以下为句子列表：
英文: A description is made of the problems encountered in GPS leveling measurement in this field and countermeasures.As observation of ground subsidence is made through measuring the relative movement of the observation stations,it is proposed to base the subs
中文: 介绍了GPS水准测量中的若干问题及其解决方法，结合开采沉陷监测需要的是相对变化量的特点，为避免坐标转换造成的精度损失，提出了开采沉陷观测中的下沉值可应用大地高的变化量代替的方法，并对其精度及可靠性进行了实例验证。
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