Hello,
I apologise if this is an extremely obvious question, but I'm very new to using CRISM data.
I am using CAT v6.6 to process the frt00004af7_07_if164l_trr3.img of Hale crater while following the CRISM walkthrough tutorial of Nili Fossae from crism.jhuapl.edu/CRISM.../CRISM_Workshop_090322_Nili_Fossae_Walkthrough_FPS.pdf.
Is it normal after completing atmospheric correction using the optimum wavelength volcano scan method, to still have an obvious CO2 absorption feature from 1.9-2.1 µm? If I then take a spectral ratio s1/s2, no recognisable spectral signature is apparent - as in the tutorial.
Regards,
EJA.