电磁波测距三角高程代替四等水准测量

Electormagnetic distance measuring methed by triangle altitude replacing four grade levelling

电磁波测距三角高程代替四等水准测量，是解决山区测绘中高程控制网布设的有效方法。近年来，先后在１０多个工程测绘项目中应用这一技术，进行了高程控制网布设，取得了大量实测成果。通过分析研究，证明电磁波测距三角高程在采用往、返观测时，其高差中数完全达到四等水准精度要求，能够代替四等水准测量。

Electromagnetic distance-measuring method by triangle altitude replacing four grade levelling is an effecient method to solve the arrangement of altitude control net in mountain survey. In recent years, This technology has been applied to more than ten survey projects, making the arrangement of altitude control net, getting a large number of positive results. Through analysis and reseach, it is proved that this measuring method, when to and fro survey is adoped, its mid-values of altitude differences fully fulfil the accuracy requirements of four grade levelling, can replace the four grade levelling. [