Patent ID: 6907133

Claim:
An automatic surveying system comprising: a telescopic optical system; an image pickup device for picking up an image of a graduated face of a level rod, to which the telescopic optical system is to be collimated, and converting the image into image data; a memory which stores recognition data of at least one of a pattern, numbers, and scale calibrations, provided on the graduated face of the level rod, said stored recognition data corresponding to a plurality of different kinds of level rods; a selection device for selecting one of the plurality of different kinds of level rods; and an analyzer for analyzing and recognizing the picked-up image of said at least one of the pattern, numbers, and scale calibrations of the level rod, based on the image data of the level rod picked up by the image pickup device and the recognition data of said pattern, numbers, and scale calibrations corresponding to the selected kind of level rod, read from the memory, to obtain a measurement.