A Spatial-Temporal Data Model for Moving Area Objects
一种平面移动对象的时空数据模型

A spatial-temporal data model, named OPH model, for moving area object is presented, which considers spatial distribution and temporal evolvement of the moving object. In this model, the feature geometry of moving area object described by three kinds of spatial-temporal geometries, which are observation geometry, named O; currently present geometry, named P; and history geometry, named H. The definition of OPH is given, and then by using the union, the intersection, and the difference of set theory to populate the value of O,Pand H is populated and calculated.The spatial-temporal topological relation is defined between moving area objects,then three spatial temporal operators based on OPH,Speed,Direction and Range of moving object,are given,and the examples of spatial-temporal query and trigger based on OPH are provided.