No problem Nicolas, There are still so many features I discover on OJ. Sorry for my short sintetic answer due to lack of PC in this moment. Not sure if I already integrated the source code of measure plugin into OJ svn. When I worked on that plugin I tried to detailed the origin of the algorithms, I revisited Vincenty's algorithms. I will be glad if you want to reuse the code for other purpose. Best Giuseppe
Il gio 21 feb 2019, 17:53 Nicolas Ribot <nicolas.ri...@gmail.com> ha scritto: > Hi Giuseppe, > > Yes exactly what I needed ! > Thanks, I was about reinventing the wheel ;) > (so many features I don't know of in OJ...) > > Nicolas > > On Thu, 21 Feb 2019 at 17:42, Giuseppe Aruta <giuseppe.ar...@gmail.com> > wrote: > >> There is also a plugin already integrated into OJ that can measure >> distance/ area in lat/lon. (Epsg 4326). See Measure toolbox under Plugin >> menu. >> >> >> Il mer 20 feb 2019, 15:55 Paul J. Morris <m...@morris.net> ha scritto: >> >>> On Wed, 20 Feb 2019 10:20:14 +0100 >>> Nicolas Ribot <nicolas.ri...@gmail.com> wrote: >>> >>> > Hi, >>> > >>> > > >>> > > Sounds useful to me. But i am not sure its so easy given that the >>> > > length of a degree is changing, but there may be some formulas out >>> > > there (even web pages) that calculate great circle distances ... >>> > > mhm... i think somewhere i even used such, once. >>> > > >>> > > Cheers, >>> > > Stefan >>> > > >>> > > Yes, it is based on great circles computation. I used formula from >>> > > this >>> > rather complete page : >>> > https://www.movable-type.co.uk/scripts/latlong.html >>> > >>> > Nicolas >>> >>> That page is a good source. >>> >>> Here's a java implementation: >>> >>> >>> https://sourceforge.net/p/sarmanager/code/HEAD/tree/trunk/SMT/src/net/aa3sd/SMT/math/SphericalUtility.java#l486 >>> >>> with a very basic unit test: >>> >>> >>> https://sourceforge.net/p/sarmanager/code/HEAD/tree/trunk/SMT/src/net/aa3sd/SMT/test/TestSphericalUtilityMethods.java#l64 >>> >>> Derived from the c implementation in xastir >>> >>> https://github.com/Xastir/Xastir/blob/master/src/util.c#L2913 >>> >>> Key choice is what value to use for the mean radius of the Earth. >>> >>> -Paul >>> -- >>> Paul J. Morris >>> Biodiversity Informatics Manager >>> Museum of Comparative Zoölogy, Harvard University >>> m...@morris.net AA3SD PGP public key available >>> >>> >>> _______________________________________________ >>> Jump-pilot-devel mailing list >>> Jump-pilot-devel@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel >>> >> _______________________________________________ >> Jump-pilot-devel mailing list >> Jump-pilot-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel >> > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel >
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