The mathematics required for more sophisticated treatment of downward continuation is beyond the level of this book .
对于向下延拓更完善的论述所需要的数学已越出本书的范围。
The results show that the stable downward continuation program has higher accuracy and stability than other single method.
结果表明，稳定下延方案较单项的其他下延方法具有更高的精度和稳定性。
Aeromagnetic data downward continuation to sea level instead of Marine magnetic survey data can improve use capability of survey data.
采用航磁数据向下延拓到海面代替船测数据，可提高磁力测量成果的综合利用率。
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