m.distance - was Re: [GRASS-dev] Re: 7.x Status Update

Hamish hamish_b at yahoo.com
Tue Sep 30 19:28:31 EDT 2008


Hamish:
> > also have a look at the swig/python/examples/m.distance python script
> > for a fully non-interactive version.

Markus:
> Would it be possible to get bearing added to
>  swig/python/examples/m.distance
> ?
> 
> The m.cogo module assumes a cartesian coordinate system which
> isn't always sufficient... since m.distance already measures along
> the geodesic, it would be cool to also the the bearing.

No, because the bearing changes as you travel along the great circle line.

You fly out of St John's Newfoundland in a NE direction but by the time
you approach Paris you are heading SE.


/me scratches head about plotting classic rhumblines on a mercator chart.

Hamish




      



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