Object-oriented Geological Disaster Data Model and Spatio-temporal Process Expression

From the point of view of the geological disaster prevention and management,an integrated object-oriented conceptual model for spatial-temporal data was proposed consistent with phenomenon ological and data characteristics of geological disasters.This model is composed of three parts,including a spatial feature model,a spatial entity model and a spatial-temporal object model.Applying this model,a unified mechanism for object state storage and spatial-temporal process expression were designed to effectively describe the status of spatial-temporal objects in geological disasters at different stages of their life cycle.