[Qgis-user] [QGIS-Developer] Geodesic Measure Tool With Bearing Information

[Even Rouault]

On jeudi 15 juin 2017 07:41:06 CEST Nyall Dawson wrote:
> On 13 June 2017 at 00:20, C Hamilton <adenaculture at gmail.com> wrote:
> >> > Right now it could use the Vincinty algorithms in QGIS to calculate the
> >> > distances, but eventually I would like to see the geographiclib
> >> > algorithms
> >> > used.
> >> 
> >> I'd start with the bearing changes (since they are self contained, and
> >> the methods for calculating bearing are already present in the QGIS
> >> api). Then using geographiclib could be discussed as a separate set of
> >> changes, to be decided on its own merit. If you mix these two changes
> >> it's likely to get bogged down as one or other part of the changes are
> >> debated.
> > 
> > Ok.
> 
> This looks relevant:
> 
> https://github.com/sourcepole/kadas-albireo/commit/df64318e5198f40f0e96d27fc
> f9e179fbbf682fd
> 
> There's a lot of unrelated changes in there, but it also shows the
> basics for using geographiclib within the QGIS c++ code.
> 

Note that at least since proj 4.9.0, Charles Karney has ported its geodesic code from 
geographiclib in C (since proj.4 is C only) and the header is normally installed with proj-dev 
package (I've just checked on my Ubuntu 16.04 with proj 4.9.2. I see it is also available in 
OSGeo4W):

https://github.com/OSGeo/proj.4/blob/4.9.0/src/geodesic.h

Even
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