在DotSpatial开源类库的基础上开发具有较高实用性、扩展性和技术先进性的GIS软件技术框架,初步实现了地图基本操作、数据读取加载、地图投影及坐标转换等，采用.Net平台。-Development of high practicability, expansion and technology advanced software technology of GIS fr a mework based on DotSpatial open source library, preliminary