送电线路勘测设计；
与以往不同，在今后的输电线路勘测中，需要获取塔位的绝对坐标会成为一种常态。
With the former dissimilarity, it will become a kind of normal which we need obtain the tower coordinate value in the circuit survey in the aftertime.
山区送电线路因其地形复杂、相对高差大，在许多方面都具有不同于普通地形送电线路的特点，对设计工作和勘测工作有更高的要求。
Because of complex landform and big difference of elevation, transmission line in mountain area has its characteristics which are different form transmission line in common landform.
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