The height of DBH is measured from the base of the stem, not from the ground, even on trunk sprouts. This makes it too high to reach on many elevated sprouts. For sprouts and rooted branches, this identifies the stem from which the sprout originates. For basal sprouts, this is 0, and for most saplings, this is also 0, but if a sapling is on mound or in a pit, it may have elevation. If the stem is growing in a pit, the elevation may be negative.
Clumps emerge from the same point on the root collar.
Substate on which the stem is growing.