Hierarchical Topological Inference on Planar Disc Maps

  • Authors:
  • Zhi-Zhong Chen;Xin He

  • Affiliations:
  • -;-

  • Venue:
  • COCOON '00 Proceedings of the 6th Annual International Conference on Computing and Combinatorics
  • Year:
  • 2000

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Abstract

Given a set V and three relations ⋋d, ⋋m and ⋋i, we wish to ask whether it is possible to draw the elements v ∈ V each as a closed disc homeomorph Dv in the plane in such a way that (1) Dv and Dw are disjoint for every (v, w) ∈⋋d, (2) Dv and Dw have disjoint interiors but share a point of their boundaries for every (v, w) ∈⋋m, and (3) Dv includes Dw as a sub-region for every (v, w) ∈⋋i. This problem arises from the study in geographic information systems. The problem is in NP but not known to be NP-hard or polynomial-time solvable. This paper shows that a nontrivial special case of the problem can be solved in almost linear time.