Accuracy and Applications
If the geodetic coordinates of the zenith camera is known or measured, e.g., with a GPS-receiver, vertical deflections are obtained as result of the zenith camera measurement. Zenith cameras deliver astronomical coordinates and vertical deflections accurate to about 0.1 seconds of arc. Zenith cameras with CCD image sensors are efficient to collect vertical deflections at about 10 field stations per night. Zenith cameras have been used for accurate local surveys of Earth's gravity field (geoid, quasigeoid).
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