森林资源动态变化的时空拓扑分析

Spatio-temporal Topological Analysis of Dynamic Changes of Forest Resources

森林资源是一种动态变化的可再生资源,在地理信息系统中表现为空间位置和属性特征随时间发生变化。分析了森林资源动态变化的原因,描述动态变化过程中时间信息以及空间形态和属性特征的变化特点,在此基础上分析森林资源动态变化的时空拓扑关系,结合森林资源小班不会出现交叉、重叠的现象,空间拓扑变化只包括相离和相会的变化。时态拓扑变化先考虑同一时刻小班变化的时态拓扑变化,再结合发生变化的时间先后关系,综合考虑不同时刻小班变化的时态拓扑变化,这样可以简化时态拓扑变化的分析。

Forest resources are dynamic renewable, their spatial locations and the performance characteristics and attributes change in geographic information systems. The causes of the dynamic changes of forest resources were discussed. Spatial and attribute information were described to establish spatio-temporal topological relationship of dynamic changes of forest resources. Subcompartments in forest resources would not be crossed, overlapped, spatial topology changes only included joint and disjoint. Changes of subcompartment in the same time were considered in the temporal topology changes, then combing with the rela- tionship between chronological changes, topology changes of subcompartment at different times were considered, to simplify the analysis of temporal topology.