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Numerous errors and misinterpretations concerning the group refractive index of air are present in fields of geodesy and metrology. Many historical methods (e.g. Barrell and Sears, Edl?n) are still in a frequent use even if they are considered obsolete and inaccurate from today?s perspective. The goal of this paper is to interpret and evaluate Ciddor and Hill procedures which were published in Applied Optics in 1996, 1999 and 2002. Along a simplified method, articles by Ciddor and Hill from 1996 and 1999 were reco...

The paper reveals proposed techniques and measurement results obtained by employing Leica AT401 laser tracker into processes of calibration of field length geodetic baselines. Firstly, testing of the available laser tracker in Research Institute of Geodesy, Topography and Cartography (RIGTC) is shortly introduced and the development of a user-programmed software ATControl is presented. Secondly, measurement methodologies used for calibrating Czech State Long Distances Meausuring Standard KoпїЅtice and National Geo...