David Coomes was involved in an international team that developed protocols for the production and validation of satellite-based woody aboveground biomass products. The report documents accepted good practices in an open and transparent manner, that is scientifically defensible. It represents the current state of knowledge for satellite biomass remote sensing and includes a summary of current knowledge and data gaps toward operational validation of products at a global scale.
Here is the official document:
CEOS_WGCV_LPV_Biomass_Protocol_2021_V1.0.pdf (nasa.gov)
Cambridge Centre for Earth Observation 