基于Oracle Spatial的地籍地块空间拓扑关系判断

将地籍地块间空间拓扑关系的判断分为2个层次来处理:2个简单地块间空间拓扑关系的判断;1个简单地块与1个复合地块间空间拓扑关系的判断.2个简单地块间空间拓扑关系的判断可直接利用Oracle Spatial提供的空间关系查询操作算子来实现;复合地块和简单地块间空间拓扑关系的判断,按照双四元交模型(D4I)的思想,将其转化为2组简单地块,然后利用Oracle Spatial的空间关系查询操作算子来处理.研究结果表明:在Oracle Spatial平台上实现了地籍地块间31种空间拓扑关系(包括2个简单地块间的8种空间拓扑关系和1个简单地块与1个复合地块间的23种空间拓扑关系)的判断,并且这种判断方法同样适用于其他类型二维面域或复杂目标间空间拓扑关系的判断.

A Computation Method of Parcels′ Topological Relations Based on Oracle Spatial

A computation method of the topological relation between parcels was developed based on Oracle Spatial. In this paper, 31 kinds of topological relations between parcels are firstly distinguished according to D4I model, which includes 8 kinds of relations between two simple parcels, and 23 kinds of relations between a parcel with one hole and a simple parcel. Then the computation method of the topological relations was presented, the relations between simple parcels was ascertained directly by the query operators that Oracle Spatial supported. The results show that the relations between a parcel with one hole and a simple parcel can not be ascertained directly, and the parcel with one hole is divided into two simple parcels according to D4I model. Such kinds of relations can be ascertained by the relations of 2 pairs of simple parcels, which can be ascertained directly. In addition, a topological relations computation method between parcels is developed in this paper, which can determine 31 kinds of topological relations between two parcels. This method can be used to the topological relations computation of other regions and other composite entities in 2-dimension euclidean space.