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The NASA SAR Handbook (2019) has better graphics of how different wavelengths penetrate the tree canopy. At P-Band there are reflections off leaves, branches, trunks. Signals can also hit the ground and then be reflected back off the branches.

Also note that @dlr-en.bsky.social is publishing other commissioning test imagery for @esa.int #BIOMASS 🛰️ bsky.app/profile/dlr-...

BIOMASS sees the forests and the trees – plus much more🛰️👀 The satellite's first images – processed by DLR scientists – showcase its remarkable ability use P-band radar to image forests🌳, seeing through the canopy to the ecosystems and geological features below: www.dlr.de/en/latest/ne... 🧵