In summer 1995, CHAART staff worked with Dr. Durland Fish (Yale University School of Medicine) to use RS/GIS to design a tick sampling strategy in a portion of northwest Indiana. This activity was part of a study that was funded through a grant from the CDC. Landsat Multispectral Scanner (MSS) data were classified to produce a map showing the location of woodlots, and GIS functions were used to separate these woodlot s into three size categories. This product allowed Dr. Fish and his colleagues to investigate the relationship between forest patch size (22K) and abundance of Ixodes scapularis, the vector of Lyme disease. The results were reported at the 1995 meeting of the Society for Vector Ecology.