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 >
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