crowdsourcing using location- based questionnaires Google - - PowerPoint PPT Presentation

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Mar 30, 2024 780 likes •1.05k views

From passive to active crowdsourcing using location- based questionnaires Google StreetView to rebuild a cyclists experience Mobile Ghent 13 Kevin Baker Kevin.baker@ugent.be Kevin.baker@routeyou.com Motivation and scope Motivation and

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From passive to active crowdsourcing using location- based questionnaires

Google StreetView to rebuild a cyclist’s experience Mobile Ghent ’13

Kevin Baker Kevin.baker@ugent.be Kevin.baker@routeyou.com

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Motivation and scope

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Motivation and scope

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Motivation and scope

We already look at what people do ...

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Motivation and scope

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Study design

Proof-of-concept: ASKme application

Google Street View Location Lickert scale answers Skip or dropout Question

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Study design

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

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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

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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

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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

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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

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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

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Q&A

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

Kevin Baker Kevin.baker@ugent.be Kevin.baker@routeyou.com

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