基于闭合等深线端点法提取河流深泓线方法的研究

Study on Algorithm of Thalweg Extraction Based on Closed Depth Endpoint Act Method

利用闭合等深线法提取深泓线时需通过等深线的高程建立等深线树,但由于等深线中存在地形要素的交叉和覆盖及获得等深线高程值时的误差等原因,使得原本闭合的等深线形成了断开、合并、孤立的对象及高程信息的丢失,根据这种对象建立的等深线拓扑关系连接得出的深泓线无法正确反应实际深泓点的拓扑关系。针对存在断开、合并、孤立的等深线时的情况,提出了利用加权邻接矩阵法建立等深线多叉树的方法。实践证明使用此方法保证了利用闭合等深线法提取出的深泓点之间拓扑关系的正确连接。

To extract thalweg from closed contour lines requires the establishment of contour tree according to the elevation of contours.However,due to intersecting andcoverage terrain contour elements and error while acquiring elevation values of contour and other reasons,the original closed contours become disconnected,merged,isolated objects,and elevation information is lost.The thalweg connected according to the topology of the contour line through these objects can not correctly reflect the actual topology of thalweg points.So for these situations when disconnected,merged,isolated objects exist,the method of using the weighted adjacency matrix to establish contour multi-tree is presented.