地理信息数据库实现

Building Geomorphologic Information System

地理信息库是Ｘ－２０００高速三维地形显示系统的重要组成部分，主要对地图和地理实体进行存储和管理。地图、地理实体和其他图形对象一样，其属性值具有不定长性、层次性和多媒体性，难以用简单的数据类型表示等特征。本文在解决如何用传统数据模型来描述和存储复杂的地图和地理实体的基础上，用商用数据库管理系统（ＯＲＡＣＬＥ５．１Ｂ版本），采用全关系型结构，设计和实现了地理信息数据库。

Geomorphologic information database, which is mainly used to memorize and manage the map and geomorphic objects, is an important section of X-2000 high-speed 3D terrain display system. Like other graphic objects ,map and geomorphic objects' attributive value has the property of unfixed length, hierarchy and multimedia. It is difficult to describe it with simple data type.On the basis of how to use traditional data model to describe and memorize complicate map and geomorphic objects , this paper makes use of commercial database manage system(ORACLE 5. 1B) ,and full related structure to design and build the Geomorphologic Information Database.