国家基础地理信息系统1:400万数据(1:400 million data in the national fundamental geographic information system)，介绍我国地理资源的主要内容，包括国界、省界、河流、铁路等的划分和分布情况，分类很具体，数据也很完善-National fundamental geographic information system 1: 4,000,000 Data (1: 400 million data in the national fundamental geographic information system), the principal elements of geography resources, including the division and distribution of borders, provincial boundaries, rivers, railways, etc., classification very specific data is also very perfect