Hi, I had to solve a similar problem few weeks ago. You may have a look at the vicenty formula [1], I think it's what you are looking for. This two web [2-3] site are also a good strating point.
Regards Arnaud [1] http://en.wikipedia.org/wiki/Vincenty%27s_formulae [2] http://www.movable-type.co.uk/scripts/latlong.html#destPoint [3] http://williams.best.vwh.net/avform.htm#Math On Tue, Nov 9, 2010 at 7:37 AM, Colin Broughton <[email protected]> wrote: > Also, Geoscience Australia provides an online Great-Circle distance > calculator which is very easy to use: > http://www.ga.gov.au/geodesy/datums/distance.jsp#circle > > Colin > > On 9 November 2010 10:16, Jorge Gustavo Rocha <[email protected]> wrote: >> >> Luke, >> >> Maybe you can find useful information on: >> http://trac.osgeo.org/proj/wiki/GeodesicCalculations >> >> Regards, >> >> Jorge >> >> -- >> Jorge Gustavo Rocha >> Departamento de Informática >> Universidade do Minho >> 4710-057 Braga >> Tel: 253604430 (Geral), 253604479 (Gabinete) >> Fax: 253604471 >> Móvel: 910333888 >> >> >> >> Ter, 2010-11-09 às 00:22 +0930, Luke Wilmen escreveu: >> > G'day all, >> > Long time reader, first time poster. Recently I have been developing a >> > project that is requiring a point to be translated along a great >> > circle path by a given distance (metres) and initial bearing. I have >> > already implemented functions that do this with normal spherical >> > calculations based upon an average radius for the Earth. These >> > spherical calculations work fine when you are close to the equator >> > however the accuracy is outside the tolerances for our project as you >> > move further towards the poles (points drift by upwards of 10m - 20m). >> > >> > >> > After pouring over the Internet and this mailing list I have been >> > unable to find any solution for achieving these calculations on a >> > spheroid/ellipsoid and am wondering if anyone else has had any success >> > in this area or would be able to offer some advice? >> > >> > >> > Regards, >> > Luke. >> > _______________________________________________ >> > postgis-users mailing list >> > [email protected] >> > http://postgis.refractions.net/mailman/listinfo/postgis-users >> >> _______________________________________________ >> postgis-users mailing list >> [email protected] >> http://postgis.refractions.net/mailman/listinfo/postgis-users > > > _______________________________________________ > postgis-users mailing list > [email protected] > http://postgis.refractions.net/mailman/listinfo/postgis-users > > -- -------------------------------------------------------------------- Van De Casteele Arnaud Mines Paris Tech - CRC Sophia-Antipolis 0698 24 25 29 SIG - WebMapping - SOLAP - BI - GeoCollaboration Web Site http://geotribu.net/ http://www.sismaris.org/ _______________________________________________ postgis-users mailing list [email protected] http://postgis.refractions.net/mailman/listinfo/postgis-users
