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

    VLBI technique : ITRF97_VLBI.SSC
    SLR technique : ITRF97_SLR.SSC
    GPS technique : ITRF97_GPS.SSC
    DORIS technique : ITRF97_DORIS.SSC
    EUREF GPS stations : ITRF97_EUR_GPS_PERM.SSC
    EUREF points (GPS and others in Europe) : ITRF97_EUROPE.SSC

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

   Compressed ItrF97 SINEX file (ItrF97.SNX.gz about 60 Mbytes; available on request)
   ITRF97 VLBI : ITRF97_VLBI.SNX.gz, about 3.7 Mbytes
   ITRF97 SLR : ITRF97_SLR.SNX.gz about 3.3 Mbytes)
   ITRF97 GPS : ITRF97_GPS.SNX.gz about 8.5 Mbytes)
   ITRF97 DORIS : ITRF97_DORIS.SNX.gz about 1 Mbytes)
   ITRF97 EUREF Perm. GPS : ITRF97_EUR_GPS_PERM.SNX.gz about 1 Mbytes)
   ITRF97 EUROPE : ITRF97_EUROPE.SNX.gz about 5.8 Mbytes)

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 t_k, its value at an epoch t in years could be obtained by equation (7).

(5)

(6)

With, X,Y,Z are the coordinates in the ITRF97, and X_s, Y_s,Z_s are the coordinates in the individual system.

(7)