Thanks. I'm not an expert in tree mapping, but according to https://wiki.osm.org/tree and https://wiki.osm.org/Key:diameter, it seems it's not always clear what the unit for this tag is, but it's typically in millimeters.

Based on streetside imagery, however, the north tree looks much larger than 7.6 cm diameter. Is that correct (imagery could be old?), or am I mismatching units here. (or are you measuring, for example, circumference in centimeters??) I would appreciate clarification here.

Thanks again for the contribution.