AGRICOLA IND 90047157; Paper presented at the 1988 Winter Meeting of the American Society of Agricultural Engineers, December 13-16, 1988, Chicago, IL., St. Joseph, MI: American Society of Agricultural Engineers, 1988. 36 p. (Microfiche Collection fiche no. 88-1606), A key to the adoption of spatially variable or site specific farming methods will be the ability to examine and analyze information. Geographic Information Systems (GIS) are computerized systems designed to manage mapped data. A survey of microcomputer based GIS was performed. Nineteen GIS systems were summarized. (original)