Straight line distance between two points latitude longitude in meters?

[Robbie]

I ended up getting what appeared to be good results by just using basic great circle math converting to Cartesian coordinates from radians using the radius of the earth plus altitude. I'll check all of those libraries though for usefulness because I may have other uses for them in my work. I would use gdal for cadrg maps. I actually need to start learning to use some of the libraries out there.

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[david.rediger@att.net]

This is a common problem in navigating a vessel at sea. Convert your sphere to Lat and Long then calculate the Great Circle track. The Reference I use is 'the American Practical Navigator by Nathaniel Bowditch". You can obtain a copy from the Defense Mapping Agency. Request Pub 9 both volumes. Vol 1 has the definitions and Vol 2 has the math. Here is a link: https://permanent.access.gpo.gov/lps22411/Bowditch.pdf