Abstract
Electromagnetic induction (EMI) and global positioning system (GPS) data were used with geographical information system (GIS) to improve a high intensity soil survey that was completed with traditional methods in northwest Illinois. Apparent conductivity (ECa) maps provided additional layers of information, which improved knowledge of soils and directed soil sampling. The information provided by ECa maps and additional soil sampling led soil scientists to recognize different soils and modify mapping concepts. Within the site, ECa maps assisted the identification and delineation of soil polygons and improved the quality of the high-intensity soil map. White spatial ECa patterns influenced the judgments of soil scientists, ECa maps were not accepted as a substitute for a high-intensity soil map.
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