An Multiple Watermarking Algorithm For GIS Vector Data

GIS vector data is a valuable source and extremely important information It is not onlycostly and acquisition, but also plays an important role in the military, navigation, etcMeanwhile, the GIS vector data is easily copied, transmitted, making the aid of digitalwatermarking technology to protect its copyright GIS vector data security becomes animportant research direction.Currently, digital watermarking technology in data security and copyright protection hasbeen more and more attention and research scholars. Although the research results emerging,but still can not solve the urgent problem to be solved. As one of the new technologies fordata security, multiple digital watermarking technology has a huge business potential,It is agood means in digital product trading tracing, copying good means to control, certification ofownership. Therefore, the study of multiple GIS vector data watermarking technology hasimportant significance.Based on the current research and analysis of GIS vector data single value watermarkingalgorithm, This paper combined with the features of GIS vector data conducted in-depthresearch for GIS vector data multiple watermarking algorithm. The main contents of thispaper are:(1)Describes the definition of digital watermarking technology, features, classificationand application. Analysis of the research status of GIS vector map a single value of digitalwatermarking technology, summarizes the advantages and disadvantages of the currentsingle-valued watermark algorithm.(2) First, a detailed analysis of the current mainstream vector data digital watermarkingtechnology and multiple watermarking technology, then combining the characteristics of GISvector data presented two modes in GIS vector data embedding multiple watermarksembedded that focused on the position of the watermark embedding and embedding rules.(3) This paper focuses on the exploratory experiment the combination of two modes, andfind out which is better algorithm. By designing an example to verify the feasibility of thealgorithm. Thus proposed multiple watermarking algorithm based on GIS vector data, designand implement algorithms.(4) we evaluated the algorithm from the above in two aspects about data quality androbustness.The results show that the algorithm has better visibility, also within data accuracyerror threshold; multi watermark is robust, but also to achieve the blind watermark extraction.