Research on TGIS Data Object Modeling
Guobin Li · Ganhanqu dili · 2006
Spatial-Temporal GIS is inevitable tendency to realize dynamic digital earth with the essential technology.The technology of static 3D GIS is already well developed,but the 4D GIS,traditional GIS plus temporal dimension is still under the stage of theory study because its essential technology involves creation and manipulation of the temporal data base,which are related to temporal data base modeling,mainly dealing with storage and research of mass data.In this paper,it is a reasonable TGIS data modeling to combine simple and feasible snap-short modeling and convenience with flexible object-oriented data modeling,while avoiding the consistent and redundant snap-short modeling and complex object-oriented data modeling.The paper adopts a special way in dealing with the property of time: first step is to create a fundamental data,then produce buffer data through snapshot data modeling,thirdly form a new data pool with time stab,thus plenty of space is saved in data storage with this process and it is easier to realize calculation of data,which is to divide store layers based on the varying objects,finally connect discrete layers to continuous with changing functions.Meanwhile,it can be once more for history events.The theoretical approach creative study the difficulties of TGIS and has been substantiated through Automatic Cellar Theory.