crism How the Spectral Summary Parameters are converted to 8-bit?

[Nathan Weinstein]

Hello,

 

How exactly is each summary product converted to an 8-bit RGB channel component of the browsing product? Is there a code procedure in CAT to use with IDL?

Are the values in the summary product at a normalized intensity from 0 to 1? If so then is it only left to convert the values to a range [0, 255]?

 

Thanks, 

Nathan

[Ray Arvidson]

The spectral parameter maps from CAT are single band images in floating point. They are not RGB files. To colorize them I use ENVI's Change Color Table and switch to Rainbow. Other color palettes are also available. Not sure why you would want to loose information by converting them to byte RGB files.

Ray

[Nathan Weinstein]

Hi Ray,

In the MTRDR pipeline, the BR (8-bit) derived from the SR that is 32-bit.

My question is, how it was converted/processed?

 

Thank you,

Nathan

[Ray Arvidson]

The conversion is likely included in the code used to generate the BR at JHU/APL. I am sure various languages have this utility. Why do you need to know how it was done?

Ray

[Nathan Weinstein]

I want to calculate the summary product sensitivity matrices of some new analog laboratory material spectrum and represent by a representative browse product RGB as Viviano et. al. (2014) did (attached figure), to use it to search similar RGB corresponding response of CRISM, which also leads me to this question I posted.

 

 

Thank you,

Nathan