Sphericity and refraction - MDT25

28.17 Sphericity and Refraction

This is a value added to the slope, allowing the optical effects of sphericity and refraction on the observations to be corrected. The following formula is applied:

where:

Ds\' = Corrected slope

Ds = Original slope

K = Refraction coefficient. 0.42 by default

Rt = Earth's radius in meters. 6370000 by default

The refraction coefficient and the Earth's radius can be modified in the configuration.