In ensuring the content of digital vector maps lossless

a high-capacity digital watermarking algorithm is proposed based on encoding scheme.According to the structure of TAB file for digital vector maps

the watermark is hidden into the attribute blocks.As each vector object definition reserves redundant space

these information bits cannot be edited and displayed by any map editing tool

the watermark has good concealment.Experimental results show that the algorithm maintaining high capacity and good invisibility

it also can strongly resist various geometric transformations such as cropping

rotation

projection

etc.