If you search MapInfo's MapInfo-L archives site at
http://testdrive.mapinfo.com/tdc/mapinfo-l.nsf/$about?openabout
for the key phrase "SUM: MI A thought experiment with Great
Circles", you'll find some good hints about the formulae
involved. (You can search for "SUM: AND Great Circles"--note that
case matters on the AND operator--or just search for "Great
Circle" to find everything about htem we've ever talked about.)
Anyway, a very good web site listed in that message that has all
the formulae for great circles is
http://www.best.com/~williams/avform.htm. I used it to write an
MapInfo app that plots a great circle route around the world
passing through two specified points, and another to verify that
MapInfo uses great circle distance in its Distance() function.
- Bill Thoen
Andreas Mahn wrote:
> Hi List,
>
> I need a tool that can create a geodetic line between two given
> points
> in a given number of segments, ie i need that part of a great
> circle
> that is the shorter distance between two points on the earth
> broken into
> lets say 100 km bits. I have tried Richard Greenwoods Cogo.mbx,
> but I
> haven't managed to reach my goal...
>
> Any hints are appreciated
> .................................................
> Andreas Mahn
> dds GmbH
> Stumpfstr.1
> 76131 Karlsruhe
> Germany
> Tel.: +49 - (0)721 - 9651406
> Fax: +49 - (0)721 - 9651419
> http://www.dds.ptv.de/
>
> .......................
> [EMAIL PROTECTED]
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