n. altimetry
... altimeter测高计 altimetry高度测量术 altitude高度 ...
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高精度测量技术 accurate measurement technology
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因为三角测量和三边测量术观察没有包括第三方面的信息，所以介绍余下的站台的椭圆体高度作为观测参量。
Since the triangulation and trilateration observations do not contain much information in the third dimension, the ellipsoidal heights of the remaining stations are introduced as observed parameters.
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