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(五)谈谈下面几个问题1.图上定线问题。越岭公路,如级别不高,就地直接定线,较省时间,一般都是这样进行的。但也有主张在遇到复杂山形时,应先测地形,在图上定线。前面谈过,在当前修建公路条件下,测绘地形(还未采用航空测量方法),工作量大,时间长。且图上定线,在搬到地面时,尚须做不少工作,倘所测地形不够准确,图上路线不能照样定到地面上。直接定线,通过实地观测,更能切合实际。低级的公路,各项指标不高,一般直线不长,这就便于直接定线。至于山形复杂,只要勘查工作做得细致,就能找出最正确的路线。而测量复杂山岭地形,既要求准确,工作更属繁重。
(E) to talk about the following questions 1. Figure alignment problem. Crossing the highway, such as the level is not high, the direct alignment on the spot, save time, generally are like this. But there are also claims that in the face of complex Yamagata, should first measure the terrain, the alignment in the map. As mentioned earlier, under the current conditions of constructing roads, surveying and mapping the terrain (aviation measurement methods have not been adopted yet), it takes a lot of work and takes a long time. And the map alignment, when moved to the ground, still have to do a lot of work, if the measured terrain is not accurate enough, the figure can not be set to the ground on the same route. Direct alignment, through field observations, more realistic. Low-grade roads, the indicators are not high, the general straight line is not long, which facilitates direct alignment. As Yamagata complex, as long as the exploration work done carefully, you can find the most correct route. The measurement of complex mountain topography, both require accurate, work is more heavy.