基于弱水印的地理数据拓扑完整性检验方法

拓扑关系是空间关系研究的基础问题,被广泛应用在空间查询和空间推理等方面。为了检测地理数据拓扑关系的完整性,提出了一种基于弱水印的地理数据拓扑完整性检验方法。通过地物之间空间相离距离生成水印信息,并修改其相离距离比值,根据比值进行地物缩放以达到嵌入水印的目的。在水印检测时,根据生成的水印与提取的水印的匹配结果来判定地理数据的拓扑完整性。实验结果表明,本方法可以有效地检测出矢量地理数据的拓扑完整性。

Checking Topological Integrity of Geographic Data Based on Fragile Watermarking

Topological relation is the basis of spatial relationships,which is widely used in spatial query and spatial reasoning.In this paper,a fragile watermarking method was proposed to verify the topological integrity of geographic data.The watermark is generated from the disjoint distance between the objects.Then the objects are zoomed in or out according to the modified disjoint distance rate based on the watermark to embed the watermark.In watermarking detection,the topological integrity of geographic data is determined by the result of matching the regenerated watermark with the extracted watermark.Experimental results demonstrate that it is effective to verify topological integrity of geographic data by the method.