“道道通”导航电子地图数据交换标准城市图系列目录1主题内容与适用范围.......................................................................................................................................152引用标准...........................................................................................................................................................153基本术语定义...................................................................................................................................................154基本规定...........................................................................................................................................................204.1地图数据模型.........................................................................................................204.2地图数据的空间基准（坐标系和投影）.............................................................204.3地图数据的空间尺度和分幅规定.........................................................................204.3.1空间尺度.........................................................................................................204.3.2分幅规定.........................................................................................................204.4地图数据的内容（要素层）要求.........................................................................234.5地图数据的元数据内容要求.................................................................................234.6地图数据的文字（中文、英文语种）字符编码标准要求.................................235命名规则与数据类型定义...............................................................................................................................245.1图层要素（对象）类型定义.................................................................................245.2属性表数据类型定义.............................................................................................245.3数据内容的约束条件定义.....................................................................................245.4基本图层和内容定义.............................................................................................256导航电子地图基础数据分层要求与规格.......................................................................................................266.1行政区划要素.........................................................................................................266.2邮政编码区域.........................................................................................................276.3水系........................................................................................................................286.4土地利用与覆盖面.................................................................................................296.5铁路与城市轨道交通线.........................................................................................306.6城市街区面............................................................................................................316.7标志性建筑物点.....................................................................................................326.8导航道路路网线.....................................................................................................336.9道路结点........................................
