| More
modeling |
Robert
Leverett |
| Oct
03, 2005 10:25 PDT |
ENTS:
Over the weekend I modeled the Joseph Brant
pine to 653 cubes,
remodeled the Jani tree to 472 cubes, and remodeled the Jake
Swamp tree
for the 3rd time. The composite model yields 605 cubes for Jake.
To date, 19 trees have been modeled. Several
have been modeled twice
and one has been modeled 3 times. The following table summarizes
the
results.
Name
Height CBH Volume
CBH-50'
Grandfather 145.3 13.8
1041 40.6
Ice Glen 154.3
13.0 1033
39.1
Grandmother 150.8 13.8
928 36.5
Hiawatha 141.8
12.5 883
26.8
Tecumseh 161.3
11.7 878
37.5
Thoreau 160.2
12.6 864
Joseph Brant 156.2 11.2
653 30.0
Saheda 164.3
11.4 620
30.5
Jake Swamp 167.3 10.4
605 31.5
McDowell 141.0
12.8 586
28.0
L. Hiawatha 141.9
10.2 583
20.0
Ed Perle
125.4 10.4
552 28.8
Frank Decontie 160.1 10.1
489 28.9
Clutter
152.4 10.6
481 26.3
Jani
150.0 10.8
472 27.3
Joe Norton Tree 164.2 9.7
415 23.0
The above table standardizes the limb volume
to 7% of the trunk
volume, which will do until more data is gathered.
The Tecumseh tree needs remodeling as does the Grandfather tree.
tecumseh's volume is almost certainly overstated by between 100
and 200
cubes. The method of modeling was mixed. I expect teh
Grandfather tree
The lesson learned so far is that
multiple modelings from different
distances can reveal suspect measurements. A composite volume
modeling
can be developed from the separate modelings to include the most
reliable measurements. In time I hope to home in on diameters at
heights
of 2, 4.5, 6, 15, 25, 50, 75, and 100 feet. Maybe a
regression-based
model can be developed that will explain 90% or more of the
volume
variation. If so, this would allow a user of the RD 1000 to
concentrate
on getting accurate measurements at those heights. The first 3
would be
with D-tape. That leaves 5 measurements with the RD 1000 with 3
independent measurements at each height. That's a total of 18
total
measurements.
The primary impediment to this following
a set protocal is
visibility. A lot of time can be spent roaming around finding
locations.
Bob
Robert T. Leverett
Cofounder, Eastern Native Tree Society |
|