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Spectral smile correction in CRISM hyperspectral images

The Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) is affected by an artifact common to pushbroom sensors: “spectral smile”. As a consequence, both central wavelength and spectral resolution become dependent on the across-track position thus giving rise to a horizontal spatial modulation. The correction of CRISM spectral smile is addressed using a two-step correction. First, data is re-sampled to the so-called “sweet spot” wavelengths. Secondly, the non-uniform spectral response width of the detection elements is overcome by mimicking an increase of resolution thanks to a spectral sharpening. Experiments show remarkable results regarding the decrease of smile energy.