测站数BM1 -0.137-0.001 -0.138 53.275 BM2 53.137 0.033-0.001 0.032 -1.244-0.002 -1.246 0.61-0.001 0.609 BM3 52.532 0.275-0.001 0.274 BM4 52.806 -0.849-0.001 -0.85 -0.542-0.001 -0.543 0.993-0.002 0.991 BM5 52.404 0.315-0.001 0.314 BM6 52.718 -1.361-0.001 -1.362 -0.436-0.001 -0.437 -0.898-0.001 -0.899 0.537-0.002 0.535 -0.509-0.001 -0.51 BM8 50.045 -0.108-0.001 -0.109 49.936