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...Background more hyperspectral instruments are available from gsics member agents airs iasi cris hiras giirs differences exist among these ir instrument measurements related calibration parameters data processing different in the past years lessons have been learned each non linearity adjustment circular filter algorithms order polarization correction this group do we need to jointly develop a document define best practice for of sounders discussion preparation bring up issues understanding what discussed grating spectrometer vs interferometer most operational designed as pre launch characterization is not here and only focus on sdr space segment ground ca val team has knowledge mainly focused christ barnet other optical system han et al fourier spectrum transform interferogram flow atbd...