Scott VanBommel

Mr. Singh, TB values are found in column 24 of Diviner RDR data products (column header "tb"). The channel number is located in column 18 (column header "c"). You can get TB values strictly from channel 9 by selecting only column 24 data where column 18 is equal to 9. You then can apply your formula to these values. Alternatively, Diviner GCP products have "Bolometric average calibrated brightness temperature (K)" noted in column 11, for a given longitude and latitude noted in columns 1 and 2 respectively. If you can explain what you mean by "Zonal mean temperature" I'd be happy to help you with that as well.

Hi Chandan, You are correct, the "Spectrum" name denotes the rover and sol. A0001 is MER-A (Spirit) on sol 1, B9999 is MER-B (Opportunity) on sol 9999. You should be able to parse the sol from the Spectrum column in the APXS data table and use that as a pivot to link with the traverse data.

Hi Chandan, Thanks for your question! I think you've pointed out the main issue. The difference in the scale of GRS and CRISM data products is quite significant. For that reason, you'd be comparing large regional areas (GRS) with many orders of magnitude smaller areas (CRISM). If the region was homogeneous, then no problem. However, heterogeneities exist on much smaller scales than GRS. A direct comparison with CRISM is not advisable for this exact reason. -Scott