摘要
借鉴不同椭球间坐标转换的思路,将格网坐标转换法应用于矢量数据平面精度的脱密。采用格网坐标转换法进行脱密时,将随机点作为重合点,生成随机数作为偏移量,保证了偏移量具有很强的随机性。根据脱密数据的范围和格网间距确定格网点的数量,采用移动转换法计算每个格网点的偏移量,使得格网之间具有不同的偏移量,从而保证脱密后的数据具有很好的抗攻击性。通过实验和分析证明,相邻格网之间的偏移量变化较平滑,对矢量数据几何图形进行脱密后能保持拓扑关系。
Inspired by the method of coordinate conversion between different spheroids,we applied grid coordinate transformation method to de-crease vector data horizontal accuracy.When using grid coordinate transformation method for decryption,we took random points as control points and random numbers as offsets,which ensured that the offsets had strong randomness.We determined the number of grid points according to the extent of decrypted data and grid size and used the moving and transforming method to calculate the offset of each grid point,so that there are different offsets between the grids to ensure the decrypted data have good confidentiality.After experiments and analysis,we found that the offset changes between adjacent grids were relatively smooth,and the topological relationship was maintained after vector data decryption.
作者
张寿选
ZHANG Shouxuan(Fujian Provincial Geomatics Information Center,Fuzhou 350003,China)
出处
《地理空间信息》
2022年第3期88-91,共4页
Geospatial Information
关键词
格网坐标转换法
矢量数据
平面精度
脱密
反距离权重插值法
grid coordinate transformation method
vector data
horizontal accuracy
decryption
inverse distance weighted interpolation method
