[Keyword='Geographic Information Systems']
Glacial Boundaries in IllinoisEntry ID: IGDNR_GLCBND
Abstract: This is an Arc/Info polygon data set containing glacial boundary lines
representing the extent of glaciation for major glacial episodes in Illinois.
Data are originally from the Quaternary Deposits in Illinois (1:500,000) map by
Lineback (1979). Data have been subsequently modified to conform with the
reclassification by Hansel and Johnson, ISGS Bulletin 104 (1996). Glacial
... episode is identified for each polygon. The data include the Wisconsin,
Illinois and the Pre-Illinois episodes. Areas not glaciated are also
identified. The nominal scale is 1:500,000.
The data are appropriate as a statewide overview of the extent of the major
glacial episodes in Illinois. The data are not appropriate as a map base,
except in generalized geologic mapping.
Origin of the data:
This layer originated with the Integrated Terrain Unit (ITU) digital data set
prepared for the ISGS by Environmental Systems Research Institute, Inc. (ESRI)
of Redlands, California in 1984.
The ITU manuscript synthesizes and organizes natural resource information for
the state. Data included are natural divisions, bedrock geology, Quaternary
geology, STACK units, glacial boundaries, soul associations, SCS land resource
areas, ecoregions, and potential natural vegetation. The mapping resolution was
generally 640 acres. Waterbodies were mapped to a minimum size of 320 acres.
Data were integrated in the following order: Quaternary geology, stack units,
glacial boundaries, bedrock geology, soil associations, natural divisions,
potential natural vegetation, SCS land resource areas, and finally ecoregions.
Updates to the data:
Edition 1.0 of these data were reviewed for internal logical consistency in
May, 1998. As a result, tics were replaced, COVER-ID values were recalculated
to be unique, and major revisions were made to polygon boundaries and
attributes. See logical consistency report and process steps for May, 1998 for
more details. The updated data set (this one) is edition 1.1.
Data Set Citation
Dataset Originator/Creator: Illinois State Geological Survey
Dataset Title: Glacial Boundaries in Illinois
Dataset Series Name: ISGS GIS Database
Dataset Release Date: 1998
Dataset Release Place: Champaign, Illinois
Dataset Publisher: Illinois State Geological Survey
Issue Identification: glcbnd
Data Presentation Form: map
Start Date: 1996-01-01
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.
Data Set Progress
Distribution Media: Online
Distribution Size: 241KB
Distribution Format: Arc/Info export format
Fees: No fees
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2004-02-10
Last DIF Revision Date: 2017-08-23