Automatic Contour Labeling for Scanned Topographic Maps
نویسنده
چکیده
In many mapping organizations, existing topographic paper maps comprise the most complete source of elevation. data; the objective of this research is to capture the elevation data (which is in contour form) in a GIS. The topographic relief plate which shows no height information can be scanned into a GIS. The remaining task is then to label these isolines. This paper discusses a methodology for the automatic labeling of the scanned image based on the separate input of a minimum set of height information. The implementation was divided into two parts. First, an undirected contour tree was generated from analysis of a scanned image. Secondly, a set of heuristic topological rules were applied in order to orientate the tree and thus determine a minimum set of height information required to label all the contours. Problems in this partial implementation and worst case situations are discussed.
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