对象关系数据库中的矢量数据集空间叠加方法

首先对当前空间数据模型的特点进行了评述,指出空间数据的存储方式与空间叠加方案的设计与实现密切相关,然后基于当前流行的对象关系数据模型,提出了将拓扑复合数据结构引入对象关系数据模型的空间叠加设计思想,并结合矢量数据空间叠加的流程和对象关系数据库的特点分析了实现该技术思想的关键技术问题,最后以PostgreSQL数据库管理系统为例,设计了可行的矢量数据集空间叠加方案。

Study of Vector Dataset Spatial Overlay Based on Object-Relational Data Model

Spatial overlay is an important and basic operation of spatial analysis in GIS,and also a crux in object-relational spatial database management systems.This paper firstly analyzes the characteristics of current spatial data models and points out that data storage pattern is deeply associated with the design and implementation of spatial overlay methods.Secondly based on the popular object-relational data model,the large-scale vector dataset spatial overlay is discussed in detail.In order to improve the efficiency of spatial overlaying for large spatial dataset and meanwhile keep the advantages of object-oriented spatial data models,the authors set forward the idea of introducing topology structure into the object-relational data models,and then analyzed the technical problems of implementing the method in the vector data spatial overlay flow within the object-relational database framework.Finally a feasible spatial overlay method based on PostgreSQL DBMS is presented.