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Great Circle Mapper  
User currently offlineLY7E7 From Israel, joined Jun 2004, 2292 posts, RR: 18
Posted (11 years 9 months 2 weeks 4 days 1 hour ago) and read 3263 times:

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
1 replies: All unread, jump to last
User currently offlineTimz From United States of America, joined Sep 1999, 7210 posts, RR: 7
Reply 1, posted (11 years 9 months 2 weeks 3 days 20 hours ago) and read 3171 times:

"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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