Keng-h?i-t?? (經緯度), m? thang kio cho t?-li ch?-piau-h? (地理座標系) ia?h s? t?-li ch?-piau h?-thong (地理坐標系統), s? iu keng-t?? kap h?i-t?? cho?-seng e chi?t e ch?-piau-h? .