Method and apparatus for ground-based surveying in sites...

Details Method and apparatus for ground-based surveying in sites... Method and apparatus for ground-based surveying in sites...

2007-04-03

2007-04-03

Tarcza, Thomas H. (Department: 3662)

Optics: measuring and testing

Angle measuring or angular axial alignment

Relative attitude indication along 3 axes with photodetection

C356S139010, C356S139020

Reexamination Certificate

active

10847445

ABSTRACT:
The invention relates to ground-based surveying on a site (2) which comprises an unstable zone (60) and at least one control point (FCP1, FCP2, FCP6, FCP7; CP1–CP3) placed outside the unstable zone, in which method at least one surveying device (TS8, TS9; ST1–ST3) is used to acquire positional data by sighting least one control point (FCP1, FCP2, FCP6, FCP7; CP1–CP3). The approach comprises:providing at least one sighting point (UP3–UP5; A–C) within the unstable zone (60; 20),using the surveying device(s) (TS8, TS9; ST1–ST3) to acquire positional data by sighting the at least one sighting point (UP3–UP5; A–C) that is located within the unstable zone (60; 20), andcombining the positional data acquired from: i) the at least one control point (FCP1, FCP2, FCP6, FCP7; CP1–CP3) placed outside the unstable zone and ii) at least one sighting point (UP3–UP5; A–C) within the unstable zone (60; 20), to produce a positional reference for the surveying device(s).The combining step can be implemented using a bundle adjustment technique.

REFERENCES:
patent: 5196900 (1993-03-01), Pettersen
patent: 6031601 (2000-02-01), McCusker et al.
patent: 6246468 (2001-06-01), Dimsdale
patent: 2002/0085193 (2002-07-01), Ohtomo et al.

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