Surveying instrument

Details Surveying instrument Surveying instrument

2007-04-10

2007-04-10

Fulton, Christopher W. (Department: 2859)

Geometrical instruments

Straight-line light ray type

Level

Reexamination Certificate

active

11098597

ABSTRACT:
To obtain an accurate survey value even if a centering operation is simplified without using a specific target. When a survey point S is displayed on the screen of a display20as an image picked up by a CCD camera38in a process to perform an operation for placing a surveying instrument10directly above the survey point S, a centering operation is ended, and the survey point S is specified as a true centering point. Accordingly, coordinates (Xs, Ys) of the survey point S in which the instrument center point0is defined as an origin are calculated as a decentering amount (i.e., dislocation) of the survey point S with respect to an instrument center point0.At this time, a horizontal angle θ′h determined when a target T is collimated on the basis of the instrument center is obtained by performing angle measurement, and a horizontal-angle correction amount Δθh is calculated on the basis of the coordinates (Xk, Yk) of the virtual centering point K and on the basis of the coordinates (Xs, Ys) of the survey point S. The horizontal angle θ′h is corrected by this horizontal-angle correction amount Δθh, and the horizontal angle θh based on the survey point S is obtained.

REFERENCES:
patent: 6044567 (2000-04-01), Feist
patent: 6411372 (2002-06-01), Donath et al.
patent: 6453569 (2002-09-01), Kumagai et al.
patent: 7040030 (2006-05-01), Sawaguchi
patent: 2000-028362 (2000-01-01), None
patent: 2003-232634 (2003-08-01), None

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