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Empriical processing in CRISM data analysis


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I've come across many workshop presentation papers and research papers in which the processing of CRISM images include 'Spectral Smile Removal' and the entire sequence of Empirical Processing.


1. When we download the TRR3 data, is it already taken care of? Or do we have to follow a certain algorithm to manually apply it? Can you please suggest me how to do it? It is not mentioned in any workshop papers.

2. If we have to manually perform this task, do we have to do it via IDL/MATLAB programming or is it possible to do so in a GUI software (viz CAT, ENVI)?

Thank You!

Sourabh Shubham

Department Of Geology and Geophysics

IIT Kharagpur

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Dear Sourabh,

Only the CRISM TER and MTRDR derived products have been corrected for spectral smile. See these data product descriptions:


The CRISM Analysis Tool (CAT) does not have code to do this correction. When we analyze CRISM data using CAT, other than for the two products quoted above, we pay attention to the shift in wavelengths as a function of column number. Note that in CAT, the center wavelengths used in spectral plots are those for the middle column only.

CAT can be found at the bottom of this page: http://pds-geosciences.wustl.edu/missions/mro/crism.htm

The center wavelength and bandpass file information can be found in: http://pds-geosciences.wustl.edu/mro/mro-m-crism-2-edr-v1/mrocr_0001/document/crism_dpsis.pdf. 


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