Quality in User Generated Spatial Content Carmen Brando , Bénédicte Bucher AGILE Conference 2010 Guimarães, May 10 - 14 In...
What’s it about? Generated by: http://www.wordle.net SC : Spatial Content UGC : User Generated Content UGSC : User Generat...
What’s it about? Flickr Wikipedia Creation of Spatial Content (SC): Geotagging © IGN - 2010
What’s it about? Wikimapia OpenStreet Map Creation of Spatial Content (SC): Features Editing © IGN - 2010
What’s it about? Generated by: http://www.wordle.net SC : Spatial Content UGC : User Generated Content UGSC : User Generat...
Outline <ul><li>Quality </li></ul><ul><ul><li>in  User Generated Content  (UGC) </li></ul></ul><ul><ul><li>of  Spatial Con...
Quality in User Generated Content (UGC): Definition <ul><li>is  related to </li></ul><ul><ul><li>whether is useful or not ...
<ul><li>During Edition:  Internal Coherence and Citing External Sources </li></ul>Quality in User Generated Content (UGC):...
<ul><li>During Edition:  Authority, Comprehensiveness  and Collaboration Mechanisms </li></ul>Quality in User Generated Co...
Quality in User Generated Content (UGC): How to Improve it? <ul><li>After Edition </li></ul><ul><ul><li>Comparison with a ...
Quality in User Generated Content (UGC): How to Improve it? Users manually resolve conflicts © IGN - 2010 Conflicts Detect...
Quality of Spatial Content (SC): Definition Real World Ideal Representation (Nominal Terrain) Specifications* © IGN - 2010...
Quality of Spatial Content (SC): Definition IGN’s BD TOPO ® Knowledge about how the real world is observed and how it is m...
Quality of Spatial Content (SC): Definition Real World Ideal Representation (Terrain Nominal) Produced Data + Metadata ( S...
Quality in User Generated Spatial Content (UGSC) <ul><li>UGSC for  updating  NMA's and private mapping organizations   dat...
Quality in User Generated Spatial Content (UGSC) <ul><li>Qualification  of contributors and contributions </li></ul><ul><l...
Proposed Approach:  Specifications for UGSC? <ul><li>Certainly, this is appropriate for  NMA ’s and  private mapping organ...
Quality in UGC Quality of SC   Quality in UGSC   Proposed Approach   Conclusion & Perspectives Proposed Approach: Specific...
Proposed Approach: Specifications for UGSC? <ul><li>Done by  Keep Right! </li></ul><ul><li>http://keepright.ipax.at </li><...
Proposed Approach: Specifications for UGSC? Before After <ul><li>OSM Web Editor:  Potlatch </li></ul><ul><li>Constraint:  ...
Proposed Approach: Specifications for UGSC? <ul><li>Special interest groups  (Coote, 2008) have  </li></ul><ul><ul><li>str...
Proposed Approach:  UGSC Specifications <ul><li>Assist users  to provide  specifications  of their content for  quality ma...
Proposed Approach: Consistency Checking <ul><li>Lack of geometrical consistency  between those feature types </li></ul><ul...
Proposed Approach:  UGSC Specifications <ul><li>Assist users  to provide  specifications  of their content for  quality ma...
Proposed Approach: Reconciliation Mechanism © IGN - 2010 Changing name to ‘Avenue Bollée’ Quality in UGC Quality of SC   Q...
Conclusion <ul><li>UGSC  refers to new paradigm for  producing  SC </li></ul><ul><li>UGSC  quality management  from a  NMA...
Perspectives <ul><li>Test our approach (on-going work) in the Geoxygene Plataform:  http://oxygene-project.sourceforge.net...
<ul><li>Thank you for listening! </li></ul><ul><li>Any questions? </li></ul><ul><li>Contact information:  </li></ul><ul><u...
