The initial data came from Spring 1995 Aerial Photography of McLean County. Aero-Metric Inc. of Sheboygan, Wisconsin produced digital data from that photography. Each government agency is responsible for additions and updates within their jurisdiction.

Recent color orthophotography was acquired in April 2001 by GRW Aerial Surveys of Lexington, Kentucky.

The MCGIS uses ArcGIS as its core GIS application. Data sets are ARC/INFO coverages. Data is also available in two CADD (Computer Aided Design Drafting) formats: Microstation .DGN files, and AutoCAD .DWG drawing files.

NO WARRANTY

These products are provided "as is". There is no guarantee or warranty concerning the accuracy of information contained in the data. No warranty is made, either expressed or implied, as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user.

LIMITATION OF LIABILITY

In no event shall any of the agencies mentioned above have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the data or arising out of the delivery, installation, operation, or user support.

PROTECTION OF PROPRIETARY RIGHTS

Reproduction or redistribution of the data or products derived therefrom outside of licensee's organization or entity is expressly forbidden. None of the data shall be electronically duplicated by any means for use by others, in whole or in part, without express written permission of the McLean County Regional Planning Commission. Resale of the data is prohibited. Agencies which are voting members of the McLean County GIS may produce these products for their own use as needed. All product sales are to be done through the McLean County Regional Planning Commission.

The McLean County data is based on the Illinois State Plane East Zone Metric Coordinate System. Vertical Control is based on National Geodetic Vertical Datum of 1929 (NGVD 29). Horizontal Control is based on the North American Datum of 1983 (NAD 83). The positional accuracy of the data from the Spring 1995 photography for the urban area is 0.5 meters and 1.0 meters for the remainder of the county.  It is the goal of the MCGIS Committee to equal or exceed this level of accuracy for new data and updates. It is the responsibility of the user to check the metadata for the accuracy of any particular spatial data layer. Download the ArcInfo Projection File HERE.