[PROJ] GPS to MSL

[Paul Harwood]

This is not a question but a request.

I had to work out an API to convert from GPS coordinates to Height above
MSL. Having made it work, I wrote a blog post about the solution, since I
like to document things. I have posted it here for three reasons :

 1 As a thank you to the team. The simplicity of the actual solution shows
just how good PROJ is!

2 In case you want a good laugh, and

3 more seriously, given the impressive competence on this list, I would
like to know if I have made any glaring (or even subtle) mistakes.

Thank you

https://medium.com/p/70b723767787
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