2009 acm lbsn_presentation


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  • 2008/1/1 – 2008/12/31 3,965 photos containing 36,498 tags in total 7,564 unique tags.
  • 2009 acm lbsn_presentation

    1. 1. Conceptualization of Place via Spatial Clustering and Co-occurrence Analysis a Institute of Information Science, Academia Sinica b International Institute for Geo–Information Science and Earth Observation (ITC) Dong–Po Deng ab ; Tyng–Ruey Chuang a ; Rob Lemmens b 2009 International Workshop on Location Based Social Networks (LBSN’09) Nov. 3, 2009, Seattle, WA, USA
    2. 2. Introduction <ul><li>In an insightful exposition of the cultural meaning of place, Yi-Fu Tuan (1975) notes the places may be studied either as a location in a hierarchy of units or as a unique artifact. As an artifact, he regards place as ‘a center of meaning constructed by experience.’ A place may be significant to any individual or group, and may exist at any scale (Tuan 1975: 152). As Tuan notes, the number of such places is hypothetically infinite. However, not all possible places are in fact named and defined as places. Locations become places only when events occur that cause them to become imbued with meaning. Historical gazetteers therefore need to record the occurrences that have made places into centres of meaning </li></ul>
    3. 4. Photos and Tags in Flickr Tags Geo-Tag Time-Tag
    4. 5. Where is the beef? <ul><li>2008 amsterdam canal europe holland netherlands noordholland north travel </li></ul>Is geospatial data created in a social network a valuable production in and for a geospatial society in general? How to extract the geospatial information from user-generated contents in a social network?
    5. 6. Selected photos from Flickr
    6. 7. Spatial Clustering method (DBSCAN)
    7. 8. Co-occurrence analysis Photo-tag matrix tag-tag correlation matrix
    8. 9. The correlation between the tag “amsterdam&quot; and the tags of several landmarks associated to Amsterdam Distance Correlation coefficient
    9. 10. Conceptualizing places in different spatial scales
    10. 11. Conceptualizing places in different spatial scales
    11. 12. Conceptualizing places in different spatial scales
    12. 13. Conceptualizing places in different spatial scales
    13. 14. Conclusions and future works <ul><li>Without the use of suitable spatial clustering, detailed information about a place is veiled by high frequency tags </li></ul><ul><li>A conceptualization of place is unveiled by tag co-occurrences at a suitable spatial scale </li></ul><ul><li>Location-based applications can be developed to suggest tags to users as they take photos </li></ul><ul><li>In the future we will ground the semantics between pairs of tags via the use of gazetteers or dictionaries </li></ul>
    14. 15. Thank you for your attention! [email_address]