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在地方道路的测量工作中,由于缺乏仪器,所以采用量距法来测定偏角是有现实意义的。在“怎样测量简易公路”(人民交通出版社出版)一书中,系采用自交点桩沿两切线各量5公尺得出甲乙长度b(原文为A),查出偏角(如图1)。偏角与甲乙长度b是余弦关系: Cosα=0.5b/5=0.1b Cosθ=2Cosα笔者建议利用正弦关系来求偏角,这样更可以比较正确地量出控制的长度(如图2)。自切线方向量5公尺得甲点;由甲点通过交点再延长5公尺,得丙点。自交点沿切线方向量5公尺得乙点。实量乙丙间长度为a
In the local road measurement work, due to the lack of equipment, so the use of distance measurement method to determine the angle is of practical significance. In the book “How to Measure Simple Road” (People’s Traffic Publishing House), a length of b and a (length: b) ). The declination angle and the length of arm A and b are the cosine relations: Cosα = 0.5b / 5 = 0.1b Cosθ = 2Cosα The author suggests to use the sine relation to find the declination angle, so that the control length can be more accurately measured (as shown in Fig. 2). 5 meters from the tangential direction to get a point; from point A through the intersection point and then extended 5 meters, to be C point. Since the point of intersection along the tangential direction 5 meters to get B point. The actual length of ethylene oxide between a