A bi-level object-oriented data model for GIS applications

Proceedings., Fourteenth Annual International Computer Software and Applications Conference Pub Date : 1990-10-31 DOI:10.1109/CMPSAC.1990.139357

Amelia Choi, W. Luk

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引用次数: 2

Abstract

A bi-level object-oriented data model together with a user query language called OFQL is designed which can support applications like GIS (geographic information systems). The data model is divided into two layers, the higher-level data model and the lower-level data model. The higher-level data model or the geographic object data model primarily consists of the geographic objects and a set of semantic spatial functions through which the topological relationships of the geographic objects are defined or derived. The lower-level data model or the geometric object data model has geometric objects which are the actual spatial representations of the geographic objects in the higher-level data model. It also has a set of geometric functions that retrieve, manipulate, and compute for geometric objects. The general architecture of a GIS system using this data modeling approach consists of two modules: the query processor and the function implementor. With the OFQL user-interface, the user is able to pose queries of a geographic nature without knowing the details of the spatial representation and computation of the geographic objects.<>

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面向GIS应用的双层面向对象数据模型

设计了一种双层面向对象的数据模型和一种称为OFQL的用户查询语言，可以支持GIS(地理信息系统)等应用。数据模型分为两层，即高级数据模型和低级数据模型。高级数据模型或地理对象数据模型主要由地理对象和一组语义空间函数组成，通过语义空间函数定义或派生地理对象的拓扑关系。低级数据模型或几何对象数据模型具有几何对象，这些几何对象是高级数据模型中地理对象的实际空间表示。它还有一组几何函数，用于检索、操作和计算几何对象。使用这种数据建模方法的GIS系统的总体体系结构由两个模块组成:查询处理器和功能实现者。使用OFQL用户界面，用户可以在不知道地理对象的空间表示和计算细节的情况下提出地理性质的查询。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings., Fourteenth Annual International Computer Software and Applications Conference

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