Subject: Re: IGS polar motion parameterization and smoothing
From: Thomas Herring 
Date: Thu, 03 Jan 2008 10:48:21 -0500
To: "Jim.Ray" 
CC: ...

Hello All: Jim is correct that we changed the daily boundary continuity
constraints in 2007.  This change was made based on discussions with Jim
and the general sense that is it better for the combination centers to
apply constraints rather than the ACs themselves.  We mixed up one of our
control files after the initial removal of the constraints which is why
the continuity constraint is reapplied for a while.

Regards Tom Herring.
On Jan 2, 2008, at 10:07 AM, Jim.Ray wrote:

> The MIT discontinuities
> were small for most of the period but have increased in the most recent
> results with the removal of their continuity constraint at the beginning of
> 2007. (The MIT processing strategy seems to have varied in this respect
> during 2007.)

____________________________________
Thomas Herring
Room 54-820a, MIT
77 Massachusetts Avenue
Cambridge, MA 02139
Phone (617) 253-5941, Fax (617) 258-7401
tah@mit.edu
Web: http://geoweb.mit.edu/~tah