GEMI

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Calculation:

<math>GEMI = \psi * (1 - 0.25 * \psi) - \frac{(R - 0.125)}{(1 - R)}</math>
<math>\psi = A1 / (NIR + R + 0.5)</math>
<math>A1 = 2 * (NIR^2 - R^2) + 1.5 * NIR + 0.5 * R</math>


Reference:

B. Pinty1 and M. M. Verstraete, GEMI: a non-linear index to monitor global vegetation from satellites, Plant Ecology, Volume 101, Number 1 / July, 1992