Google Map数字栅格地图算法及应用

Research on Google Map Algorithm and Application

Google地图是Google向全球提供的电子地图服务,包括丰富的地图和黄页资源,特别是局部详细的卫星地图。通过具体分析Google Map不同坐标系下的坐标转换、Web墨卡托投影方式、地图瓦片URL组织结构,系统地研究了Google地图的算法及实现,并在VS2008环境下用C#语言实现了任意缩放系数下指定地图类型URL的合成和对应图片的下载。文中列出了部分程序代码以帮助大家进行后续开发设计,更有效地将Google地图集成到应用系统中。实验证实,该方法能够快速准确地下载指定范围的地图。

Google Maps which offer web mapping are famous for their rich map and yellow page resource in the world.According to the analysis of the Google Map＇s coordinate,projection and URL＇s elements,the algorithm and implementation of Google Map is systematically studied.With the help of VS2008,finish the composing algorithm of URL under any zoom and map types,and download corresponding tiles in the C# language.The program in the paper may help better design and integrate Google Map function into application system.Making use of this method is able to download the designated maps quickly and exactly.