From passive to active crowdsourcing using location-

based questionnairesGoogle StreetView to rebuild a cyclist’s experience

Mobile Ghent ’13

Kevin BakerKevin.baker@ugent.be

Kevin.baker@routeyou.com

Motivation and scope

Motivation and scope

Motivation and scope

• We already look at what people do ...

Motivation and scope

Study design

• Proof-of-concept: ASKme application

Google Street View

Location

Lickert scale answers

Skip or dropout

Question

Study design

• Under the hood• X,Y• Bearing• Pitch• Question• Possible Answers• Answer Type• Date And Time• Token• User Id• Given Answers

Results

• Automaticaly generated Q-locations based on road database• Question based on road attribution:

• “is there a cycling lane visible?”, “Overall suitability of the road for cycling?”, “Overal saftey of road?”, “Is this road paved or unpaved?”, ...

• All Centers of road segment longer than 500 m

• ± 250 000 Questions / Belgium and The Netherlands

Results

Set 1: unordered list of locations and questions

• 6915 answers

• march 2013 – june 2013

• 64% unique locations

Set 2: spatially gridded list of locations and questions

• 3993 answers

• july 2013 – now

• 61% unique locations

Results

• 10-Questions-set• Goal: analyze spread among answers on same location

• 10 Street View images querying the suitability for a cyclist

• Timeframe: 7 days

• 2 question sets; self-selection of type of cyclist: recreational or race

• 118 unique questionnaire sessions• 65 recreational cyclists/32 race cyclists/21 both

• Total of 139 answered question sets

• 8.4 % dropout

• ± 5 - 10 seconds per image

Results

Q X Y RTYscore

1 3.301907 50.87629 0.775

2 3.297142 50.8778 3.872

3 5.792186 50.75135 1.663

4 3.768525 50.87891 0.775

5 4.250293 50.85228 2.846

6 5.93369 50.38827 2.984

7 3.739064 51.04478 0.913

8 5.790763 50.75148 1.663

9 3.839237 50.87856 2.057

10 4.262866 51.11538 1.663

Not Suitable

Less Suitable

Moderatly Suitable

Suitable

Very Suitable

Discussion and challenges

• Feasability to cover a large geographic region

• What do you really want to know and which information is redundant

• Unique source of Volunteered Geographic information when combined with other sources

• Remodeling RTY Formula for ‘nicest cycling routing’

• Point vs Sequence of points

• People don’t like 2D, they want 3D/4D

• Limits of the Google API

Q&A

• Contacts:

• Website: www.routeyou.com

• ASKme: www.routeyou.com/en/page/view/636/ask-me-expressing-your-opinion-on-the-bikeability-of-roads.en

Kevin BakerKevin.baker@ugent.beKevin.baker@routeyou.com

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