proj4.defs("EPSG:8103","+proj=tmerc +lat_0=42.9180555555556 +lon_0=-88.0638888888889 +k=1.00003738 +x_0=120091.4415 +y_0=0.003 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs");