I have some interest in the Big Tree program for NH, run out of UNH, as I discovered one of the state champions, put them on to a second, and identified a few county champions as well. I just nominated another one, an American (White) Basswood on Clinton St in Concord, across the driveway from the courthouse.
Therefore, the idea that they are changing how girths are measured is interesting. Because of multiple trunks on many trees and the difficulty sorting out whether it is more than one, the old-fashioned method of just running a tape measure around the trunk is no longer favored. The change is a good thing. I like precision and clarity.