中文摘要：

针对工程建设中为满足相应的测量精度要求而进行的独立坐标系选择相关研究不足的现状,该文阐述了高斯投影长度变形计算原理,基于数字高程模型绘制的断面图和高斯投影长度变形适用范围曲线的套合,提出了一种独立坐标系选择方法。试验结果表明本文提出的方法是可行的,能够对各种投影长度变形要求的独立坐标系选择提供参考。

英文摘要：

In order to improve the invisibility of the GIS vector data during transmission, this paper realized a scrambling transformation of GIS line/polygon layer vector data based on Sierpinski Gasket technology, by the scrambling process in the position of each point in the point set. It defined the positive correlation between the scrambling effect and the fractal dimension based on the degree of scramb ling. Experimental result showed that the method would keep the effective data format and the overall shape similarity with good invisibility and confusing, which could effectively protect the security of vector geographic data in the data transmission, data hosting services and packing storage under the premise of processing efficiency and hidden application requirement.