Hi all,
I'm looking to adjust the Refractivity Coefficient in the earth curvature correction to assess visibility for different wavelengths, however I don't understand how this input to the Viewshed tool relates to the physical parameter of refractive index.
For visible wavelengths in air, the refractive index is close to 1 (https://en.wikipedia.org/wiki/List_of_refractive_indices), whereas the default setting of Refractivity Coefficient in the Viewshed tool is 0.13.
Does anyone know the relationship between refractive index and Refractivity Coefficient?
How Line Of Sight works—ArcGIS Pro | Documentation
the reference in the link may be worth consulting if your applications are different than those used by default for the tool