This paper introduces an adaptive watermarking algorithm for DEM. This proposed method can utilize human visual system(HVS)

features of DEM data and discrete Fourier transform(DFT) to determine adaptively the location where the watermark can be hidden. And then

the watermark information is added to the lowness frequency of the texture region DFT. Experimental results show that the novel watermarking scheme for DEM has good imperceptibility

little effect on DEM accuracy and is robust to noise attack.