Band math and spectral indices in ENVI

in this video, you learn how work with band math and use built and ready indices from Envi 5.3 tools.

[hanikindi]

hello. can you please explain where did you get (0.2 to 5)as the coverage area of vegetation ? is it the spectral range??
thanks alot for your time

[mohamedtakieddinehamed]

is it mandatory to rescale the satilite image before starting the classification and calculating the spectrales indexes?

[ahmethilmigulbay]

thanks for your video. why did you use 6000 value in formula.