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  ITRF97 solution

The ItrF97 adjusted positions at epoch 1997.0 and velocities were split into several tables and SINEX files. The subsets are :

Moreover, compressed ITRF97 SINEX files for the following networks are also available via anonymous ftp (itrf.ensg.ign.fr in directory pub/itrf/itrf97):

File ITRF97.TSG contains the adjusted transformation parameters at epoch 1997.0 of each individual solution as well as the corresponding rates. The transformation parameters are from each individual solution to the ItrF97 and should be used with the equation (5).The rates have to be considered as annual variations to the transformation parameters and should be used with equation (6). On the other hand, for a given transformation parameter T provided at an epoch tk, its value at an epoch t in years could be obtained by equation (7).

 \begin{displaymath}
 \left (
 \begin{array}
{c}
 X_s \  Y_s \  Z_s \  nd{ar...
 ...ft (
 \begin{array}
{c}
 X \  Y \  Z \  nd{array} 
ight )nd{displaymath} (5)

 \begin{displaymath}
 \left (
 \begin{array}
{c}
 \dot X_s \  \dot Y_s \  \dot ...
 ...ft (
 \begin{array}
{c}
 X \  Y \  Z \  nd{array} 
ight )nd{displaymath} (6)

With, X,Y,Z are the coordinates in the ITRF97, and Xs, Ys,Zs are the coordinates in the individual system.

 \begin{displaymath}
 T(t) = T (t_k) + \dot T 	imes (t - t_k)nd{displaymath} (7)
 
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