Transformation parameters from ITRF2008 to past ITRFs.  

Transformation parameters from ITRF2008 to past ITRFs.
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SOLUTION         Tx       Ty       Tz        D        Rx        Ry        Rz      EPOCH
UNITS----------> mm       mm       mm       ppb       .001"     .001"     .001"
                 .        .        .         .        .         .         .
       RATES     Tx       Ty       Tz        D        Rx        Ry        Rz
UNITS----------> mm/y     mm/y     mm/y     ppb/y    .001"/y   .001"/y   .001"/y
-----------------------------------------------------------------------------------------
  ITRF2005       -2.0     -0.9     -4.7      0.94      0.00      0.00      0.00    2000.0
       rates      0.3      0.0      0.0      0.00      0.00      0.00      0.00
  ITRF2000       -1.9     -1.7    -10.5      1.34      0.00      0.00      0.00    2000.0
       rates      0.1      0.1     -1.8      0.08      0.00      0.00      0.00
  ITRF97          4.8      2.6    -33.2      2.92      0.00      0.00      0.06    2000.0
       rates      0.1     -0.5     -3.2      0.09      0.00      0.00      0.02
  ITRF96          4.8      2.6    -33.2      2.92      0.00      0.00      0.06    2000.0
       rates      0.1     -0.5     -3.2      0.09      0.00      0.00      0.02
  ITRF94          4.8      2.6    -33.2      2.92      0.00      0.00      0.06    2000.0
       rates      0.1     -0.5     -3.2      0.09      0.00      0.00      0.02
  ITRF93        -24.0      2.4    -38.6      3.41     -1.71     -1.48     -0.30    2000.0
       rates     -2.8     -0.1     -2.4      0.09     -0.11     -0.19      0.07
  ITRF92         12.8      4.6    -41.2      2.21      0.00      0.00      0.06    2000.0
       rates      0.1     -0.5     -3.2      0.09      0.00      0.00      0.02
  ITRF91         24.8     18.6    -47.2      3.61      0.00      0.00      0.06    2000.0
       rates      0.1     -0.5     -3.2      0.09      0.00      0.00      0.02
  ITRF90         22.8     14.6    -63.2      3.91      0.00      0.00      0.06    2000.0
       rates      0.1     -0.5     -3.2      0.09      0.00      0.00      0.02
  ITRF89         27.8     38.6   -101.2      7.31      0.00      0.00      0.06    2000.0
       rates      0.1     -0.5     -3.2      0.09      0.00      0.00      0.02
  ITRF88         22.8      2.6   -125.2     10.41      0.10      0.00      0.06    2000.0
       rates      0.1     -0.5     -3.2      0.09      0.00      0.00      0.02
_________________________________________________________________________________________

Note : These parameters are derived from those already published in the IERS
Technical Notes and Annual Reports. The transformation parameters should be
used with the standard model (1) given below and are valid at the indicated
epoch.


: XS :    : X :   : Tx :   :  D   -Rz   Ry : : X :
:    :    :   :   :    :   :               : :   :
: YS :  = : Y : + : Ty : + :  Rz   D   -Rx : : Y :                       (1)
:    :    :   :   :    :   :               : :   :
: ZS :    : Z :   : Tz :   : -Ry   Rx   D  : : Z :


Where X,Y,Z are the coordinates in ITRF2008 and XS,YS,ZS are the coordinates in
the other frames.

On the other hand, for a given parameter P, its value at any epoch t
is obtained by using equation (2).

                  .
P(t) = P(EPOCH) + P * (t - EPOCH)                                        (2)


where EPOCH is the epoch indicated in the above table (currently 2000.0)
    .
and P is the rate of that parameter.