2690 20160701171709.0 ASTROimport-847 Farah, W. 2015 Estimating Stellar Fundamental Parameters Using PCA: Application to Early Type Stars of GES Data This work addresses a procedure to estimate fundamental stellar parameters such as T_{eff}, log g, [Fe/H], and v sin i using a dimensionality reduction technique called principal component analysis (PCA), applied to a large database of synthetic spectra. This technique shows promising results for inverting stellar parameters of observed targets from Gaia Eso Survey. Gebran, M. Paletou, F. Blomme, R. SF2A-2015: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics 2015 3-6 http://esoads.eso.org/abs/2015sf2a.conf....3F published in NONREF