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The Gimballed Limb Observer for Radiance Imaging of the Atmosphere  (GLORIA) is an imaging Fourier transform spectrometer that is  capable of operating on various high-altitude research aircraft. It  measures the atmospheric emission in the thermal infrared spectral  region in limb and nadir geometry. GLORIA consists of a classical  Michelson interferometer combined with an infrared camera. The  infrared detector has a usable area of 128 × 128 pixels,  measuring up to 16 384 interferograms simultaneously.    Imaging Fourier transform spectrometers impose a  number of  challenges with respect to instrument calibration and algorithm  development. The optical setup with extremely high  optical throughput requires the development of new methods and  algorithms for spectral and radiometric calibration. Due to the vast  amount of data there is a high demand for scientifically intelligent  optimisation of the data processing.    This paper outlines the characterisation and processing steps  required for the generation of radiometrically and spectrally  calibrated spectra. Methods for performance optimisation of the  processing algorithm are presented. The performance of the data  processing and the quality of the calibrated spectra are  demonstrated for measurements collected during the first deployments  of GLORIA on aircraft

Level 0 to 1 processing of the imaging Fourier transform spectrometer GLORIA: generation of radiometrically and spectrally calibrated spectra