M. Egenhofer, Spherical Topological Relations, Journal on Data Semantics III: 25-49, 2005. Abstract Analysis of global geographic phenomena requires non-planar models. In the past, models for topological relations have focused either on a two-dimensional or a three-dimensional space. When applied to the surface of a sphere, however, neither of the two models suffices. For the read more Spherical Topological Relations