OK, that's what I get for working from memory. :-)
I got the idea more or less right but it has nothing to do with the
abbreviation under discussion....
Thanks for the correction.
73, Doug.
[email protected] wrote:
Doug,
I ran into a wiki description of GPS using WGS84 a couple days ago. It
included a mention of ESEC and it was something like: Earth Static,
Earth Centric. I think I was following a link about the Z3801A.
It referred to the fact that lat-lon is referenced to a static grid on
the Earth and doesn't change as the Earth rotates on its axis or around
the sun. Earth static and Earth centric.
That reference frame is called Earth Centered Earth Fixed (ECEF). And
that is what GPS is using "internally". However it is not lat/lon/h, but
cartesian with origo in the earth center, xy in the equatorial plane and z
pointing towards the north pole.
http://en.wikipedia.org/wiki/ECEF
--
Björn
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