中国还在经纬仪附近发射了气象气球来测量大气温度和压力变化，以更好地估计折射误差。
The Chinese also launched weather balloons near their theodolites to measure atmospheric temperature and pressure changes to better estimate refraction errors.
电子经纬仪是目前应用较为广泛的角度测量仪器，按其角度测量原理可分为增量计数法和绝对编码法。
At present electronic theodolite has been used widely in Angle measuring, according to the Angle measuring principle can be divided into incremental counting method and absolute coding method.
为了保证外弹道的测量精度，就应对光电经纬仪的测量精度进行合理设计。
In order to measure ballistic trajectory accurately, the measurement precision of the photoelectric theodolite should be investigated.
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