Figure 7. Refraction coefficient k derived from Kestrel data vs. interpolated values from contour map

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