Conceptual Framework for Spatio-temporal Process Model

Geographical phenomena involve entities and changes that are located in both space and time. Therefore, it is not an unjust germane to declare each geographical phenomena as spatio – temporal phenomena. As a result of that, building a taxonomy of spatio – temporal phenomena implies an analysis of the representation of facts and occurrences within a space – time framework. While the absolute approach represents the space time framework as a set or a collection of points and time instances, the relative approach has a view of mutual relationships between real world entities for this purpose. This paper addresses to development of the conceptual modeling phase of spatio-temporal phenomena. It is necessary develop new techniques to accommodate the peculiarities of the combined spatial and temporal information that take their outset in existing techniques and minimally extend them. As a foundation of spatio-temporal domain, covering concepts such as objects, attributes, and relationships can be present according to the objective. Based on this foundation, the paper then proposes a small set of constructs aimed at improving the ability to conveniently model spatio-temporal information at the conceptual level. These constructs may be included in a wide range of existing conceptual data models as well as event models, improving their modeling capabilities without fundamentally changing the models. New modeling approach, which based on π – Calculus, to represent and manipulation these message transmissions, is proposed. The representation model consists in describing how a message evolves in the course of time and space. We co-operate syntax and semantics of π – Calculus to define, reductions and manipulations of processes. Process calculi provide a tool for the high-level description of interactions, communications, and synchronizations between a collection of independent agents or processes. The aim of the π Calculus is to be able to describe concurrent computations whose configuration may change during the computation. π – Calculus can play two distinct roles as a model of networking in the broad modern sense and as a model of computation. Passing message capability from site to site through Channel is the outstanding characteristic of π – Calculus. This model is capable to recover eight different situations from temporal, 1 The research is supported by Liaoning Province University Innovation Team Programmes (2007T072, 2008T85) and Liaoning Province University Key Laboratory Programme (2009S049) in Liaoning Province, Peoples’ Republic of China. spatial and spatio-temporal domains and their combinations. Those situations are highly co-related with the static and dynamic behaviors of spatio-temporal phenomena.