MEASURING METHOD FOR SUPPORTING MEASUREMENT OF IMAGE FOR WALL SURFACE AND APPARATUS

PROBLEM TO BE SOLVED: To provide a measuring apparatus for supporting measurement of an image for a wall surface which can measure the length of a line light while ensuring high treliability, irrespective of the length of a line light set on a wall surface, in noncontact measurement of a wall surface. SOLUTION: A line laser 3 cast from a laser (line laser) oscillator 1 which generates a segment type projection light forms a line light (projection light) 4 having a length L. The projection angle FA of the line laser 3 and distances L1, L2 between the laser oscillator 1 and both ends 5A, 5B of the line light 4 are measured. The distances L1, L2 between the laser osicillator 1 and both the ends 5A, 5B of the line light 4 are measured with a laser range finder as a noncontact type range finder installed at the position of the laser oscillator 1.