Defining edges on a round earth

  • Authors:
  • Michael Kallay

  • Affiliations:
  • Microsoft Corporation, Redmond, WA

  • Venue:
  • Proceedings of the 15th annual ACM international symposium on Advances in geographic information systems
  • Year:
  • 2007

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Abstract

On planar maps lines, polygons and polygonal paths are clearly defined by their endpoints and vertices, but on a round earth the definition of the connecting edges is far from obvious. This paper presents a definition, examines its properties, and proposes it as an industry standard. Algorithms based on this definition are outlined.