proj4.defs("EPSG:9837","+proj=tmerc +lat_0=0 +lon_0=23.5 +k=1 +x_0=300000 +y_0=0 +ellps=krass +towgs84=25,-141,-78.5,0,-0.35,-0.736,0 +units=m +no_defs +type=crs");