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地质剖面测量中,对于1:5万这类中等比例尺,一般求采用导线法成图。导线多沿溪沟、山谷布设,以避开通行上的障碍。这时,导线平面图为一条折线。用导线法测制地质剖面,视具体情况可用一次投影或二次投影作图。如果需要将不同方位的剖面投影到设计总方位(一般垂直岩层走向)上,于是就产生了所谓二次投影的问题。
Geological profile measurement, for such a 1: 50000 medium scale, the general requirements of the wire method of mapping. Wires and more along the ditch, Valley layout, in order to avoid obstacles on the road. At this point, the wire plan is a polyline. Geological section with the wire method of measuring the profile, depending on the circumstances available for a projection or secondary projection mapping. If you need to project the azimuths of different azimuths to the general orientation of the design (general vertical strike of the formation), then the so-called quadratic projection problem arises.