[Proj] Implementation of ECEF to geodetic coords (closed form solution)
Karney, Charles
ckarney at Sarnoff.com
Thu Jan 29 22:30:57 EST 2009
> From: Gerald I. Evenden [geraldi.evenden at gmail.com]
> Data: Thursday, January 29, 2009 22:21
>
> On Thursday 29 January 2009 22:14:53 Charles Karney wrote:
>
> > However, I have extended the method to ensure that it works close to
> > the center of the ellipsoid. I believe that the accuracy is close
> > to the round-off limit for all inputs.
>
> What do you mean by "close to the center of the ellipsoid"?
sqrt(x^2 + y^2 + z^2) <= a * e^2 / sqrt(1 - e^2)
(Vermeille's method breaks down in this sphere.) This includes the
singularily of the transformation which is on the circle
z = 0
sqrt(x^2 + y^2) = a * e^2
--
Charles Karney <ckarney at sarnoff.com>
Sarnoff Corporation, Princeton, NJ 08543-5300
URL: http://charles.karney.info
Tel: +1 609 734 2312
Fax: +1 609 734 2662
More information about the Proj
mailing list