极坐标与X-Y坐标相互转换工具，拿出来与大家分享-Polar coordinates with the XY coordinates of each other conversion tools, and show to share with you

一个原理性的坐标转换工具。将地球看作是理想球体。适用于精度要求不是特别高的基于地理信息系统的应用。-A principle of coordinate conversion tools. Earth as a perfect sphere. Suitable for particularly high accuracy is not required based on geographic information system applications.