说明：  Dotspatial是一个可用于.Net4.0地理信息系统的类库，它能让开发人员将空间数据、分析和对应的功能添加到他们的应用程序或者向社区贡献GIS扩展，
(Dotspatial is a class library that can be used in. Net4.0 Geographic Information System. It allows developers to add spatial data, analysis and corresponding functions to their applications or contribute GIS extensions to the community.)