WorldView Legion GEMI
Global Environment Monitoring Index for WorldView Legion
Vegetation Satellite Provider: MAXAR
Applications
Global Vegetation Monitoring
Environmental Monitoring
Agriculture
Forestry
Land Cover Classification
Quick Stats
Category: vegetation
Sensor: WorldView Legion
Provider: MAXAR
Bands Used: 2
Description
Non-linear vegetation index designed for global vegetation monitoring from satellites. Less sensitive to soil background variations compared to NDVI and provides enhanced discrimination of vegetation states.
Formulas
General Formula
WorldView Legion Specific Formula
n = (2*(NIR1²-Red²) + 1.5*NIR1 + 0.5*Red)/(NIR1+Red+0.5); GEMI = (n*(1-0.25*n) - Red - 0.125)/(1-Red)Spectral Band Visualization
Band Wavelengths
Red: 630-690 nm
NIR: 770-900 nm
Code Examples
gemi.py
References
Pinty & Verstraete (1992)
Bannari et al. (1996)