在山地、高山地以视距法施测大比例尺(1∶500～1∶5000)地形图,由于立角过大,对测距精度和高程精度有极大的影响。当无其他影响情况下,视距仪测距之精度是:ms=(1/36.5V)S……(1)如望远镜放大倍率 V 为25倍,距离 S=100米时,则视距误差 ms 仅0.2米。但一般常难达此精度。特别 In the mountainous and mountainous areas, the large scale (1: 500 ~ 1: 5000) topographic maps are measured by the method of line-of-sight, which has a great influence on the accuracy of ranging and elevation due to the oversize angle. When there is no other influence, the accuracy of range finder is: ms = (1 / 36.5V) S ...... (1) If telescope magnification V is 25 times and distance S = 100 meters, ms only 0.2 meters. But often difficult to reach this accuracy. especially