Illinois Natural Areas - Part 1 - Polygons

This data set depicts the natural areas in Illinois, digitized
from USGS 7.5 minute quadrangles or from aerial photographs at
a scale of 1:8,000. Boundaries are approximate and do not
indicate ownership or property boundaries. There is a
supplemental point coverage named natareat for those areas
which had not been mapped as of October, 1995.

These data are appropriate for use on local and regional thematic
analysis. Data are not accurate enough to be used as a geodetic or
engineering base. Error estimation is not possible due to the
nature of the boundaries. Those areas digitized from aerial photos
have, in addition to the approximate boundary, delineation of the
community types. Users requiring definitive data on boundaries
should contact the Division of Natural Heritage, 600 N. Grand West,
Springfield, IL 62702 [phone].