A Watermarking Algorithm for Vector Data Based on Spatial Domain

In recent years, digital maps are used more and more widely, it plays a significant role in the national economy and defense construction, illegal duplication and distribution or forgery of the maps is also easy. Digital watermarking algorithms for vector data are an efficient method to counter such abuses of the maps. Considering the characteristic of vector geo-spatial data for digital watermarking, this paper analyzes current methods of watermarking for digital vector geo-data and presents a new robust blind watermarking approach. The proposed algorithm starts with the area subdivision, then watermarking was embedded into length of vector by changing some x coordinate or y coordinate. The experiments show that the proposed algorithm could effectively resist the attack of noise, removing points, adding points, deleting points and so on.