针对四边形单元内电流的插值，推导出一组双线性插值计算式；
On the basis of the current interpolation of the quadrangle elements, this paper develops the computing expressions for bidirectional linear interpolation.
首先，实现了三角形双线性内插算法并应用于纵断面获取。
Firstly, the algorithm of triangular bilinear interpolation is shown in detail and applied to acquire the profile from TIN.
首先，实现了三角形双线性内插算法并应用于纵断面获取。
Firstly, the algorithm of triangular bilinear interpolation is shown in detail and applied to acquire the profile from TIN.
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