On jeudi 15 juin 2017 07:41:06 CEST Nyall Dawson wrote: > On 13 June 2017 at 00:20, C Hamilton <adenacult...@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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