GDF4.0标准是电子地图的空间数据标准，是国标《导航地理数据模型及交换格式》的原型-GDF4.0 standard electronic maps of spatial data standards, GB is the "navigation geographic data model and exchange format" prototype

GDF4.0格式标准，欧洲空间导航数据格式标准规范-GDF4.0 format standards, the European space-based navigation data format standards