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 >
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