EVI: Enhanced Vegetation Index

It was developed as an alternative vegetation index to address
some of the limitations of the NDVI.

The EVI was specifically developed to:

1.Be more sensitive to changes in areas having high biomass (a serious shortcoming of NDVI),
2.Reduce the influence of atmospheric conditions on vegetation index values, and
3.correct for canopy background signals.

Formula: EVI = 2.5 * ((NIR R) / (NIR + C1 * R – C2 * B + L))

In Landsat 47, EVI = 2.5 * ((Band 4 – Band 3) / (Band 4 + 6 * Band 3 – 7.5 * Band 1 + 1)).

In Landsat 8,
EVI = 2.5 * ((Band 5 – Band 4) / (Band 5 + 6 * Band 4 – 7.5 * Band 2 + 1)).

Range: 1 to 1

where NIR, RED, and BLUE are atmosphericallycorrected (or partially atmosphericallycorrected) surface reflectances, and
C1, C2, and L are coefficients to correct for atmospheric condition (i.e., aerosol resistance).
For the standard MODIS EVI product, L=1, C1=6, and C2=7.5.


Limitations
One of the biggest current limitations to implementing EVI is that it needs a blue band in order to be calculated.
Not only does this limit the sensors that EVI can be applied to (e.g., ASTER has no blue band), but the blue band
typically has a low signaltonoise ratio. Research is ongoing to develop a twoband EVI that can be calculated
from just red and nearinfrared bands (see Jiang et al. 2008).

For more information:
https://wiki.landscapetoolbox.org/dok...
https://www.usgs.gov/coresciencesys...


NDVI calculation:

In Landsat 47, NDVI = (Band 4 – Band 3) / (Band 4 + Band 3).

In Landsat 8, NDVI = (Band 5 – Band 4) / (Band 5 + Band 4).

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