中文摘要：

二维电子海图是一种重要的数字产品，具有重要的商业价值和战略意义，针对二维电子海图内容完整性和版权保护验证缺乏相应支撑技术的问题，为提高其水印技术的实用性，依据电子海图数据组织结构特征和空间结构特征，采用阈值灵活控制水印算法对地图内容的扰动，提高了水印嵌入操作的低扰动、高鲁棒要求，同类方法测试对比，该算法具有更好的低误码率，在抵抗数据压缩，曲线拟合等常见地图攻击方面，具有更好的抵抗性能。

英文摘要：

Two-dimensional electronic charts are an important type of digital products with crucial implications in terms of commerce and strategy. In order to improve the content integrity of 2D electronic charts and enhance tech-nical support to the copyright verification issue, duple features in data origination and space structure are integrated into the current system and the method that adopts threshold to control watermarking flexibly is adopted to reduce the disturbance to mapping. Compared with similar studies, the proposed method enhances the performance of map-ping with less distortion and higher robustness. Furthermore, it shows lower error coding rate and much higher abili-ty of resistance towards compression, curve fitting and other digital attacks in mapping.