说明：  一些GIS计算公共方法 判断两个矩形是否相交 判断两个线段是否相交 判断点是否在面内 判断线与面是否相交 判断线与矩形是否相交 判断点是否在线上 计算线段的地理方位角
(GIS calculation method to determine some of the public to judge two rectangles are intersected to determine the intersection point of two line segments are in the plane to determine whether the line intersects with the surface to determine whether the line intersects with the rectangle is calculated to determine the point whether the line segment on the geographical azimuth)