| 摘要 |
<p>A method of surveying a surface comprises projecting a spot of light preferably coherent light onto a point of the surface where it is desired to determine a coordinate. The spot of light is projected from a location remote from the point. Two measuring instruments are located at known or determinable coordinates remote from said point. Each of the instruments is aligned with the spot, and the horizontal and vertical angles of the aligned instrument noted. The desired coordinate of the point can then be computed from the noted angles.</p> |
