proj4.defs("EPSG:8100","+proj=tmerc +lat_0=43.4202777777778 +lon_0=-88.8166666666667 +k=1.0000333645 +x_0=185013.970942342 +y_0=0.00701041402082804 +ellps=GRS80 +towgs84=-0.991,1.9072,0.5129,-1.25033e-07,-4.6785e-08,-5.6529e-08,0 +units=us-ft +no_defs +type=crs");