EGi Geodesic Photogrammetry System, User Manual

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GPS 3 User Manual | 8103002-56
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2018-07-17
Figure 2-3. GPS dome and gantry’s components, dimensions, and weights
2.1.3 Calibration Object
The GPS will be calibrated for you by EGI’s support engineers at the time of
initial installation. Calibration is typically required only once, right after
system installation. However, the system should be recalibrated (see
Appendix B, “GPS Calibration) if you:
• move the GPS to another room or building,
• knock the dome out of alignment, or
•
if a section of sensors will consistently not solve, which could
indicate a misaligned camera.
A standardized calibration object with a radius of 10.91 cm (4.3 in.),
which is approximately the size of a human head, is shipped with
every GPS. The calibration object can reliably calibrate the system due
to it being a precisely manufactured sphere with a known geometry.