International research on the digitalization of levelingsurvey started from 1980s.
国际上对水准测量数字化的研究起始于上个世纪80年代。
2
But it is not easy to realize the digitalization of levelingsurvey because of its owner properties.
但由于水准测量本身的特点,要实现水准测量的数字化并不容易。
3
There are a lot of shortcomings in traditional optical levelingsurvey. It includes too intensive labor, low efficiency and difficult afterward data processing.