Structural Establishment and Relational Expression of the Fenhe River System

Based on the DEM-estracted data of the Fenhe River system, combined with characteristics of the Fenhe River's own structure and data structure, the data of river segments are represented by a graph data structure, and the method of determining the direction of the river segment, building the river body, and determining the mainstream and tributaries are used. Completed the construction of tree structure in the Fenhe River system. Based on structural data of the Fenhe River, the abstract data model of the spatial structure of the river network was used to express the hierarchical relationship among the rivers in the Fenhe River system and determine the location of the river in the river structure.