GPS水准无法直接应用于跨障碍高程传递，其关键原因在于障碍物两侧的高程基准不一致。
The reason why GPS leveling cant be used for height transfer across obstacle is that the height datum of both sides of obstacle is not consistent.
根据以上设想进行的研究试验表明，“天文GPS水准”克服了单纯GPS水准无法连接不同高程系统的困难，对于远距离跨障碍高程传递是一种有效的高精度方法。
The study and experimentation based on the above thought show that GPS astronomical leveling is an effective and high precision method for height transfer across obstacle with long distance.
详细介绍了光学测微法跨江水准测量方法、场地选择、场地布设、砚板制作、观测方法、记录格式等内容。
This paper introduced the field selection, field planning, vane production, observation methods, and record format of river-crossing leveling in detail.
研究结果表明：天文GPS水准方法是一种远距离、高精度跨障碍高程传递方法。
The results show that GPS astronomical leveling is an effective method for height transfer across obstacle at a long distance with high precision.
长距离跨河水准测量是特大跨径桥梁建设中高程控制的一项重要内容。
Long distance river-crossing leveling is an important job in the elevation control of the long-span bridge construction.
长距离跨河水准测量是特大跨径桥梁建设中高程控制的一项重要内容。
With the rapid development of Chinas traffic, more and more long-span bridges are needed to be constructed.
长距离跨河水准测量是特大跨径桥梁建设中高程控制的一项重要内容。
With the rapid development of Chinas traffic, more and more long-span bridges are needed to be constructed.
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