Andrew Smith wrote:
> I am sure this has been asked before, but am not sure where to look. I have tried 'Google' but could not really interpret what I was finding.
Set up an account with Google Maps. There is a 'search directory' or
some such option, which will lead you to a number of gadgets including a
'Path Profiler' writen by www.heywhatsthat.com.
You can also access it, I think, by going to that website.
It works well. I have it as part of 'My Maps'.
> I am interested in determining if intervisibility exists between various sites in SW England and S Wales, and am wondering if there are simple GIS systems, either free or inexpensive, available which can be run on a home pc.
> Any suggestions would be most welcome. I am aware of the graphical technique, but am looking at distances of possibly up to 60 km, and it gets a bit unhandy over those distances, the contours are not always legible in built-up areas, even at 1:25000, and I am also not sure over what distances the curvature of the earth starts to be critical.