基于双线性内插模型的地理空间数据保密技术研究

由于地理空间数据具有一定的保密性,不能直接应用于社会公众服务,只有对地理空间数据采取一定技术手段进行保密处理,才能保证数据安全。本文介绍了一种基于双线性内插模型的格网法坐标保密技术,分别对每个格网内要素的节点坐标进行偏移,由于每个格网偏移的参数不同,改变了每个要素节点的绝对坐标和相对坐标,脱密程度较高,且不可逆。通过实际应用证明,该方法有效地实现了地理空间数据的脱密,同时,满足了社会公众对地理空间数据的应用需求。

Research on the Security of Geospatai l Data Based ont he Bilinear Interpolation Model

Due to the geographical spatial data has a certain degree of confidentiality, usually not applied directly in the public serv-ice, only for Geo spatial data take certain technical measures for confidential treatment, in order to guarantee data security.This paper introduces a based on bilinear in model of grid coordinates security method, to offset the factors in each grid node coordinates respec-tively, due to the different parameters of each grid offset, changing the absolute coordinates of each element node and a relative coordi-nate, close off the high degree and irreversible.Through the practical application, this method can effectively achieve the geographic space data's de dense purposes, and meet the social public application needs of geospatial data.