Survey of Surveys: expanding homogenized stellar parameters catalogue in the new release of SoS-Spectro

We present preliminary results that provide a framework for building the SoS-Spectro catalog, designed to combine spectroscopic surveys into a homogeneous dataset with reduced systematic biases. At this stage, our method has been applied to APOGEE, GALAH, and LAMOST surveys, where we have homogenized the key stellar parameters — effective temperature, surface gravity, and metallicity (Teff, logg, [Fe/H]) — and re-evaluated their uncertainties using a dedicated error analysis method. This improves the reliability of the parameters and enables consistent comparison across surveys. While the methodology is intended to be extended to additional spectroscopic datasets, here we report on the current status and first results. Looking ahead, applying the same approach to radial velocities will be crucial for identifying binary stars in large spectroscopic samples.