In the geospatial data processing and GIS analysis applications, extracting the axis of the double-line river is an
important part of graphic generalization. At first, this paper introduces the principle of Delaunay triangulation and the
extraction principle of the triangulation skeleton line. On the bases of these principles, it puts forward the method which
is about extracting the double-line river axis based on the principle of Delaunay triangulation. The method is different
from other methods of extracting the axis of the double-line river which deal with polygon objects, but adopts the bank
lines as the treatment object. This method uses the simple line objects instead of the polygon objects whose data structure
is more complex. Therefore, in data processing, the procedure complexity is reduced greatly. And it enhances the
operability of the treatment process. The experiments show that the method can extract the double-line river axis
perfectly and quickly. The method is highly effective and easy to maintain the topological relationships.
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