The individual solutions selected for the ITRF97 analysis are 4 VLBI, 5 SLR, 6 GPS, 3 DORIS and one multi-technique (SLR + DORIS) solution. These solutions are summarized in Table 1.

On the other hand, the local ties of collocation sites, used in the ITRF97 adjustment were first converted into a complete set of positions for each site expressed in SINEX format.

Table 1 : Selected Solutions for the ITRF97 analysis