The ITRF2000 Workshop was held on 2-3 November 2000 at the Ecole Nationale des Sciences Geographiques (ENSG), a part of the Institut Geographique National (IGN), in Champs-sur-Marne, France. The meeting was organized by the Laboratoire de Recherche en Geodesie (LAREG), which hosts the ITRF section for the International Earth Rotation Service. More than 35 researchers from most of the major ITRF contributors attended.

Following opening remarks by Michel Kasser, LAREG Director, and by Claude Boucher, head of the ITRF section, the first day of the workshop was devoted to presentations describing the various solutions which have been contributed to ITRF2000. Of the solutions which have removable constraints and are suitable for the global combination, the following numbers are avaiable:

3 from VLBI, 7 from SLR, 1 from LLR, 6 from GPS global solutions, 2 from DORIS, and 1 from a multi-technique combination. In addition, another 6 GPS solutions are usable directly in the global combination for regional densifications. The remaining GPS densification solutions will be linked to the ITRF2000 in a second step.

The second half of the workshop dealt with reports based on a preliminary analysis of the ITRF2000 data sets. These reports described the characteristics and methodology of the preliminary combination, differences among the submitted solutions, differences compared to ITRF97, problem areas, uncertainties in the methods used by the analysts, an examination of the combination residuals, and questions of datum specification.

The final part of the workshop consisted of a discussion of a set of recommendations, based on the information presented earlier. Those recommendations should be available for presentation at the IERS Directing Board meeting in December 2000. They are summarized below: