The method of arc-length parameter space provides a good solution for the surface grid of complex geometry contour, and establishes the foundation for the further analysis carried out.

该方法为具有复杂几何外形的物体表面网格的生成提供了一个便利的途径，也为进一步生成三维空间网格奠定了基础。

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The contour size changes of rail before and after straightening, involving width of rail head, rail height and rail length, were measured. The causes of rail height decrease were analyzed.

测定了矫直前后钢轨外形尺寸变化(包括轨头宽度、轨高、钢轨长度)，分析了轨高减少的原因。

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The comparison of the compression efficiency between the new method and those of the contour encoding and one-dimensional run length encoding is also made.

同时，给出了编码和译码的算法，并且与等值线编码和一维行程编码的压缩效果进行了比较。

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