many "giant" trees mapped here: https://demo.f4map.com/#lat=37.7207719&lon=-122.4794320&zoom=18&camera.theta=53.357&camera.phi=4.584

examples:
1. https://www.openstreetmap.org/node/3449132830
2. https://www.openstreetmap.org/node/3449132849
3. https://www.openstreetmap.org/node/3498135159
ecc.ecc.