1 Spackle meeting notebook Rafael J. Fernandez-Moctezuma 06/19/2007.
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Transcript of 1 Spackle meeting notebook Rafael J. Fernandez-Moctezuma 06/19/2007.
1
Spackle
meeting notebook
Rafael J. Fernandez-Moctezuma
06/19/2007
2
“Take a look at the big board! They’re gettin’ ready to clobber us!”
From Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb (Columbia, 1964)
… so we’d better make sure that things displayed in big boards (used by decision makers) give the best possible information.
3
The road ahead and progress so far
• Show speed is measured, not calculated. (see attached plots)
• Prepare datasets to complete OTREC I proposal (70% complete, need to sit down and import everything into MATLAB so it can be easily used)
• “Spatial” regression mechanisms – used Netlab and wrote wrappers to automate the tests (Linear, GMM, ANN.)
4
So, calculating or measuring speed?
• At Dave’s suggestion, I went back to raw data from several sensors (at the lane level) and produced scatter plots looking for a functional relationship.
• I tried to pick sensors from diverse areas and different traffic conditions.
• I replaced NULL values with the number “-10”.
5
-100
1020
-50
0
50-100
0
100
200
Volume
OR-217 N, Allen, Lane 2, Feb. 15, 2007
Occupancy
Spe
ed
-10 0 10 20-20
0
20
40
60
80
100
120NULL = -10
Volume
Spe
ed
-10 0 10 20 30 40-20
0
20
40
60
80
100
120
Occupancy
Spe
ed
2 4 6 8 10 1240
45
50
55
60
65
70Occupancy = 10
Volume
Spe
ed
6
-100
1020
-100
0
100-100
0
100
200
Volume
OR-217 S, Hall, Lane 1, Feb. 15, 2007
Occupancy
Spe
ed
-10 -5 0 5 10 15-20
0
20
40
60
80
100
120NULL = -10
Volume
Spe
ed
-50 0 50 100-20
0
20
40
60
80
100
120
Occupancy
Spe
ed
6 8 10 12 1425
30
35
40
45
50
55
60Occupancy = 10
Volume
Spe
ed
7
-100
1020
-100
0
100-100
0
100
200
Volume
I5 S, Portland, Lane 2, Feb. 15, 2007
Occupancy
Spe
ed
-10 -5 0 5 10 15-20
0
20
40
60
80
100
120NULL = -10
Volume
Spe
ed
-50 0 50 100-20
0
20
40
60
80
100
120
Occupancy
Spe
ed
0 2 4 6 840
45
50
55
60
65
70
75Occupancy = 10
Volume
Spe
ed
8
-100
1020
-20
0
20-50
0
50
100
Volume
I5 N, Terwilliger, Lane 2, Feb. 15, 2007
Occupancy
Spe
ed
-10 -5 0 5 10 15-20
0
20
40
60
80
100NULL = -10
Volume
Spe
ed
-10 0 10 20-20
0
20
40
60
80
100
Occupancy
Spe
ed
4 6 8 10 12 140
10
20
30
40
50
60
70Occupancy = 10
Volume
Spe
ed
9
-200
2040
-100
0
100-100
0
100
200
Volume
US 26 W, Murray, Lane 2, Feb. 15, 2007
Occupancy
Spe
ed
-10 0 10 20 30-20
0
20
40
60
80
100
120NULL = -10
Volume
Spe
ed
-20 0 20 40 60 80-20
0
20
40
60
80
100
120
Occupancy
Spe
ed
0 5 10 15 2010
20
30
40
50
60
70
80Occupancy = 10
Volume
Spe
ed
10
-10
0
10
-20
0
20-50
0
50
100
Volume
US 26 E, Jackson, Lane 2, Feb. 15, 2007
Occupancy
Spe
ed
-10 -5 0 5 10-20
0
20
40
60
80
100NULL = -10
Volume
Spe
ed
-10 0 10 20-20
0
20
40
60
80
100
Occupancy
Spe
ed
3 4 5 6 7 852
54
56
58
60
62
64
66Occupancy = 10
Volume
Spe
ed
11
Measured!
• It looks like speed is indeed measured. Plus, I’ve seen several instances of volume and occupancy = 0 with speed measurements.
12
Brown bag readings
• We mentioned picking a paper to briefly skim on a weekly basis, primarily to get acquainted with related work.
• Idea: We can meet and recap for half an hour or so (11:30 seems to work) and then have lunch with paper in hand.
• We found several relevant sources, and I volunteer to bring a paper for next week:
13
Smith, BL, W.T. Scherer, J.H. Conklin.
Exploring Imputation Techniques for Missing Data in Transportation Management Systems.
In Transportation Research Record 1836: Journal of the Transportation Research Board, Washington, D.C. , 2003
14
Minor details
• I’ll create a small webpage on SPACKLE for the Datalab website.
• We can also have a wiki and a mailing list (useful since it archives automatically.)