NDVI and RVI

good evening everyone. I need an answer. if the ndvi is based on the chlorophyll concentration then the RVI (radar vegetation index) is based on what??

google it?

RADAR VEGETATION INDEX (RVI):
RVI is a ratio of cross-polarization to ~total power from all polarization channels. It generally ranges between 0 and 1, and it is a measure of scattering randomness.
### SAR Vegetation Indices - Servir Global

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