Ranking is determined by total points. If the tree forks at that point, the measurement is made below this where the circumference is least.
Circumference counts one point for each inch.
This measurement can be difficult to make, but is important. An estimate of height can be made using a yardstick. First, measure 100 feet from the tree. Align the zero inch mark on the yardstick at the base of the tree and note the inch mark that aligns with the top of the tree. Every inch equals 4 feet of height.