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三角高程测量是古老的测高方法。七十年代以来,随着光电测距仪的发展,由测站向目标点观测斜距和天顶距(或竖直角),计算它们之间的高程差,建立高程控制的方法普遍在生产中应用。实践证明,这一方法可以代替某些等级的工程水准测量,显示了它的优越性,可以大大减轻内外业工作。 根据《铁道测量技术规则》第三篇隧道测量规定:隧道两开挖洞口问路线长度为13～36公里时须按三等水准测量要求测定高程控制点。大瑶山隧道地面控制测量引用了DM501型
Triangle elevation measurement is the ancient method of altimetry. Since the 1970s, with the development of photoelectric range finder, the elevation of the slant distance and the zenith distance (or vertical angle) are observed by the station to the target point, and the elevation difference between them is calculated. The method of establishing elevation control is generally used in production In the application. Practice has proved that this method can replace some level of engineering leveling, showing its superiority, can greatly reduce the work inside and outside the industry. According to the third chapter of “Technical Regulations for Railway Survey”, tunnel measurement stipulates that elevation control points shall be determined according to the third-level leveling requirements when the length of the route between two tunnel openings is 13-36 km. Dayaoshan tunnel surface control measurements reference DM501 type