The present invention provides a measuring
system, which comprises a surveying device installed at a known point, at least one
photodetection device to be installed at a measuring point, and a main arithmetic device; wherein the surveying device projects by rotary
irradiation a
reference plane forming
laser beam including two or more fan-shaped
laser beams with at least one of the fan-shaped
laser beams tilted and a distance measuring light performs
distance measurement by receiving a reflected distance measuring light, and performs communication of the
distance measurement data between the
photodetection device and the main arithmetic device; wherein the
photodetection device calculates an
elevation angle with respect to the surveying device based on a photodetection
signal issued by receiving the
reference plane forming laser beam, calculates an elevation position based on the
elevation angle and the distance to the surveying device, and performs communication of
distance measurement data and elevation position data at least with the main arithmetic device; and wherein the main arithmetic device communicates at least with the photodetection device among the surveying device and the photodetection device, and collects and records surveying data such as distance measurement data, elevation position data, etc. for each measuring point.