用免仪高、目标高同时对向三角高程观测法替代二、三等水准测量的研究
용면의고、목표고동시대향삼각고정관측법체대이、삼등수준측량적연구
Study on Replacing Second and Third Order Leveling by Subtending Simultaneity Observation of Trigonometric Leveling without Height of Total Station Instrument and Its Goal