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A Geographic Information Systems (GIS) is a computer-based tool for mapping and analyzing things that exist and events that happen on earth. GIS allows integration of all types of data based on the geographic component of the data. GIS technology combines common database operations such as query and statistical analysis with unique visualization and geographic analysis benefits. GIS is a powerful tool for governments and businesses to make informed decisions based on the "big picture" of related data. GIS is not an automated decision making system, but a tool to query, analyze, and map data in support of the decision making process.
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Prices for GIS data vary. View our GIS pricing guide (PDF). If you would like additional information or costs associated with available maps and date, please contact a GIS staff member at 309-558-3772 or by emailing Josh Boudi.
The Geographic Information Systems (GIS) Department is responsible for the development, maintenance, integration and training of GIS software applications and data layers. Primary duties include maintaining tax parcel maps, assigning new property addresses, developing internet mapping applications and creating a wide range of customized maps. Programming and maintenance of the County's website is also handled within the GIS Department.
Some common data layers used by Geographic Information Systems (GIS) include parcels, streets, zoning, land-use, census data, soils, taxing districts and aerial photography. Commonly requested maps include fire protection districts, voter precinct boundaries, traffic and crime statistics, zoning boundaries and parcel overlays with aerial photography.