25 Mar
2013
25 Mar
'13
2:23 p.m.
On Mar 25, 2013, at 8:15 AM, Joseph Armbruster josepharmbruster@gmail.com wrote:
I can not decide how to implement ground footprints with my google earth satellite tracker.
InstantTrack uses a spherical Earth model for ground footprints.
option 3 : use a digital elevation model and an ellipsoidal model to cull-out regions that are not visible due to geographic features and project an irregularly shaped polygon downwards towards the footprint
I believe that local terrain is dominant over any large-scale terrain effect you'd be able to see on a footprint map. It would be worth modeling for AOS/LOS or mutual visibility purposes.
73 -Paul kb5mu@amsat.org