proj4.defs("EPSG:8171","+proj=tmerc +lat_0=41.4111111111111 +lon_0=-90.8 +k=1.0000349452 +x_0=242316.4841 +y_0=0.01 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs");