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.)