Representing moving objects in computer-based expert systems: the overtake event example

A survey of qualitative spatial representations

“…For example, (+, 0) means that the 1 st object is moving away from the 2 nd object , s position and the 2 nd object is stable with respect to the 1 st object , s position. QTC B is expressive enough to describe movements such as a carnivore hunting a prey; but for movements such as vehicles traversing a crossroads, the complex double-cross direction (Freksa, 1992) frame is needed and so the QTC Double-Cross(QTC C ) (de Weghe et al, 2005a) has been defined. QTC C includes 81 base relations and the rules for composing relations are given in (de Weghe et al, 2005b).…”

Geographical information systems

“…Depending on the level of detail and the number of spatial dimensions, different types of QT C are defined and studied in detail in , all belonging to QT C -Basic (QT C B ) or QT C -Double Cross (QT C C ). In Van de Weghe et al (2005), QT C C is presented and its usefulness is illustrated by means of an example: the overtake event. In this paper, we present the Qualitative Trajectory Calculus -Basis (QT C B ).…”

A Fuzzy Spatio-temporal-Based Approach for Activity Recognition

“…Hereafter, we focus on the automatic recognition of activities from the interpretation of trajectories. Spatio-temporal configurations between two mobile entities can be detected by analyzing their relative distances and speeds [7,8]. B. Gottfried defines a spatio-temporal model based on the analysis of the evolution of relative directions between two mobile entities [9].…”