大流域DEM的地形结构线的提取方法研究

Study on Extracting Characteristic Line of Terrain from Large Drainage Basin DEM

针对大流域DEM数据的存储,地形结构线的快速提取已成为数字流域中重要的问题,探索了一种分块存储、分块读取大流域DEM数据的方法,同时重点研究解决了大流域DEM数据的存储方法、单个子DEM数据的快速地形线的提取及大流域DEM地形数据的合成问题。在此基础上提出了处理孤立点的问题。实现了大流域DEM数据的地形结构线的快速提取。

The storage of large drainage basin DEM data and the quick extraction of terrain structure line become very important in digital basin. This paper makes a study on blocked storage and blocked reading of large drainage basin DEM data. At the same time ,it puts an emphasis on the storage method ,the quick extraction of terrain line as well as the composition of large drainage basin DEM data. It also puts forwards the method of how to handle isolated points based on the above methods and realize the quick extraction of terrain structure line of large drainage basin DEM data.