[CRISM DATA PROCESSING: CRISM Ratioed I/F Corrected Spectra]

On 12/13/2018 at 10:25 PM, Ray Arvidson said:

Yes, I tend to use continuum removed spectra rather than ratioed spectra because the former does not introduce any biases introduced by ratioing to non-gray spectra. You might first subset your data to the wavelength interval containing the candidate absorptions and shoulders in order to highlight just the absorption features of interest.

Ray Arvidson

Thank you sir. I will follow paper entitled ''Smectite deposits in Marathon Valley, Endeavour Crater, Mars, identified using CRISM hyperspectral reflectance data'' in this regard.

[CAT 7.3.1 in ENVI 5.4]

Hi

I am getting error while adding CAT in envi. Screenshot is attached. How can I fix?

Thank you

[CRISM DATA PROCESSING: CRISM Ratioed I/F Corrected Spectra]

On 7/19/2018 at 3:42 AM, Ray Arvidson said:

Oh and to remove artifacts in the spectra many scientists ratio the data to a "bland" spectrum from the same column in the data. You just need to make sure that the spectrum you ratio to does not have spectral features that would make some artifacts in the ratioed data. I personally do not do the ratios for this very reason.

Ray Arvidson

Sir I am also facing the same problem. Actually I am not getting any neutral spectra in the whole column and image, so my query is - is it necessary to do rationing?

Also continuum removed spectra is showing clear adsorptions. So can I go with the continuum removed spectra?