TripleSat PRI
Photochemical Reflectance Index for TripleSat
Vegetation Satellite Provider: 21AT
Applications
photosynthetic efficiency monitoring
plant stress detection
water stress assessment
light use efficiency estimation
ecosystem health monitoring
carbon uptake estimation
drought stress detection
Quick Stats
Category: vegetation
Sensor: TripleSat
Provider: 21AT
Bands Used: 2
Description
The Photochemical Reflectance Index (PRI) was developed by Gamon, Penuelas, and Field (1992) to track diurnal changes in photosynthetic efficiency. PRI detects changes in xanthophyll cycle pigments that occur during plant stress, providing a measure of light use efficiency and general ecosystem health through remote sensing.
Formulas
General Formula
TripleSat Specific Formula
(Green - Green) / (Green + Green)Spectral Band Visualization
Band Wavelengths
531: 531
570: 570
Code Examples
pri_standard.py
References
Gamon, J.A., Penuelas, J., and Field, C.B. (1992) - A narrow-waveband spectral index that tracks diurnal changes in photosynthetic efficiency. Remote Sensing of Environment, 41(1), 35-44
Gamon, J.A., Serrano, L., and Surfus, J.S. (1997) - The photochemical reflectance index: an optical indicator of photosynthetic radiation-use efficiency across species, functional types, and nutrient levels. Oecologia, 112(4), 492-501