地形校正是扭秤勘探各种校正中的一种,野外水准测量是地形校正的第一步,他的任务是测出扭秤观测点周围地形高低。一、用未改进的标尺工作情况;1.把普通标尺放在图1的O点上,读出标高(前视);2.再把普通标尺放在图1的0度n_1n_2……n_8,45° Topography correction is one of the various calibrations of torsion scale exploration. Field leveling is the first step of topographic correction. His task is to determine the topography of the surrounding area of ​​the torsion scale observation points. First, the use of unobstructed ruler work; 1 ordinary ruler on the O point in Figure 1, read the elevation (foresight) ;. 2 and then put the ordinary ruler in Figure 1 0 degrees n_1n_2 ...... n_8, 45 °