Abstract: There have no suitable spatio-temporal data model to manage dynamic data in forestry information field so far. This paper pointed out that the evolution of forestry geographic entity generally is a temporal and spatial process in which gradual change and abrupt change happen alternately. Furthermore, the type and frequency of evolution of spatial distribution and attributes in forestry geographic entity are not the same. The paper put forward a new spatio-temporal expression named Sequence “States” which is composed by the modes of snapshots and events. On that basis, a object-oriented forestry spatio-temporal data model developed according to the characteristic of forestry data. Different types of evolutions could be expressed by this model as well as Different types of changes. Moreover, uncertain Data is adoped in the model to Strengthen expression to the course of grandual change. This paper verified the feasibility of the model by a prototype system.

Key words: spatio-temporal data model, sequence states, forestry, events, snapshots