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一九五三年第五测量队,在陕北测量无定河水土保持区测量时,因地形复杂,三角点用直接水准很困难,所以采用了三角水平测量。在完全四边形销上,每隔四个或五个图形,用直接水准连接一次,以作三角水平之起算数据。三角水平是采用不同时交互观测而用同时交互观测公式计算的,在观测的时间上也没有严格的限制,并且这种计算是由
In 1953, when the Fifth Surveying Teams measured the water and soil conservation zone in the Wuding River in northern Shaanxi, it was difficult to use the direct water level at the triangle because of the complex terrain. Therefore, the triangular measurement was adopted. On a full quadrilateral pin, every four or five graphics, with direct level connection once, for the triangular level of the starting data. Triangular level is not observed at the same time using the simultaneous observation of interactive observation of the formula, there is no strict time limit in the observation, and this calculation is from