[Proj] Wikipedia ECEF entry

OvV_HN ovv at hetnet.nl
Wed Feb 4 02:45:19 EST 2009

----- Original Message ----- 
From: "Jay Hollingsworth" <jhollingsworth at houston.oilfield.slb.com>
To: <proj at lists.maptools.org>
Sent: Tuesday, February 03, 2009 9:32 PM
Subject: [Proj] Wikipedia ECEF entry

> As long as people are asking about the term ECEF, I would like to fix
> the definition of ECEF on the Wikipedia page
> http://en.wikipedia.org/wiki/ECEF
> The definition says "The z-axis is defined as being parallel to the
> earth rotational axes, pointing towards north". Isn't it actually
> coincident with the rotational axis, rather than being parallel?

Define "earth rotational axis".
Do you mean the daily wobbling actual axis, or some intermediate 'mean' 
axis, or the line between the origin (define origin) and latitude 90d in 
some coordinate system?
See also Technical Note No. 32 at iers.org

Oscar van Vlijmen

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