地球上的方向是通過(guò)方位角測(cè)定的.Direction on the sphere is measured by azimuths.每個(gè)交叉點(diǎn)上的一條邊的長(zhǎng)度和方位角是一開(kāi)始就決定的.The length and azimuth of one side at each junction point is first decided on.方位誤差必須觀測(cè)天文方位角 ( 及經(jīng)度 ) 來(lái)控制.The error in azimuth must ...