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Big Ten Academic Alliance Geoportal

PLSS Townships: Illinois, 2003

Attribute Value
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Creator:
Illinois State Geological Survey
Description:
This dataset contains townships from the Illinois Public Land Survey System in line and polygon form. Line attributes identify state, township and range boundaries, principal meridians, and base lines. Polygon attributes identify meridian, township, range. 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.
Publisher:
University of Illinois Urbana-Champaign
Collection:
Academic Institutions Geospatial Data
Place:
Illinois, United States
Subjects:
Boundaries and Planning and Cadastral
Types:
Dataset and Service
Year:
1968-1979
Contributed by:
Illinois
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