[postgis-users] Determine latitude/longitude of a point giveninitial latitude/longitude, bearing and distance on a spheroid.

[Arnaud Vandecasteele]

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
<broughton.colin at gmail.com> 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 <jgr at di.uminho.pt> 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
>> > postgis-users at postgis.refractions.net
>> > http://postgis.refractions.net/mailman/listinfo/postgis-users
>>
>> _______________________________________________
>> postgis-users mailing list
>> postgis-users at postgis.refractions.net
>> http://postgis.refractions.net/mailman/listinfo/postgis-users
>
>
> _______________________________________________
> postgis-users mailing list
> postgis-users at postgis.refractions.net
> 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/