Whether elevation abnormality models are built properly has great effects on the precision of GPS level elevation survey.
高程异常模型的建立是否合适，对GPS水准高程测量的精度产生重要影响。
So it's always a hot topic how to transform GPS ellipsoidal height into level elevation and to keep certain accuracy.
如何将GPS大地高转化咸水准高程，并使其保持一定的精度，一直是人们研究的热点。
The advanced GPS technology shows good potential to replace traditional land level for elevation measurement in agricultural land levelling project.
在农田土地平整作业中，利用先进的GPS技术替代传统的人工水准仪测量方法对田面高程进行测量具有较好的可行性。
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