proj4.defs("EPSG:8101","+proj=tmerc +lat_0=42.5694444444444 +lon_0=-88.225 +k=1.0000346179 +x_0=208788.418 +y_0=0.0034 +ellps=GRS80 +towgs84=-0.9738,1.9453,0.5486,-1.3357e-07,-4.872e-08,-5.507e-08,0 +units=m +no_defs +type=crs");