and mapping purposes and may be used for basic applications such as viewing, querying, and map output production or to provide a basemap to support graphical overlays and analysis with other spatial data. [These data are appropriate for use in local and regional thematic analysis. The data are not appropriate as a geodetic, legal or engineering base. The data set was originally created for the purpose of producing maps of well locations in Illinois for geologic research by the ISGS and others. It serves as an important base cartographic element for many types of maps and has been widely distributed and used outside the ISGS. The data set was not and is not intended as a substitute for surveyed locations, such as can be determined by a registered Public Land Surveyor. Although useful in a GIS as a reference base layer for maps, the data set has no legal basis in the definition of boundaries or property lines.]
Supplemental Information
AGSL staff supplemented original metadata. For official metadata please see IL_BNDY_County_Ln.f.html and IL_BNDY_County_Ln.html. [The data were originally developed as a part of the ILLIMAP System and were created in the late 1960s and early 1970s for the purpose of producing maps of well locations in Illinois for geologic research by the ISGS and others. It was one of the first efforts in the nation to digitally capture public land survey boundaries. The principal originators of the first version were geologists at the ISGS: Dave Swann, Paul DuMontelle, Dick Mast, and Lindell Van Dyke. The data were initially digitized from 7.5- and 15-minute USGS topographic maps, and this work comprises approximately two-thirds of the present data set. The accuracy was stated as follows: "For the townships digitized from 7.5-minute quadrangles, 95.2 percent of the ILLIMAP distances are within 100 feet of the recorded plat distances, and all are within 180 feet. In townships digitized from 15-minute quadrangles, 82.5 percent of the ILLIMAP distances are within 100 feet of the plat distances, and 98.7 percent are within 200 feet." (ISGS Circular 451, p. 13) For more information on the origin of the data set, refer to the metadata for the IL_Public_Land_Survey_System feature dataset. Also refer to ISGS Circular 451 (ILLIMAP - A Computer-Based Mapping System for Illinois, Swann, DuMontelle, Mast Van Dyke, 1970). That publication discusses the original digitizing work, coordinate conversions, and the accuracy of the results. The database was maintained by the ISGS Computer Services Unit under Van Dyke's direction until 1985 at which time the data were converted to an Arc/Info coverage. The conversion was accomplished by Environmental Systems Research Institute (ESRI) of Redlands, California, working under contract with the ISGS via the Illinois Department of Energy and Natural Resources and its Lands Unsuitable for Mining Program. The remaining one third of the state was digitized from 7.5-minute quadrangles at this time (1984-85.) In 2003 the data set was transitioned from the ESRI ArcInfo coverage data model to the ESRI ArcSDE enterprise geodatabase data model. The data are stored in an Oracle relational database management system (RDBMS) and maintained using ArcGIS software. Recent updates to the data: In March, 1998 the data set as it stood was designated Edition 1.0 for metadata and version management purposes. Edition 1.0 of these data were reviewed for internal logical consistency in March, 1998. As a result, several unneeded .AAT and .PAT items were dropped, tics were replaced, three dangling arcs were corrected and COVER-ID values were recalculated to be unique. See logical consistency report and process steps for March, 1998 for more details. The updated data set was designated edition 1.1. In June, 2003 the data set was transitioned to storage in an Oracle RDBMS using the ArcSDE geodatabase model. At that time this metadata document was significantly updated. The result (and most current edition) is designated Edition 2.0.]
Temporal Extent
Bounding Box
West
-91.513518
East
-87.495214
North
42.508348
South
36.969972
ISO Topic Category
boundaries
Place Keyword
Illinois
Place Keyword Thesaurus
GeoNames
Theme Keyword
Line
Theme Keyword Thesaurus
FGDC
Theme Keyword
Counties
Administrative and political divisions
Theme Keyword Thesaurus
LCSH
Resource Constraints
Use Limitation
Please see the UWM Libraries statement on Copyright and Digital Collections.[Reproduction or redistribution of copyrighted digital data sets or products derived therefrom outside of licensee's 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 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.]
Legal Constraints
Use Limitation
Although this data is being distributed by the American Geographical Society Library at the University of Wisconsin-Milwaukee Libraries, no warranty expressed or implied is made by the University as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the University in the use of this data, or related materials. [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.]
Other Restrictions
None
Status
completed
Maintenance and Update Frequency
notPlanned
Language
eng
Credit
Illinois State Geological Survey
Point of Contact
Contact
Illinois State Geological Survey
Delivery Point
615 E. Peabody
City
Champaign
Administrative Area
IL
Postal Code
61820
Country
US
Email
info@isgs.illinois.edu
Phone
(217)-333-4747

