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TOPIC: Semi-interactiveTruPulseTest
http://groups.google.com/group/entstrees/browse_thread/thread/a3a9206eec9bd880?hl=en
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== 1 of 1 ==
Date: Tues, Oct 30 2007 10:43 pm
From: dbhguru
ENTS,
The attachment shows the configuration of 17
points in 3-dimensional space. The points are, in fact, selected
spots on a bookcase that is filled with books and other objects.
The following table on the left shows tape measured distances
between pairs of selected points. The right table shows
laser-measured distances for the first 4 pairs..
| Distances
by tape |
Distances
by laser |
|
| Pts |
Dist |
Pts |
Dist |
Tripod |
| 1-2 |
2.6 |
1-2 |
2.6 |
Yes |
| 1-3 |
3.4 |
1-3 |
3.3 |
No |
| 1-4 |
2.45 |
1-4 |
2.5 |
Yes |
| 1-5 |
2.15 |
1-5 |
2.2 |
Yes |
| 1-7 |
3.25 |
1-7 |
|
|
| 1-15 |
4.8 |
1-15 |
|
|
| 2-4 |
2.25 |
2-4 |
|
|
| 2-5 |
3.4 |
2-5 |
|
|
| 2-6 |
4.15 |
2-6 |
|
|
| 2-7 |
5.1 |
2-7 |
|
|
| 4-5 |
1.3 |
4-5 |
|
|
| 4-6 |
1.65 |
4-6 |
|
|
| 4-7 |
2.53 |
4-7 |
|
|
| 8-9 |
1.1 |
8-9 |
|
|
| 8-17 |
0.75 |
8-17 |
|
|
| 10-11 |
0.92 |
10-11 |
|
|
| 10-12 |
1.2 |
10-12 |
|
|
| 13-14 |
1.5 |
13-14 |
|
|
| 13-15 |
1.45 |
13-15 |
|
|
| 16-17 |
1.1 |
16-17 |
|
|
|
|
|
|
|
| Notes: |
|
|
|
|
| 1.
Distances are in feet |
|
|
| 2.
Tripod use indicated as yes, otherwise handheld
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I propose to make this table a work in
progress. As I take additional measurements, I'll update the table
and diaplay it. I'll likely add more pairs as we go. The purpose of
my approach to this experiment is to explore the capabilities
of the TruPulse 360 in a progressive, semi-interactive way with
members of the list. The way I'm doing it is a little crude, but I
think it will work. As I move along, I cordially invite fellow
and lady Ents to make comments and suggestions. I'll implement as
many as practicable. I hope this experiment will prove fun and
enlightening. I'll leave it to Ed to think of a way to compactly
present it on the website. I think Laser Technologies is going to be
pretty happy with the results I'm getting.
As you can see, so far, the 360 is
proving to be incredibly accurate, far surpassing my expectations.
Most of the measurements will be taken with the TruPulse on a
tripod. Some will be taken by hand, where I can manipulate the
tripod to get a pair. Sometimes I may repeat a measurement, first
with tripod and then without.
Will,
The target bookcase is the one to the back and
to the left of your head where you slept while staying with Monica
and me. I can't wait to use the TruPulse to model that big tuliptree
near Gary's house.
Bob
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TOPIC: TruPulse 360 Test
http://groups.google.com/group/entstrees/browse_thread/thread/74be23060364d3fe?hl=en
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== 1 of 1 ==
Date: Tues, Nov 6 2007 1:28 am
From: dbhguru
ENTS,
What can one do at 3:00AM when one can't sleep because of the
blasted pain of the shingles? Ah, that's an easy question. One sets
up a measurement experiment with the TruPulse 360. Yes, I started by
putting small pieces of reflective tape on the double window frame
at one end of the basement room that Monica and I have set up as my
personal space. Then I go to the opposite end of the room and shoot
to different pairs of the pieces of tape using the TruPulse's
missing line routine. The following table shows distances from one
designated point to another.
PtsDist
1-22.9
1-35.8
1-47.1
1-55.1
1-76.1
1-83.6
1-92.0
2-54.1
2-82.0
3-55.1
3-67.1
5-62.9
6-83.6
7-82.8
7-95.7
8-52.1
9-46.2
I can't post the actual layout because they are graphics objects
that won't copy, but some of the above pair are on the vertical,
some on the horizontal, and some on the diagonal.
I did two sets of measurments. The results are shown below.
Measurement Cluster #1
PtsMeasActDiffAbs Diff
1-23.22.90.30.3
1-36.15.80.30.3
1-47.87.10.70.7
1-55.35.10.20.2
1-64.14.100
1-76.46.10.30.3
1-83.63.550.050.05
2-54.14.100
2-81.92-0.10.1
3-67.57.10.40.4
6-83.63.600
7-83.12.80.30.3
Avg 0.2040.221
Measurement Cluster #2
PtsMeasActDiffAbs Diff
3-54.95.1-0.20.2
5-62.92.90.00.0
5-24.04.1-0.10.1
4-65.95.80.10.1
8-52.02.1-0.10.1
6-37.27.10.10.1
8-73.02.80.20.2
4-17.47.10.30.3
1-91.92.0-0.10.1
9-46.56.20.30.3
6-37.47.10.30.3
7-95.95.70.20.2
Avg 0.0830.167
The combination of the two clusters in terms of absolute differences
follows.
Summary
0.3
0.3
0.7
0.2
0
0.3
0.05
0
0.1
0.4
0
0.3
0.2
0
0.1
0.1
0.1
0.1
0.2
0.3
0.1
0.3
0.3
0.2
0.194
So, the average of the absolute differences of measured versus
actual is 0.194 feet for the 24 trials. Sweet! So now, what am I
going to do? Well, I think I can finally sleep, so I'm going lay
down on the couch with my trusty TruPulse 360 and snuggle it.
TruPulses are people too and need lots of love.
Bob
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