aref

Thank you my dear ones... my main problem is, How to compare tow spectral profiles? because my data is aster with low spectral resolution than hyper-sensors. therefore i cannot determine their relationship visually. please can who tell me practical example of comparing an aster z-profile to a librarian z-profile.

i want to produce a general(not exact) mineral map using envi only. It means that, i do not want to use field works e.g sampling or spectroradiometer or any other ground methods. Simply, Can anyone tell me what steps for this aim in envi?