Figure 6. Contour map of refraction coefficient k derived from meteorological data using the logarithmic model

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