大规模航道实景三维建模关键技术方法

传统的航道测绘信息管理及融合技术应用不足，难以全面反映航道周边自然地理环境、设施设备分布及建构筑物对水上安全的影响。本文首先以大规模航道实景三维模型构建、优化与结构化处理为目标，针对航道水面实景三维模型破损、缺失问题，引入多尺度水平集影像分割方法。然后利用模型上空洞缓冲区影像自动初始化水平集模型，从而快速迭代分割得到准确的航道水域范围。最后进行水体实景三维模型重构优化与航标模型单体化提取。本文方法的有效性在重庆市长寿区长江王家滩示范段河段实景三维航道图建设任务中进行了验证，与传统手工修模和航标单体化处理方法相比，显著提升了航道实景三维模型优化效率，支撑了航道运行安全管理。

The key technology of large-scale channel reality 3D modeling

The traditional channel surveying and mapping information management and fusion technology is insufficient, and it is difficult to fully reflect the impact of the natural geographical environment, facilities and buildings on the water safety. Aiming at the problem of damage and missing of the reality 3D model of waterway, this paper introduces a multi-scale level set image segmentation method, that automatically initialized with the buffer image of hole, so as to obtain the accurate channel water area range by fast iterative segmentation, and further restrict the reality 3D model reconstruction and model singleization. This method is verified in the construction task of reality 3D channel map of Wangjiatan demonstration section of Yangtze River in Changshou District, Chongqing. Compared with the traditional model repairing and singleization method, the experimental results show that the technical method proposed in this paper is effective, which significantly improves the optimization efficiency of reality 3D model of waterway, and supports the safety management of waterway operation.