An automatic surveying system includes 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 therein recognition data of at least one of a pattern,
numbers, and scale calibrations, provided on the graduated face of the level rod;
and an analyzing device for analyzing and recognizing the picked-up image of the
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 the pattern, numbers, and scale calibrations, read from
the memory, to obtain a measurement.
