[TriLUG] OT: anyone have terrain mapping softwawre?

[Greg Brown]

I am trying to determine the feasibility of a point-to-point, fairly 
long-haul, 802.11 connection.  Does anyone have software that can 
provide terrain information such as highest peak BETWEEN two GPS 
coordinates?  Ultimately I'd like to have a small graphic that would 
show the first and fall of the land between the two coordinates so that 
I can plan the required height of the antenna masts.

Since are on this subject I'll go ahead and ask a related question: is 
an IPSec connection possible over a network which already has an IPSec 
encrypted segment?  What I'm getting at here is the long-haul wireless 
connection would likely run IPSec over the air to discourage sniffing, 
etc.  However, at the far endpoint the person using this connection has 
a specific requirement to be able to connect to his office via an 
encrypted tunnel from his laptop directly to his remote firewall.  I 
would imagine such a connection is possible and I'm also fairly certain 
that large chunks of the public switched Internet is running encryption 
between different points but I personally have never tried a connection 
like this (at least not to my knowledge).

Greg