Band math and spectral indices in ENVI

[@mohamedtakieddinehamed596]

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

[@abdulbaserqasimi6530]

thanks for your comment, not at all
its optional

[@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

[@ahmethilmigulbay7841]

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

[@abdulbaserqasimi6530]

you're welcome because based on our greatest value available on this image, and we did to rescale (change the values between 0 and 1)

[@ahmethilmigulbay7841]

@@abdulbaserqasimi6530 ok. But ı am using always "float((b1 le 0)*0 + (b1 ge 10000)*1 + (b1 gt 0 and b1 lt 10000)*float(b1/10000.0))" this formula for changing the values between 0 and 1.

[@abdulbaserqasimi6530]

@@ahmethilmigulbay7841 correct