Patent ID: 8151474
Filing Date: 2012-04-10
Classification: E02F,G01C,G05D

Abstract:
1. A surveying system, comprising a rotary laser irradiation device installed at a known point and used for projecting two or more fan-shaped laser beams with at least one of said fan-shaped laser beams tilted and for forming a laser reference plane, a photodetection device, which is mounted on a mobile support member, for receiving said laser beam and for calculating an elevation angle at a photodetecting position, and a monitor photodetection device installed at a known position within said laser reference plane, wherein said monitor photodetection device has a monitor photodetection sensor for sensing and detecting said laser beam, a storage unit for storing a reference value of said laser reference plane, an arithmetic control unit for calculating positional changes over time of said laser reference plane based on the result of photodetection by said monitor photodetection sensor and on said reference value, and a transmitting unit for transmitting said positional changes over time to said photodetection device and/or to said rotary laser irradiation device as compensation information.