WorldView 2 GEMI
Global Environment Monitoring Index for WorldView 2
Vegetation Satellite Provider: MAXAR
Applications
Global Vegetation Monitoring
Environmental Monitoring
Agriculture
Forestry
Land Cover Classification
Quick Stats
Category: vegetation
Sensor: WorldView 2
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 2 Specific Formula
n = (2*(NIR1²-Yellow²) + 1.5*NIR1 + 0.5*Yellow)/(NIR1+Yellow+0.5); GEMI = (n*(1-0.25*n) - Yellow - 0.125)/(1-Yellow)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)