中国湖泊数据库结构特点

中国湖泊数据库是将全国湖泊面积大于10km², 按其形态特征和各种属性数据, 按一定的标准和规范, 录入计算机存储和应用, 湖泊数据具有数据量大、类型多、以湖泊代号为关键字、交叉平行式的数据分类、动态变化快和具有空间分布等特点。湖泊数据库逻辑结构严谨, 由全国湖泊分布, 湖泊图形库与属性库, 湖泊专题数据, 模型英语等部分组成。程序结构在主控程序控制下分层次执行, 由图形、属性、专题和应用模型四大模块为第一层次。在它们控制下进入第二层次, 低层可顺利地返回高层, 形成操作简单, 使用方便的程序结构。

Structure And Feature Of Lake Database Of China

The lake Database of China is a data constitution of lake information, including various feature of lakes with an area lager than 10 km². In the database, all choice data are storaged on the established fromat then inputed to micro-computer for further application. The lake data are not only characterized by a large number of data, but also by index keywords of lake's name and code, mutiple and parallel lake classifications, lake dynamic change and spatial distribution. Logical structure of lake database is well knit. It is composed of China's lake distribution, lake graph and lakc attribute, thcmatic data of some lakes and some analytic models. Computer program structure of lake database is composed of some layers, controlled by main program. First layer includes lake graph, attribute, cutrophication database of more chan twenty lakes, and application modules. Lower layer can be operated by higher layer and can return to it. The operation of the lake database is not only simple hut convenient.