Spatial Reference Information

Reference System Identifier
Code
4269
Code Space
EPSG
Version
6.12(3.0.1)

Data Quality Information

Quantitative Attribute Accuracy Report
Result
Absolute External Positional Accuracy
Result
Quantitative Attribute Accuracy Report
Result
Lineage
Process Step
Description
Changed name of file from IL_BNDY_County_Ln.shp to Illinois_CountyBoundaryLines_2003.shp.
Process Step
Description
[For a complete history of the origin of this data set, refer to the metadata for the IL_Public_Land_Survey_System feature dataset. An internal logical consistency check was performed in March, 1998. Refer to the Logical Consistency report. As a result, the following changes/updates were made to the data: TICS - The data set had eight tics along the northern border of the state. For better tic distribution, these were replaced with ten tics from quad100 from the ISGS GISDB archive, evenly distributed around the state. However, users needing registration tics for use with these data (or a subset of these data) should expect to create a task-specific tic set, usually based on section corners. REMOVAL OF ITEMS - The following empty .AAT items were dropped: STATE2C.OLD#, STATE2C.OLD-ID, ORIG-ID, SYMBOL, SYMB. UNIQUE COVER-ID VALUES - COVER-ID values in the .AAT and .PAT were calculated to equal (COVER# - 1) in order to make them unique. At this time it was decided to maintain a record of GIS versions of this data set. The data set prior to review was (arbitrarily) designated Edition 1.0. Upon completion of the review, the data set was designated as Edition 1.1. These dangles were corrected by removing 2 spurious arcs: Dangling Node 29 at ( 3414662.00000, 3153298.00000) Dangling Node 30 at ( 3414678.50000, 3153298.50000) Dangling Node 107 at ( 2862288.00000, 2578612.00000)]
Process Date
1998-03-01T00:00:00
Process Step
Description
[The coverage was imported into an ArcSDE enterprise geodatabase feature dataset for storage. The resulting SDE edition is designated Edition 2.0. The jump from edition 1.2 to 2.0 reflects the significant change in fundamental data storage model from coverage to ArcSDE enterprise geodatabase. It also reflects the change in default spatial reference from the customary ISGS Lambert Conformal Conic projection (NAD27) to a geographic coordinate system (longitude, latitude) in decimal degrees (NAD83). The SDE name of the data set is GISDB.IL_BNDY_State_and_County_Boundaries. The various coverage feature classes were imported using ArcCatalog 8.2. On import to SDE these redundant attribute fields were deleted: COUNTLINE,TOWNLINE, SECLINE, INDLINE Also at this time, this metadata file was considerably rewritten and updated.]
Process Date
2003-04-01T00:00:00
Source
Title
USGS 7.5- and 15-minute topographic quadrangles
Originator
United States Geological Survey
Description
[Lines depicting county boundaries in the state of Illinois.]

Distribution Information

Format Name
Shapefile
Format Version
1.0
Distributor
University of Wisconsin-Milwaukee
Distributor
Illinois State Geological Survey
Online Access
Protocol
Name

Spatial Representation Information

Vector
Topology Level
geometryOnly
Vector Object Type
composite
Vector Object Count
347

Metadata Reference Information

Hierarchy Level
dataset
Metadata File Identifier
ark:/77981/gmgsw08wg0s
Dataset URI
https://geodata.uwm.edu/public/gmgsw08wg0s/Illinois_CountyBoundaryLines_2003.zip
Metadata Point of Contact
Name
Illinois State Geological Survey
Delivery Point
615 E. Peabody
City
Champaign
Administrative Area
IL
Postal Code
61820
Country
US
Email
info@isgs.illinois.edu
Phone
(217)-333-4747
Metadata Date Stamp
2020-01-06
Metadata Standard Name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata Standard Version
2007
Character Set
utf8
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