Published on February 17, 2014
Urban Computing: Sensing City Potential through Social Data Yutaka Arakawa, ph.d Associate Professor Nara Institute of Science and Technology, JAPAN
A human works as a sensor • Traditional Sensors • Mote, Micaz, Zigbee, Arduino, etc. • Numerical info. Ex:Temperature, Humidity • Human Sensors • Twitter, Facebook, Foursquare, etc. (User generated contents) • Textual info. Ex: Delicious, Hot, Noisy Crowdsourcing Delicious! I’m in Singapore So Exciting! A Train is delayed.
Learn from 3.11 • 位置登録実績MAP （コロプラ） Before 3.11 Safety status of 3G networks Access log of Location-based social “GAME” After 3.11 3
Research Target What kind of information can be found from social data? City Potential • • • • • Popular Sightseeing Spots Popular Photo Spots Popular Events Movement of people etc...
Our research results 1. Sightseeing spots retrieving 1. Photo spots recommendation
Our research results 1. Sightseeing spots retrieving • Where is the most attractive spot in the city? • Not only the location but also its name. • Social City Maps 1. Photo spots recommendation
Motivation: City Map Only STAR no text, no figure Latest map Old traditional map 3D figure, and title
Finding spots from social data The number of photo || Famousness Clustering Flickr provides good data. Twitter is noisy. Crandall, D., Backstrom, L., Huttenlocher, D. and Kleinberg, J.: “Mapping the world’s photos”, ACM WWW2009, pp. 761– 770.
Our research issues What attracts the people? Analyze other social data, such as Foursquare, Facebook, etc. Is is really good spots? Develop an android application as an evaluation platform
Our developed application A platform for publishing and evaluating UGM (User Generated Maps)
Other research issues Clustering Naming Output by sklearn Source by place API as a kml file Facebook Facebook Mean Shift Clustering (Flat Kernel) Flickr Foursquare Yahoo Research topic 2 Twitter Foursquare Research topic 7 how to estimate proper BW? how to change BW dynamically? Wikilocation how to evaluate ? Google Research topic 1 how to eliminate a noise? Research topic 6 Research topic 3 how to select only famous spots? how to quantify famousness? Twitter how to select a representative image or additional information for the cluster ? Research topic 4 Research topic 5 How to take user’s preference into consideration? how to decide a proper name of each cluster?
Our research results 1. Sightseeing spots retrieving 1. Photo spots recommendation • City potential is represented by photos. • Place and setting recommendation for amateur user.
Photo spot recommendation Camera setting? (ISO, exposure,etc) From where? Which season? What time? How about a weather?
My experience @Singapore From where? Which season? What time? How about a weather? Camera setting? (ISO, exposure,etc)
Architecture of our system
Screen shots Various Conditions can be set. Photos are selected from Flickr.
Screen shots Camera setting info. Navigation
Summary Social Network Services Open data (Government) Find city potential (Our researches) Ubiquitous city
Thank you! This work is partially supported by SCOPE(Strategic Information and Communications R&D Promotion Program).
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