Patent ID: 7200945
Filing Date: 2007-04-10
Classification: G01C

Abstract:
1. A surveying instrument comprising: measurement means for performing at least either distance measurement or angle measurement; image pickup means for picking up an area located under a vertical shaft of an instrument body, the area existing as a photographic subject; display means for displaying an image picked up by the image pickup means on a screen; an indicator for specifying a location of a survey point in an image displayed on the screen; decentering-amount calculation means for calculating an amount of decentering of a survey point with respect to an instrument center of the instrument body in response to receiving said specification by which the survey point displayed on the screen in the form of the image picked up by the image pickup means is fixed as a true centering point; and correction means for connecting a measured value of the measurement means based on the instrument center on the basis of a calculation result obtained by the decentering-amount calculation means.