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林区公路实用选线法,能在外业恰当地处理线路纵、平、横三者之间的关系,从而定出一条合理的线路。在地形复杂地段,该法更有其优越性。但该法需增加人员和仪器,且选线速度较慢。为此,提出以下改进和补充意见: 1.除特殊困难地段外,不用经纬仪选线。用木制圆盘仪(可读至30′)测偏角、定方向;用带角手水平仪放坡。首先确定控制点(如悬崖、陡坡、凹陷、特殊地质地段等)的填挖高值(至0.5米)。记入该法
The practical route selection method for forest roads can properly handle the relationship between vertical, horizontal and horizontal lines in the field so as to set a reasonable route. In the complex terrain, the law has its advantages. But the law needs to increase personnel and equipment, and the slow line selection. To this end, proposed the following improvements and additional comments: 1. Except for special difficult locations, do not use theodolite alignment. Using a wooden disc instrument (readable to 30 ') declination angle, set the direction; with a graticule grading. First, determine the height of fill and ditch (up to 0.5 m) at control points (such as cliffs, steep slopes, depressions, special geological formations, etc.). Credited to the law