TOPIC: Another tree mini-study
== 1 of 3 ==
Date: Tues, Jun 17 2008 12:31 pm
The Excel attachment contains another tree profile that I was doing
in Look Park earlier today. Threat of rain caused me to cut the
mini-study short, but the data I did collect continues to tell the
story. No surprises. But in the case of the Look Park sycamore, an
additional lesson gets reinforced. There is no reason for a person
with tape and clinometer to choose the actual high point of the
sycamore as the point to measure, i.e. identifying it as the true
top, because from any direction, the actual highest point never
looks to be the highest. And due to the actual high point's
positioning in the interior of the crown, it will be measured to a
height slightly less than its actual height.
There is yet another lesson. In circling the tree, there is no place
where you can identify the high point at a lateral direction to the
line from measurer to trunk. Big Don's method of using distance from
meaurer to trunk as a substitute for the hypotenuse of the
horizontal right triangle in which the hypotenuse is the right base
line for the high point. That nifty shortcut can be implemented with
the right equipment as illustrated in the first line of the
spreadsheet. I made the shortcut work, remembering that the high
point did not in fact appear to be the high point from my vantage
point. Without my TruPulse 360, I could not have lined the point up
The mini-study reinforces the big lesson: broad-crowned hardwoods do
not lend themselves to the tangent method. That technique can work
for properly behaved trees, but carries an inordinate level of risk
for tall, spreading trees and points to the need for a special ENTS
focus on places like Congaree, awash in broad-crowned hardwoods.
== 2 of 3 ==
Date: Tues, Jun 17 2008 1:53 pm
From: "Edward Frank"
Keep up the experiments. They are interesting. This is your third
tree mini-study in the past couple weeks. Maybe next time you should
try a study of mini-trees!
== 3 of 3 ==
Date: Tues, Jun 17 2008 2:11 pm
Actually, examining a head high shrub or bush up close allows one to
better visualize the complexity of the crown of a large tree and
appreciate what it takes to isolate the highest twig and accurately
measure it. Without an up close and personal examination, we tend to
create idealized stick figures.
If all goes well, Monica and I are heading to Idaho on Saturday. My
reporting in will be sporadic, but of the forests I see going and
coming, and if lucky some western white pines. That's my hope.