用精密三角高程测量代替二等水准测量方法的探讨

Discussion on the replacement of the second class leveling with precise trigonometric leveling

在工程测量的特殊条件下,可用精密三角高程测量代替二等水准测量,通常的作法是:将全站仪架在距离100m以内的适当位置(最大不宜超过150 m),使竖直角越小越好,且前后视距基本相等(前后视距差不宜超过2 m)。采用同一个高度不可调的专用棱镜。进行竖直角观测,可代替二等水准测量。

Under the particular conditions of engineering survey,the precise trigonometric leveling can replace the second class leveling.The usual practice is： mount the total station at appropriate location within the distance of 100m（not more than 150m at maximum）,make the vertical angle minimal,and ensure the front and rear sight distances basically equal（not over 2m）.Same-height-nonadjustable special prism is applied,and vertical angle observation can replace the second class leveling.