An event processing system for processing events in an event stream is disclosed. The system can execute instructions to receive a continuous data stream related to an application, convert geometry of the continuous data stream into a relation, track a plurality of moving objects in the continuous data stream, determine a relationship between at least a first object and a second object (e.g., a first moving object and a second moving object in the plurality of moving objects) based at least on the geometry of a continuous data stream and the relation. and perform an action based at least one the determined relationship.