一个非常棒的二维等值线绘制程序，采用双三次曲面拟合算法，得到的等值线非常光滑，相比其它我所见的到的追踪等值线算法加平滑结果得到的等值线质量高出很多。-A great two-dimensional contour mapping procedures, the use of bicubic surface fitting algorithm, the contour lines to be very smooth, compared to the other I can see that the