Literature
- Hirt, C.; Seeber, G. Accuracy analysis of vertical deflection data observed with the Hannover Digital Zenith Camera System TZK2-D. Journal of Geodesy 82(6): 347-356. DOI: 10.1007/s00190-007-0184-7. (PDF).
- Hirt., C; Bürki, B.; Somieski, A.; Seeber, G. Modern Determination of vertical deflections using digital zenith cameras. Journal Surveying Engineering 136(1), Feb 2010, 1-12. DOI: 10.1061/_ASCE_SU.1943-5428.0000009,2010.(PDF).
See also: Geodetic astronomy, Geoid, IERS
Read more about this topic: Zenith Camera
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