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Quality in User Generated Spatial Content: A Matter of Specifications

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My presentation in The 13th AGILE International Conference on Geographic Information Science (AGILE'2010), 10-14 May 2010, Guimarães, Portugal

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Quality in User Generated Spatial Content: A Matter of Specifications

  1. 1. Quality in User Generated Spatial Content Carmen Brando , Bénédicte Bucher AGILE Conference 2010 Guimarães, May 10 - 14 Institut Géographique National (IGN), France Cogit Lab. © IGN - 2010
  2. 2. What’s it about? Generated by: http://www.wordle.net SC : Spatial Content UGC : User Generated Content UGSC : User Generated Spatial Content © IGN - 2010
  3. 3. What’s it about? Flickr Wikipedia Creation of Spatial Content (SC): Geotagging © IGN - 2010
  4. 4. What’s it about? Wikimapia OpenStreet Map Creation of Spatial Content (SC): Features Editing © IGN - 2010
  5. 5. What’s it about? Generated by: http://www.wordle.net SC : Spatial Content UGC : User Generated Content UGSC : User Generated Spatial Content © IGN - 2010
  6. 6. Outline <ul><li>Quality </li></ul><ul><ul><li>in User Generated Content (UGC) </li></ul></ul><ul><ul><li>of Spatial Content (SC) </li></ul></ul><ul><ul><li>in User Generated Spatial Content (UGSC) </li></ul></ul><ul><li>Proposed Approach </li></ul><ul><li>Conclusion and Perspectives </li></ul>© IGN - 2010
  7. 7. Quality in User Generated Content (UGC): Definition <ul><li>is related to </li></ul><ul><ul><li>whether is useful or not to users’ purposes: fitness for use </li></ul></ul><ul><ul><li>users’ trust in the content: producer’s authority </li></ul></ul><ul><li>Wikipedia , best example of UGC , but… </li></ul><ul><ul><li>quality issue: users are anonymous </li></ul></ul><ul><li>Wikis , easy and fast content edition </li></ul><ul><li>More advance collaborative editing tools assure content consistency by reconciling concurrent operations </li></ul><ul><ul><li>e.g. Google Wave </li></ul></ul>© IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  8. 8. <ul><li>During Edition: Internal Coherence and Citing External Sources </li></ul>Quality in User Generated Content (UGC): How to Improve it? © IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  9. 9. <ul><li>During Edition: Authority, Comprehensiveness and Collaboration Mechanisms </li></ul>Quality in User Generated Content (UGC): How to Improve it? © IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  10. 10. Quality in User Generated Content (UGC): How to Improve it? <ul><li>After Edition </li></ul><ul><ul><li>Comparison with a Reference Source : </li></ul></ul><ul><ul><ul><li>Wikipedia vs. Encyclopedia Britannica (Nature 2005) </li></ul></ul></ul><ul><ul><li>Quantitative Measures : </li></ul></ul><ul><ul><ul><li>Number of Edits, Number of Editors, Intensity of Cooperative Behavior, Analysis of Featured Articles, etc. (Wilkinson, 2007) (Stvilia, 2005) (Mcguinness, 2006) and more… </li></ul></ul></ul><ul><ul><li>Revision History </li></ul></ul><ul><ul><li>Conflicts Detection/Reconciliation </li></ul></ul>© IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  11. 11. Quality in User Generated Content (UGC): How to Improve it? Users manually resolve conflicts © IGN - 2010 Conflicts Detection/Reconciliation Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  12. 12. Quality of Spatial Content (SC): Definition Real World Ideal Representation (Nominal Terrain) Specifications* © IGN - 2010 * Buildings of area greater than 20m2 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  13. 13. Quality of Spatial Content (SC): Definition IGN’s BD TOPO ® Knowledge about how the real world is observed and how it is modeled in the database NMA Specifications © IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  14. 14. Quality of Spatial Content (SC): Definition Real World Ideal Representation (Terrain Nominal) Produced Data + Metadata ( Specifications + Error Criteria ) Internal Quality Specifications* Production Process: Errors ** External Quality User’s Required Data * Buildings of area greater than 20m2 ** Maybe mistakes have been made or reality has evolved © IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  15. 15. Quality in User Generated Spatial Content (UGSC) <ul><li>UGSC for updating NMA's and private mapping organizations data through alerts </li></ul><ul><li>OpenStreet Map , great influence in the way SC is produced and updated </li></ul><ul><li>More recently, UGSC for complementing NMA's and private mapping organizations data through content edition (beyond simple alerts) </li></ul>(Budhathoki, 2008) (Elwood, 2008) (Antoniou, 2009) © IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  16. 16. Quality in User Generated Spatial Content (UGSC) <ul><li>Qualification of contributors and contributions </li></ul><ul><li>A contributors' classification based on </li></ul><ul><ul><li>their purposes (Coleman et al., 2009) </li></ul></ul><ul><ul><li>their geographic locations (Goodchild, 2009) </li></ul></ul><ul><ul><li>their trust relations with other users (Bishr et al., 2007) </li></ul></ul><ul><li>Distinguish between high and low value contributions </li></ul><ul><ul><li>Rating systems (Elwood, 2008) </li></ul></ul><ul><ul><li>Marking regions with problems (Maué et al., 2008) </li></ul></ul><ul><ul><li>Comparison with reference source (Haklay, 2009) </li></ul></ul>© IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  17. 17. Proposed Approach: Specifications for UGSC? <ul><li>Certainly, this is appropriate for NMA ’s and private mapping organizations </li></ul><ul><li>What about Neogeography ? </li></ul><ul><li>Neogeographers would be reluctant to provide and work according specifications </li></ul>© IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives © Scott Adams
