A semiautomatic method for assigning elevation in contour maps

Author

Maia, Marco A G M ; Xavier, Átila L F

Author_Institution

Telecommun. Studies Center, Pontifical Catholic Univ., Rio de Janeiro, Brazil

Volume

8

Issue

4

fYear

1996

fDate

8/1/1996 12:00:00 AM

Firstpage

596

Lastpage

603

Abstract

Assigning contour elevations during digitalization process of topographic charts can be a very time-consuming task and liable to human errors. The method here presented for this purpose is based upon the integration of three elements: the definition of nesting tree, a formal set of rules linking neighboring contour elevations and the concept of ambiguity interval. The information provided by the chart control points and its propagation on the nesting tree for ambiguity interval update allows to automatically evaluate a considerable number of elevations, typically 60%. The remaining curves are assessed with the help of an operator where an strategy is employed to minimize human interaction. At the end of the process, the typical figure describing the number of elevations requested by the system is around 20%

Keywords

cartography; graph theory; knowledge based systems; tree data structures; ambiguity interval; chart control points; contour elevations; contour maps; nesting tree; semiautomatic method; Automatic control; Graph theory; Humans; Image processing; Information management; Joining processes; Proposals; Surfaces; Testing; Tree graphs;

fLanguage

English

Journal_Title

Knowledge and Data Engineering, IEEE Transactions on

Publisher

ieee

ISSN

1041-4347

Type

jour

DOI

10.1109/69.536252

Filename

536252