GIS中地理要素多尺度表达间层次连通性的研究

Research on hierarchical inter-connectivity among multi-scale representations from GIS feature

由于地理要素在不同尺度下的抽象表达往往表现出不同的空间形态、结构和细节,如何根据地理要素在不同尺度下的表现特征提取并维护多尺度表达间的层次连通关系,至今还没看到一个完整的解决方案.对此,构建了基于多尺度表达间聚集关系的层次语义匹配规则,以同一要素多尺度表达间的层次语义关系为纽带,以数据匹配方法为手段,综合利用多重表达间的语义、几何、拓扑、属性等信息,来实现同一要素在不同尺度的抽象表达之间的层次连通关系;并以多尺度道路网数据库中道路交叉口要素多尺度表达为例,详细剖析了该策略的实现过程.试验结果验证了该方案的可靠性,为GIS中要素多尺度表达的层次连通关系维护研究提供了有力的理论支撑和可行性技术策略.图2,表7,参8.

As the issues of conceptual, semantic, and representational differences arise among multi-scale representations, maintaining the hierarchical inter-connectivity among multi-scale representations in building multi-scale modeling exists as a foundational task. The existing methods ensure that the states of representations can be linked by bi-directional inter-level connectivity are still not satisfactory in implement. This paper considers that multi-representations from the same feature had the equivalent or relative semantic relation, and the inter-connectivity was performed based on hierrchical semantic relations, so it present aggregation-based semantic hierarchical matching strategies as the basis of tackling inter-connectivity. By use of the matching criterions, such as attribute, topological, geometrical knowledge, the inter-connectivity among corresponding representations was established explicitly. Based on the strategies, and taken the multi-representations from road intersection in road networks as an example, a case in point was given in detail for specially describing the implement approach of maintaining inter-connectivity among representations in multi-scale navigable database, which was certificated as the feasible approach to deal with inter-connectivity.2figs.,7tabs.,8refs.