A method of seafloor geographic entity boundary recognition based on D-P algorithm and optimal path
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摘要: 海底地理实体的划定与命名是当前国际海洋权益领域的热点研究问题之一。然而，由于海底地理实体边界的量化界定技术缺乏，导致其界线确定不可避免地存在人为性，为此，本文提出了一种基于D-P算法和最优路径的海底地理实体边界划定方法。将高分辨率水深模型转换为二维水深矩阵，从横向与纵向进行剖面分析，采用极值点简化和D-P算法进行二次简化的方法，通过坡度变化定位和基部高程定位等基本条件综合判断，从而实现了单体海山的山体与其基部的自动划分；在此基础上，采用路径寻优的方法实现了连体型海山的自动分割。该方法在南海海底地理实体划定中进行了验证，取得了良好的应用效果。Abstract: The delimitation and naming of seabed geographic entities is one of the hot research issues in the field of international maritime rights and interests. However, due to the lack of quantitative definition technology for the boundaries of seabed geographic entities, the determination of the boundaries is inevitably artificial. For this reason, this paper proposes a method for the boundary delineation of seabed geographic entities based on the D-P algorithm and optimal path. Convert the high-resolution bathymetry model into a two-dimensional bathymetry matrix, conduct cross-section analysis from the horizontal and vertical directions, and use extreme point simplification and D-P algorithm for quadratic simplification. In this way, the automatic division of the mountain body and its base of a single seamount is realized; on this basis, the method of path optimization is used to realize the automatic segmentation of conjoined seamounts. The method has been verified in the delineation of seabed geographic entities in the South China Sea and achieved good application results.
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Key words:
- geographical entity /
- foothills /
- D-P algorithm /
- path optimization /
- boundary recognition
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图 1 海山等高线示意图（a）和连体海山及垭口处地貌图（b）
Fig. 1 Schematic diagram of seamount contour (a) and geomorphic map of conjoined seamount and pass (b)
图 2 D-P算法流程示意图
图a，b，c和d为剔除冗余点步骤
Fig. 2 Flow diagram of D-P algorithm
Figures a, b, c and d are the steps of eliminating redundant points
图 5 典型地形剖面及识别山脚点过程图
Fig. 5 Typical topographic profile and process diagram of identifying mountain foot points
图 6 研究区域
图中五角星为选定的地理实体位置
Fig. 6 Study area
Where pentagram is the location of the selected geographical entity
图 8 坐落于海盆区的典型海山界线划定示例
Fig. 8 Example of delimitation of typical seamount boundary located in the sea basin area
图 9 坐落于陆坡区的典型海山界线划定示例
Fig. 9 Example of delimitation of typical seamount boundary located in the land slope area
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