The Integration of Multi-scale Spatiotemporal Data and the Object Evolution Model
SHE Jiang-feng, FENG Xue-zhi, LIN Guang-fa, DU Jin-kang
(Department of Urban and Resources Sciences, Nanjing University, Nanjing 210093,China)
Abstract£ºThe essential purpose of the integration of multi-scale spatiotemporal data is to enhance the richness of the information inside the spatiotemporal database. The object evolution model is proposed to satisfy this demand. This paper firstly gives a general inspection of the evolving process of the object, and then points out that the result of its evolution includes not only the feature changes but also the mechanism changes, the direct driver to its evolution is a behavior of an object, the essential causation to its evolution is the internal mechanism of the object, and the spatiotemporal event plays the role of the information carrier among the objects. Then the object evolution model is proposed based on this inspection. As the basement to integrate multi-scale spatiotemporal data, the object evolution model can retain the characteristic of the data with different temporal-scale or different spatial-scale, and reflect the temporal changes, especially the heteromorphic changes, and the causalities within the evolving process. One example to illustrate this model is also given. Finally, an organization framework of multi-scale spatiotemporal data is proposed to facilitate the data access based on the characteristic of multi-spatial-scale data.
Key words£ºobject evolution model; spatiotemporal data model; spatiotemporal scale; database