This study will present a new technique for the retrieval of CO and CH4 column amounts from high spectral resolution Fourier Transform Spectrometer (FTS) data. Results will be presented from aircraft flights of the the Scanning-High-resolution Interferometer Sounder (S-HIS) and the NPOESS Atmospheric Sounder Testbed - Interferometer (NAST-I) during several field experiments. Case study results will be presented from ER-2 underflights of the Terra satellite over controlled fires during the NASA SAFARI experiment in South Africa.