  18. 18. Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives Proposed Approach: Specifications for UGSC? Guidelines Tags Reference Tags Reference © IGN - 2010
  19. 19. Proposed Approach: Specifications for UGSC? <ul><li>Done by Keep Right! </li></ul><ul><li>http://keepright.ipax.at </li></ul><ul><li>Predefined integrity constraints are verified on OSM data </li></ul><ul><li>For instance, intersections without junctions </li></ul>© IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  20. 20. Proposed Approach: Specifications for UGSC? Before After <ul><li>OSM Web Editor: Potlatch </li></ul><ul><li>Constraint: </li></ul><ul><li>Intersections Without Junctions </li></ul>© IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  21. 21. Proposed Approach: Specifications for UGSC? <ul><li>Special interest groups (Coote, 2008) have </li></ul><ul><ul><li>stronger requirements on data quality </li></ul></ul><ul><ul><li>budget limitations for collecting, redacting and updating specifications </li></ul></ul><ul><ul><li>lack of expertise on modeling techniques to ensure a user generated spatial content ( UGSC) consistency </li></ul></ul><ul><ul><li>interest in accepting some rules during contribution </li></ul></ul><ul><li>Therefore, assisting users to provide content specifications is important for them </li></ul>Yes We Can © IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  22. 22. Proposed Approach: UGSC Specifications <ul><li>Assist users to provide specifications of their content for quality management </li></ul><ul><li>UGSC Specifications </li></ul><ul><li>1. to support on the fly consistency checking (e.g. 'a road cannot intersect a river') </li></ul><ul><li>2. to check consistency with external reference data , reusing an existing model (Abadie, 2009) </li></ul><ul><li>3. to reconcile concurrent editions of data (e.g. 'the attribute name of a road is independent from geometry') </li></ul>© IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  23. 23. Proposed Approach: Consistency Checking <ul><li>Lack of geometrical consistency between those feature types </li></ul><ul><li>UGSC Specifications: An integrity constraint indicating the relation between these two features ( Geometry sharing ) </li></ul><ul><li>Possible Reparation: placing automatically the line boundary throughout the middle of the waterway </li></ul>OSM data corresponding to administrative boundaries and waterways around the French city of Grenoble (December 2009) © IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  24. 24. Proposed Approach: UGSC Specifications <ul><li>Assist users to provide specifications of their content for quality management </li></ul><ul><li>UGSC Specifications </li></ul><ul><li>1. to support on the fly consistency checking (e.g. 'a road cannot intersect a river') </li></ul><ul><li>2. to check consistency with external reference data , reusing an existing model (Abadie, 2009) </li></ul><ul><li>3. to reconcile concurrent editions of data (e.g. 'the attribute name of a road is independent from geometry') </li></ul>© IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  25. 25. Proposed Approach: Reconciliation Mechanism © IGN - 2010 Changing name to ‘Avenue Bollée’ Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives Adding a road segment to ‘Rue de Paris’ ?? UGSC Specification: 'the attribute name of a road is independent from geometry' Tajel © Jorge Cham Cecilia © Jorge Cham Rue de Paris Avenue Bollée
  26. 26. Conclusion <ul><li>UGSC refers to new paradigm for producing SC </li></ul><ul><li>UGSC quality management from a NMA ’s point of view </li></ul><ul><li>Users describe their content in the form of specifications to fit their purposes, if possible using reference data set </li></ul><ul><li>Users improve UGSC quality by contributing with SC in a collaborative manner </li></ul>© IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  27. 27. Perspectives <ul><li>Test our approach (on-going work) in the Geoxygene Plataform: http://oxygene-project.sourceforge.net , considering IGN data </li></ul><ul><li>Eventually elucidate which elements should be considered in UGSC metadata </li></ul>© IGN - 2010 Quality in UGC Quality of SC Quality in UGSC Proposed Approach Conclusion & Perspectives
  28. 28. <ul><li>Thank you for listening! </li></ul><ul><li>Any questions? </li></ul><ul><li>Contact information: </li></ul><ul><ul><li>[email_address] </li></ul></ul><ul><ul><li>[email_address] </li></ul></ul>© IGN - 2010
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