Construction and Applications of Topological Relation Among Contour Lines

This paper proposes a novel formalization framework of topological relation of contour lines and elaborates the applications based on it. The idea is concentrated on the continuity of the spatial proximity and the direction among contour lines. Constraint Delaunay TIN on the contour lines is employed to acquire proximal relation of neighboring contour lines. The benefits of the proposed idea are demonstrated experimentally on the time-consuming and error-prone tasks of assigning elevation value to the contour lines and connection of broken contour lines resulted from vectorizing the scanned map.