| 1. A measuring system, comprising 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 said surveying device comprises a laser beam projecting
unit for projecting by rotary irradiation a reference plane forming laser beam including two or more fan-shaped laser beams
with at least one of said fan-shaped laser beams tilted and a distance measuring light, a distance measuring unit for performing
distance measurement by receiving a reflected distance measuring light from said photodetection device, and a radio communication
unit for performing communication of the distance measurement data between said photodetection device and said main arithmetic
device; wherein said photodetection device comprises a reflection unit for reflecting the distance measuring light toward
said surveying device, a photodetection unit for receiving the reference plane forming laser beam, a photodetection side control
arithmetic unit for calculating an elevation angle with respect to said surveying device based on a photodetection signal
issued when the reference plane forming laser beam is received by said photodetection unit and for calculating an elevation
position based on the elevation angle and the distance to said surveying device, a photodetection side radio communication
unit for performing communication of distance measurement data and elevation position data at least with said main arithmetic
device among said main arithmetic device and other photodetection devices; and wherein said main arithmetic device comprises
a main radio communication unit being able to communicate at least with said photodetection device among said surveying device
and said photodetection device, and a main storage unit for collecting and recording surveying data for each measurement point.
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