Can enhanced vegetation index have values greater than 1? I am using the ENVI software to calculate enhanced vegetation index (EVI) of a hyperspectral image and my EVI value range was from 0 to 1.9. Is it wrong?
Based on documentation from ENVI software the values should be between -1 and 1, see here
The Enhanced Vegetation Index (EVI) is an algebraic equation of:
EVI = G X ((NIR - RED)/ (NIR + (C1 x RED)-(C2 x BLUE) + L))
Where NIR is the value of the near infrared band, RED is the value of the red band, BLUE is the value of the blue band, (all three bands are atmospherically-corrected), L is the canopy background adjustment. Additionally G is the gain factor, C1 and C2 are the coefficients of the aerosol resistance term. In ENVI software G = 2.5, C1 = 6, C2 = 7.5, and L = 1.