等高线与水网数据集成中的匹配及一致性改正

The Matching and Consistency Correcting in the Integration of Contour and River Network

等高线作为地势起伏与地形凹凸特征的表达,与水网表达有着密切的约束关系。在空间数据库集成与匹配中,由于来源不同,这两种数据往往出现不一致,导致水网"爬坡"现象。针对该问题提出一种等高线与水网匹配及一致性改正方法,利用Delaunay三角网模型在等高线基础上通过弯曲分析提取地形特征,基于河流分布与谷地走势的相关性,建立水网与等高线间的匹配关系,进而识别两者间的一致性。在此基础上利用仿射变换等几何方法完成一致化操作,包括水网移位匹配等高线和等高线移位匹配水网。

As the representation of terrain surface and height information,the contour data has the strict constraint relationship with the distribution of river network.In spatial data integration and matching,the inconsistency usually occurs between the river network and contour generating ＂river climbing slope＂.This study presents a method to build the matching relationship and to correct the inconsistency between river network and contour data.Based on Delaunay triangulation,the terrain landform features are extracted and by bend analysis build the matching relations between river network and contour.According to different inconsistency situations,two correction approaches are put forward depending on which data is precise,which includes the river network displacement referenced to the contour and the opposite.