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

On Thu, Aug 7, 2008 at 9:03 AM, Hamish <hamish_b@yahoo.com> wrote:
...

> d.measure - Duplicated in GUI

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

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.

thanks
Markus

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