error of closure in leveling 水准闭合差 ; 水准测量闭合差
This idea is very novel and only our company has the patent. It was avoid human error in manual leveling, save the time and really did it once and for all.
这个思路非常新颖，国内只有我们公司有这项专利，免去手动调平的各种繁杂以及人为误差，节约了时间，真正做到了一劳永逸。
The effect of atmospheric refraction error on observed value is a very thorny problem in EDM trigonometric leveling.
在光电测距三角高程测量中，大气折光对观测量的影响是一个非常棘手的问题。
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