Figure 4. Refraction ccoefficient k estimated by the logarithmic model and reciprocal zenith observations (data of 21/05/2015, local time 11.00 -14.00hrs)

From

Empirical Modelling of Refraction Error in Trigonometric Heighting Using Meteorological Parameters

D. Gaifillia, V. Pagounis, M. Tsakiri, V. Zacharis

Journal of Geosciences and Geomatics. 2016, 4(1), 8-14 doi:10.12691/jgg-4-1-2