KOMPSAT-3A GARI
Green Atmospherically Resistant Vegetation Index for KOMPSAT-3A
Vegetation Satellite Provider: SIIS
Applications
chlorophyll content estimation
photosynthesis rate monitoring
plant stress detection
atmospherically resistant vegetation monitoring
precision agriculture
vegetation health assessment
Quick Stats
Category: vegetation
Sensor: KOMPSAT-3A
Provider: SIIS
Bands Used: 4
Description
The Green Atmospherically Resistant Vegetation Index (GARI) is tailored on the concept of ARVI but uses the green band instead of red. It is expected to be as resistant to atmospheric effects as ARVI but more sensitive to a wide range of chlorophyll-a concentrations. GARI has a wider dynamic range than NDVI and is, on average, at least five times more sensitive to chlorophyll concentration.
Formulas
General Formula
KOMPSAT-3A Specific Formula
(NIR - (Green - γ * (Blue - Red))) / (NIR + (Green - γ * (Blue - Red)))Spectral Band Visualization
Band Wavelengths
BLUE: 450-520
GREEN: 520-600
RED: 640-760
NIR: 780-1400
Code Examples
gari.py
References
Gitelson, A.A., Kaufman, Y.J., and Merzlyak, M.N. (1996) - Use of a green channel in remote sensing of global vegetation from EOS-MODIS. Remote Sensing of Environment, 58(3), 289-298