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Base Data and Public Land Survey System Data

GIF images are not cartographic products; they portray the general nature of the data.


Illinois County Boundaries, Polygons and Lines

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Contains Illinois county boundaries in line and polygon formats. The polygon attribute data include county name and number (FIPS) designations. The line attributes indicate which county lines also form the state boundary. The data were extracted from, and are redundant with the Illinois Public Land Survey System. ISGS, 1984 (revised 2003).


Illinois State Boundary

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Contains the Illinois state boundary in line and polygon format. There are two versions of the data: one that includes the official state boundary portion that extends into Lake Michigan, and one that depicts the state boundary in that area as the Lake Michigan shore line. There are no user-defined attributes. ISGS, 1984 (revised 2003).


Illinois Public Land Survey System (PLSS) Boundaries

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Illinois Public Land Survey System (PLSS) boundaries and designations in line and polygon feature classes. The polygon attribute data include meridian, township, range, section and county number (FIPS) designations. The line attributes indicate line type, including the state line, county lines, township and range lines, section lines, Indian treaty boundaries, base lines, principal meridians, and boundaries between areas mapped from different principal meridians. (ISGS, 2003).

THESE DATA HAVE POSITIONAL INACCURACY OF UP TO 600 FEET IN SOME AREAS OF THE STATE. THEY ARE NOT TO BE USED AT SCALES GREATER THAN 1:62,500. THE DATA ARE NOT APPROPRIATE AS A GEODETIC, LEGAL OR ENGINEERING BASE.


Illinois PLSS Townships

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Township and range lines of Illinois. Attribute information includes, township, range, meridian and line type indicators. ISGS, 1984 (revised 1998).


Indian Treaty Boundary Lines

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Indian Treaty boundary lines from the Illinois Public Land Survey System. ISGS, 1984 (revised 2003).


State Plane Zones

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Shows State Plane Coordinate System zones in Illinois. ISGS, 2007.


Universal Transverse Mercator (UTM) Zones

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Shows Universal Transverse Mercator (UTM) zones in Illinois. ISGS, 2007.


USGS Quadrangle Boundaries and Corner Points in Illinois

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Point, line, and polygon data that describe ideal USGS quadrangle boundaries and cornor points for quadrangles that intersect the state of Illinois. ISGS, 1992 (revised 1998). Includes line and polygon feature classes for each of the following scales/extents:

3.75-minute x 3.75-minute, commonly called quarter-quadrangles, typically used for a 1:12,000-scale index,
7.5-minute x 7.5-minute, the common USGS topographic sheet extent, typically 1:24,000-scale in Illinois,
15-minute x 15-minute, typically used for 1:62,500-scale index,
30-minute x 1 degree, typically used for 1:100,000-scale index,
1-degree x 2-degree, typically used for 1:250,000-scale index.