| 摘要 |
PROBLEM TO BE SOLVED: To easily and highly accurately calculate a measurement error of a horizontal position in laser measurement without depending on the environment of a measurement position.SOLUTION: A laser measurement system comprises a laser measurement device, a reflection target body, and a calculation device. The laser measurement device irradiates the ground with a laser beam to enable measurement of a position of a footprint of the laser beam by reflection light from the ground. The reflection target body is placed at a position where the laser beam on the ground can be received, has such a shape that a part of a sphere is cut out in a plane, and is capable of reflecting the laser beam at a higher reflectance ratio than the ground. The calculation device, on the basis of each three-dimensional position coordinate calculated by at least four beams of reflection light which are emitted from the laser measurement device and assumed to be reflected by the reflection target body, calculates a horizontal position coordinate at the center of the sphere and thereby calculates an error from difference between the calculated horizontal position coordinate and a horizontal position coordinate measured by other measurement with respect to an apex of the reflection target body.SELECTED DRAWING: Figure 6 |
