分析了在适当的边界条件和约束下三次多结点样条插值的逼近阶；
The approximation order of the interpolation with the appropriate boundary conditions and constraints is analyzed.
为了在稀疏规则条件下能有好的插值推理结果，提出了一种相似插位推理方法。
In order to get better result when rule base is sparse, we propose a similarity interpolative reasoning method which can keep the convexity and normality of the reasoning result better.
与各向同性相比，碱解氮在各向异性条件下克里金插值精度提高了42.8%。
Precision of the Kriging interpolation of alkalytic N was improved by 42.8% considering anisotropy of spatial variability.
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