[gdal-dev] Generating Lat, long Cordinates with bearing line and angle

[Even Rouault]

Selon Phil Scadden <p.scadden at gns.cri.nz>:

>
> > I have a *lat, lon* coordinate with a known projection system I assume
> > it a initial point. I want to generate a next Position with the an
> > *angle* with (horizontal/vertical)  and *bearing length*  in lat,lon
> > coordinates and complete it with angles and bearing lengths to form a
> > polygon
>
> Try http://www.movable-type.co.uk/scripts/latlong.html#destPoint
>
>
> However, you need to be very careful with this as calculations are being
> done assuming a spherical earth. Fine is distances arent large enough
> for the ellipsoidal effects to affect accuracy. For large distances, you
> need to use Vincent' s_formula -
> http://en.wikipedia.org/wiki/Vincenty%27s_formulae which require iteration.

http://geographiclib.sourceforge.net/ has an implementation of it.

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