Xander Bakker wrote:
should perform viewshed calculations
I know viewshed. But for calculation you need one known point (observer). In my case I do not have this information.
would require a DTM covering the world ... and point locations of mountain peak and evaluate the line of sight between the points. This would probably require some scripting (or the use Model Builder).
Scripting, etc. for me it will be too complex.
Do You think it is possible to find GIS Pro (paid help), who could give me answer?
Maybe it is too complex even for Pro and it takes years of calculations?