Research on Event-driven Spatial Process Simulating Mechanism and Its Practice
Ershun Zhong · Geo-information Science · 2009
The real world GIS describes is changing continuously,while traditional GIS can only describe it statically.However,GIS has greatly extended its application fields,most of which contain dynamic spatial information that should be managed by GIS.In order to effectively define and dynamically simulate spatial variation,OOB methods have been adopted to model core elements of spatial process,which is a modification and extension of traditional spatial data model.Meanwhile,several concepts such as dynamic graphic object model,spatial-temporal event model and event engine have been imported and realized based on SuperMap GIS component platform.Additionally,visual efficiency of dynamic spatial variation has been improved by reasonable resource arrangement,high effective spatial-temporal query and dynamic cache mechanism.Spatial variation simulation can be essentially concerned as the description of spatial object at different temporal status driven by a certain event.Common spatial variation has been modeled at bottom level to achieve event driven simulating mechanism,which simplifies the development of application level.The effect of spatial variation simulation has also been improved since the structural optimization of basic model level through event driven engine,event index and dynamic map cache mechanism.