林区弯道的测设过程,有时会遇到交点的转角过大,障碍物多,E 或 T 丈量困难的复杂地形,相邻二直线交点 J_D,往往会延伸到山谷深处的上侧山坡上或山脊外侧很低的山坡下,或相交于难以到达的地点(如交点伸入河流、深沟、稻田、建筑物、高陡壁),使设站、测角、打椿都带来很大困难。 In the process of surveying and designing curved roads in forest areas, it is sometimes encountered that the corners of intersections are too large, there are many obstacles, and complex terrain with difficulty of measuring E or T, the intersection of two adjacent straight lines J_D will often extend to the upper slopes in the depths of the valley. On the hillside below or on the outside of the ridge is very low, or intersect in hard-to-reach locations (such as crossing into rivers, deep trenches, rice fields, buildings, high steep walls), so that set up stations, angle measurement, snoring all bring great difficult.