like in the picture, AB is baidu map coordinate system consisting of a line, the line segment to the vertical direction translation after 10 meters, calculate A1, A2, B1, B2 four point coordinates (using the baidu map coordinate system) 
like in the picture, AB is baidu map coordinate system consisting of a line, the line segment to the vertical direction translation after 10 meters, calculate A1, A2, B1, B2 four point coordinates (using the baidu map coordinate system)