Abstract
Various instruments exist in the survey equipments, but topographic survey with conventional instruments requires many times and labor. The three dimensional laser scanner appeared in recent years can get a lot of data in short time. The authors examined the applicability of laser scanner to road surface measurement, and deliberated valid range of point crowd data. Cross sections, contour figures, and mesh grid points were used for evaluation. The authors got numerical value 35m, 45m according to the surface conditions from the laser scanner position as valid range to evaluate the road surface shape with the LMS-Z420i.
