proj4.defs("EPSG:31900","+proj=tmerc +lat_0=0 +lon_0=48 +k=0.9996 +x_0=500000 +y_0=0 +ellps=GRS80 +towgs84=-20.8,11.3,2.4,0,0,0,0 +units=m +no_defs +type=crs");