Because of complex landform and big differenceofelevation, transmission line in mountain area has its characteristics which are different form transmission line in common landform.
The conditions of complicated topography and great differenceofelevation are often met during water and hydroelectric surveys. So it is difficulty to carry out geometric elevation.
在水利水电测量中,常常遇到地形复杂,高差变化大的情况。
3
Its application range, i. e. great elevationdifference and bad condition of foundation, are pointed out.