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其次，针对基于属性特征的无损数字水印算法在抵抗常见的地图编辑操作时鲁棒性能较弱的不足，提出了基于空间特征的数字矢量地图水印算法。
Secondly, a digital watermark algorithm based on spatial characteristic has been discussed for the weakness of the first algorithm in resisting attacks of traditional map operations.
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