SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY Building the Technology Pot for the Stone Soup Method of Data Collection: Facilitating Cooperation in the Face of Scarcity Elizabeth A. Sall Transportation Research Board Annual Meeting in Washington, D.C. Tuesday January 15 th , 2013
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
Building the Technology Potfor the Stone Soup Method
of Data Collection: Facilitating Cooperation in the Face of
Scarcity
Elizabeth A. Sall
Transportation Research Board Annual Meeting in Washington, D.C.
Tuesday January 15th, 2013
DATA.But travel models need…
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
2
I AM A TRAVEL MODELER.
Caveat: I am not a data collection or surveying expert
So what am I going to talk about?
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
3
Story : We needed data for something we had never seen collected before. And we didn’t have much money or time.
…so we built this app called CycleTracks
Route Choice Data Collection Choices Considered
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
4
Cost per
Record
Cost per Respond
ent
Respondent LOE
Data Precisio
n
Data Qualit
y
RP or SP
Web-based stated preference
$ $ High SP
CATI Route recall
$$$ $$$ High Low Low RP
Personal GPS
$ $$ Med High Med RP
Bicycle GPS
$ $$ Med High High RP
Smart Phone
$ $ Low Med Med RP
Publicity! Advertising! Stickers!
CycleTracks: from coder to cyclist
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
5
iTunes Store
Android
Market
Amazon EC/2 Server running Apache
CycleTracks Data: from cyclist to analyst
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
6
mySQL
JSON
PHP PHP
Bay Area Participants (if they noted their home ZIP)
CycleTracksN-366
BATSN=153
Age Mean 34 33
Gender Female 20% 36%
Cycling Frequency Daily Several Times/Week Several Times/Month Less than once a month
48%36%13%3% N/A
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
7
Data Quality: some good, some bad
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
8
Urban Canyon Effect
Downtown
Haight Ashbury
vs
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
9
GPS Signal at Beginning of Trip
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
10
Not on a Bike
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
11
Post Processing Warranted
Gaussian smoothing
Activity & mode detection
Map matching
5,178 traces497 users
3,034 bike stages
366 usersh
(Schüssler & Axhausen 2009)
~60% of submitted datauseful
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
12
Unintended Benefit: Scalability
It works anywhere you can get a satellite signal
Database and cloud server highly scalable
Web interface for data minimizes human resources
Data cleaning open-source
Cost for data: Keeping server on Promotion
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
13
Where do people use CycleTracks?
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
14
*based on optional homeZIP field, NOT TRIP LOCATION
Agencies using Cycletracks:1. San Francisco2. Monterey Bay, CA3. Austin, TX4. Seattle, WA5. Fort Collins, CO6. Twin Cities, MN7. Raleigh, NC8. Salt Lake City, UT
Where?Where it’s advertised the most.
Place Users* Trips*
San Francisco 665** 11,458
Austin 276 2,950
Fort Collins 126 1,560
Seattle 108 1,175
Minneapolis 67 1,326
Oakland 26 127
Saint Paul 23 449
San Jose 22 70
Santa Cruz 17 254
Berkeley 14 127
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
15
*based on optional homeZIP field, NOT TRIP LOCATION** compared to 153 cyclists in the 2000 HH Travel Survey
When did new users submit first trip?
• New user registrations directly correlates with publicity
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
16
11-2
009
12-2
009
1-20
10
2-20
10
3-20
10
4-20
10
5-20
10
6-20
10
7-20
10
8-20
10
9-20
10
10-2
010
11-2
010
12-2
010
1-20
11
2-20
11
3-20
11
4-20
11
5-20
11
6-20
11
7-20
11
8-20
11
9-20
11
10-2
011
11-2
011
12-2
011
1-20
12
2-20
12
3-20
12
4-20
12
5-20
12
6-20
12
7-20
12
8-20
12
9-20
12
10-2
012
11-2
012
12-2
012
020406080
100120140160180200
Cycletracks New User's First Trip Submissions
San Francisco Monterey
AustinSeattle
Twin Cities
Fort Collins
Many just try it out , but half use it for a while
SAN FRANCISCO COUNTY TRANSPORTATION AUTHORITY
17
One Day Day - Week Week - Month 1 - 3 Months 3 - 6 Months 6 - 9 Months 9 - 12 Months Over a Year0