We discussed the issue within the local community of mappers over the past few weeks.

Most trees with circumference=0 do exist, it was just a mistake from the script used for the 2014 import.  This tag has been removed.  We did some review of trees, for instance the one referred to this note is not there anymore.

The local government has released some interesting open data about trees, so we’ll probably try to update the current dataset and import missing trees.  In the meantime, we can close this note.