Optimum design of network adjustment is indispensable before carrying out the adjustment.
在网平差前，对平差网进行优化设计是必要的。
The numerical partial derivative is introduced to simplify the GPS network adjustment model.
采用数值微商求偏导数的方法，从而使GPS网平差的计算模型非常简洁。
Leveling-network condition adjustment is a useful adjustment method for leveling-network adjustment.
水准网条件平差是水准网平差的一种常用方法。
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