def lat2zone(lat):
 zone = int(round(((lat / 8.0) + 9.5)))
 return 'CDEFGHJKLMNPQRSTUVWX'[zone]

def lat2zone ( lat ) : zone = int ( round ( ( ( lat / 8.0 ) + 9.5 ) ) ) return 'CDEFGHJKLMNPQRSTUVWX' [ zone ]
convert longitude to single-letter utm zone .