ly7e7
Posts: 2222
Joined: Tue Jun 29, 2004 3:15 am

Great Circle Mapper

Mon Jul 19, 2004 8:53 pm

This is actually a math question , so feel free to move it to tech forum.

I think that GCM uses gnomonic projection for calculation itself and any other projection for display. Am I right?
2 things are endless: ignorance and space
 
timz
Posts: 6160
Joined: Fri Sep 17, 1999 7:43 am

RE: Great Circle Mapper

Tue Jul 20, 2004 1:59 am

"GCM uses gnomonic projection for calculation itself"?

Dunno what this means. It calculates the geodesic distance, probably using Vincenty's formulas or something similar. It uses the wrong spheroid, so it can be off by a fraction of a kilometer, but the formulas are probably correct.

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