Re: [Opengc-devel] nav display status

[Manuel B. <li...@va...>]

On Wed, May 07, 2003 at 02:38:06PM -0400, Damion Shelton wrote:
> In any case, do any of you know how this is handled in the real world? 
> There are of course other projections available, some of which I have 
> the math for and some which I don't. On the scale that navigation 
> occurs (as distinct from flight planning) it's mostly safe to assume 
> that the world is flat, but I'd like to have a reasonably correct 
> implementation.

Having done some research for my own project earlier this year,
I believe that the projection used on current Nav Displays is a Lambert
conformal conic projection. This also seems to be the most common
projection used for aviation paper maps.

I talked to a real world Airbus Pilot about that, and although he could
not tell me which projection is used, he confirmed my thoughts. (eg.
great circles are straigt lines on the ND, except some older Airbusses) 
This pointed my to believe that the above mentioned projection is what 
he stares at in his "office".


Regards,
Manuel