Idle musing - I wonder if you could see Sidbury if you stood on the top of the lintel ring at Stonehenge, or on the even higher great trilithon (of which only one stone still stands). It'd put you at least 30 feet higher off the ground.
(and now, some 4 years later....)
I've happened across http://www.heywhatsthat.com/ and it's a very handy thing for determining intervisibility based on terrain modelling.
I just had to have a go at putting my eyes 30' up in the air by standing on top of the Grand Trilithon at Stonehenge to see if I'd be able to see Sidbury Hill poking up above Larkhill.
I've attached some screengrabs of the output which speak nicely for themselves :-)
The red shading is the terrain that's visible if you were to stand on top of the Grand Trilithon at Stonehenge. Purple cross is Stonehenge, black one is Sidbury Hill
Horizon and ground profile looking on a bearing of 49° towards Sidbury Hill as seen from atop the Grand Trilithon. In the ground trace, the large bump on the right hand side is Sidbury Hill - notice how the sightline just manages to clear the ridge at Larkhill
Check back up this thread to find my earlier ground traces done the old fashioned way.
--
simon
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