国家地理信息公共服务平台公共地理框架数据——————————————————————电子地图数据规范（试行稿-20100921版）国家地理信息公共服务平台总体技术组1目录前言...............................................................................................................................................31.范围...........................................................................................................................................42.引用标准...................................................................................................................................43.电子地图数据的定义................................................................................................................44.电子地图数据的数学基础.........................................................................................................45.电子地图数据集定义................................................................................................................45.1.矢量数据集.............................................................................................................................55.1.1.基础专业级.....................................................................................................................55.1.2.政务应用级.....................................................................................................................55.1.3.影像标记级.....................................................................................................................55.2.影像数据集.............................................................................................................................76.地图瓦片定义............................................................................................................................76.1.瓦片规则.................................................................................................................................86.2.瓦片数据格式.........................................................................................................................86.3.金字塔规则.