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Web and Data Science Center 2012-10-03 Event-based analysis of peoples activities and behavior using Flickr and Panoramio geotagged photo collections.

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Presentation on theme: "Web and Data Science Center 2012-10-03 Event-based analysis of peoples activities and behavior using Flickr and Panoramio geotagged photo collections."— Presentation transcript:

1 Web and Data Science Center Event-based analysis of peoples activities and behavior using Flickr and Panoramio geotagged photo collections

2 Slava Kisilevich, Milos Krstajic, Daniel Keim, Natalia Andrienko, Gennady Andrienko University of Konstanz, Fraunhofer Institute IAIS,

3 Abstract Photo-sharing websites such as Flickr and Panoramio contain millions of geotagged images contributed by people from all over the world. Characteristics of these data pose new challenges in the domain of spatio-temporal analysis. In this paper, we define several different tasks related to analysis of attractive places, points of interest and comparison of behavioral patterns of different user communities on geotagged photo data. We perform analysis and comparison of temporal events, rankings of sightseeing places in a city, and study mobility of people using geotagged photos. We take a systematic approach to accomplish these tasks by applying scalable computational techniques, using statistical and data mining algorithms, combined with interactive geo-visualization. We provide exploratory visual analysis environment, which allows the analyst to detect spatial and temporal patterns and extract additional knowledge from large geotagged photo collections. We demonstrate our approach by applying the methodsto several regions in the world KeywordsGeo visual analytics, geotagged images, spatiotemporal analysis, movement data, clustering

4 Intro Photo-sharing sites Flickr and Panoramio have billions of photos, publicly available, and annotated with metadata – Image size – Tags – Titles – Time Stamps – Geo Tags

5 Panoramio Example

6 Whats Interesting to Us? Users trajectory of sequence of photos (one user, photos close in time and space) Which places are interesting to users (clusters of photos by geotags) Events that are interesting to users (specific time interval and location range) Result: We care a lot about timestamps as well as geotags.

7 Related Work 2008 – Flickr was used to identify regions of high tourist concentrations in Rome Photo is Figure 1 from the paper

8 Attractiveness by Density Maps The common and fast way to analysis of attractiveness or activity is to split a geographical region into cells, count the hits in each cell, color code the region by the count

9 Related Work 2009 – Mean-shift, a non-parametric clustering algorithm used to find the most attractive places on Earth via Flickr 30 most photographed places in Boston

10 Convex Hulls Density based clustering algorithms are a good way to find attractive areas. Density connectivity between points using distance and density thresholds finds clusters of photos

11 Analytical Framework Formal Model O S T A 1 A 2 A n where O is the set of objects, S is the set of places, T is the set of moments, and A 1, A 2,, A n are additional attributes of the events A visual representation of the data is needed to get real value from this model Google Earth is a good tool. Use brushing, linking, focusing to gain inferences

12 Data Collection Flickr API – REST (REpresentational State Transfer) – – Many parameters can be used to narrow the search – If you dont narrow the search, Flickr will do it without telling you – You can only get 4000 results from any query

13 Flickr To get all Flickr photo metadata, you can ask how many photos in a region of the earth, subdivide it and/or time-split it until you get queries that result in less than 4000 photos Alternate approach: Flickr has groups: given a user id, you can find others with similar interests and see what they uploaded.

14 Flickr Search

15 Flickr Search by Bounding Box URL: ces/rest/? search&api_key=36aa30d4f02fc667 22ab71cbfb40e2a8&bbox=-180%2C- 90%2C180%2C90&format=rest Or: &format=json&nojsoncallback=1 JSON (JavaScript Object Notation)

16 Time-delimited Search of Flickr URL: arch&api_key=36aa30d4f02fc66722ab71cbfb40e2a8&max_take n_date= %3A00%3A00&bbox=-180%2C-90%2C18- %2C90&format=rest

17 Time-delimited Search of Flickr URL: arch&api_key=f3794ef16c22e0e96f587fc2a190170e&min_taken _date= %3A00%3A00&bbox=-180%2C-90%2C18- %2C90&format=rest

18 Only those photos from last 12 hours

19 Panoramio

20 Panoramio REST User IDs run from 1 to …

21 Panoramio by User ID 10&minx=-180&miny=-90&maxx=180&maxy=90&size=mini_square 10&minx=-180&miny=-90&maxx=180&maxy=90&size=mini_square {"count":2,"has_more":false,"map_location":{"lat": ,"lon": ,"panoramio_zoom":0},"photos":[{"height ":32,"latitude": ,"longitude": ,"owner_id": ,"owner_name":"tincin","owner_url":" ","photo_file_url":" jpg","photo_id": ,"photo_title":"LakeNakuru","photo_url":"htt p:// ","place_id":"9d bf443d6d c315d4050","upload_date":"22 June 2012","width":32},{"height":32,"latitude": ,"longitude": ,"owner_id": ,"owner_name":"tincin","owner_url":"http://www.pan ","photo_file_url":" mio/photos/mini_square/ jpg","photo_id": ,"photo_title":"Fle mingo in Lake Nakuru","photo_url":" ","place_id":" 9d bf443d6d c315d4050","upload_date":"22 June 2012","width":32}]} User ID

22 Limits Panoramio allows 100,000 queries per day Any more, and your API ID gets revoked. If you want all the meta data from Panoramio, keep track of the number of queries in the last 24 hours, throttle your app.

23 Panoramio Results

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