Oriented Point Relation Algebra
The Oriented Point Relation Algebra (OPRA) serves for qualitative spatial representation and reasoning. OPRA is an orientation calculus with adjustable granularity. OPRA is based on objects which are represented as oriented points. Oriented points are specified as pair of a point and a direction on the 2D-plane.
References
- Till Mossakowski, Reinhard Moratz (2012). Qualitative Reasoning about Relative Direction of Oriented Points. Artificial Intelligence, Vol. 180–181, pp. 34–45.
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