然后介绍了空间拓展要用到的方法——空间内插方法。
Then introduces the spatial interpolation method that is used to spatial expand.
结点上的变量值采用时间序列回退内插的新的插值格式，而不是传统的空间内插方法。
The interpolations are made along the time-line with varying reach-back time distance, rather than the more widely used spatial interpolations.
结果表明：在台站分布密集的区域不同空间内插方法之间差异较小，在台站分布稀疏的区域则差异较大；
The results show that biases of different methods are very small in the dense data area and obvious in the sparse data area.
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