Is there any guide available for agb estimation using sentinel 1 data?
Sentinel-1 is a C-band SAR sensor, so it is not very sensitive to biomass of most forest stands, because the signal mostly interacts with the canopy instead of the entire trees. It is more sensitive to variations in savannas - so the chance of success depends a bit on your use case.
I can recommend this great collection of materials: SAR Handbook: Comprehensive Methodologies for Forest Monitoring and Biomass Estimation
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