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Orthoimage or map visualization in use in geoportals - Case Study on the French Geoportal, C.Hoarau, Autocarto 2012
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Orthoimage or map visualization in use in geoportals - Case Study on the French Geoportal, C.Hoarau, Autocarto 2012

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This paper sets out the results of a statistical analysis of a survey on a panel of 45 …

This paper sets out the results of a statistical analysis of a survey on a panel of 45
cartographic websites using the API of the French Géoportail. Existing design choices, such as
favored base maps, transparency levels of the displayed layers, scale visualization, have been
studied from mixed representations in use. They have also been faced to the aim of the related
applications, the user’s tasks (data visualization and interaction) and their resulting uses in order
to define general trends about mixed representations.

http://www.citeulike.org/user/Charlotte_Hoarau/article/11333035

Published in: Technology, Education

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  • 1. AutoCarto Conference 2012 – 18th September 2012 Charlotte Hoarau PhD Student at COGIT Lab Supervisors : Sébastien Mustière, Sidonie Christophe ORTHOIMAGE OR MAP VISUALIZATION IN USE IN GEOPORTALS Case study on the French Geoportal
  • 2. CONTEXT 18th Sept 2012 2  Mixed / hybrid / blended / crossed cartographic representations and interactive tools AutoCarto Conference Charlotte Hoarau Are they a technical opportunity? a popular trend? Or a really efficient new cartographic representation?
  • 3. OUR APPROACH 3  Looking at existing visualizations  Statistical study on cartographic websites  Questioning the fitness for use of these representations  Identifying design guidelines to build these representations 18th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 4. OUTLINE 4  Website survey panel & collected information  By-default visualizations  Confronting uses & users with cartographic representations 18th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 5. OUTLINE 5  Website survey panel & collected information  By-default visualizations  Confronting uses & users with cartographic representations 18th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 6. THE GÉOPORTAIL INFRASTRUCTURE 618th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 7. THE GÉOPORTAIL API 7  Providing cartographic interactive tools 18th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 8. THE GÉOPORTAIL API 8  Providing reference data 18th Sept 2012 AutoCarto Conference Charlotte Hoarau City Map Topographic Map Road Map Road Map Political Map Physical Map Very Large Scales Large Scales Medium Scales Small Scales Very Small Scales Very Small Scales
  • 9. THE GÉOPORTAIL API 9  Providing reference data 18th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 10. SURVEY PANEL 10  45 selected websites based on the Géoportail API 18th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 11. SURVEY PANEL  45 selected websites based on the Géoportail API  Varied cartographic applications  Design representation  Targeted audience  Main themes 1118th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 12. 12 COLLECTED INFORMATION 18th Sept 2012 AutoCarto Conference Charlotte Hoarau URLaddressName Affiliated organism Theme&Audience Scale Bydefault visualization Thematic data Loading data Exportdata Visibility, Ordering& Transparency Interactive tools Location IGN DB Usestatistics
  • 13. OUTLINE 13  Website survey panel & collected information  By-default visualizations  Confronting uses & users with cartographic representations 18th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 14. AVAILABILITY OF GÉOPORTAIL DATA 14  Available layers 18th Sept 2012 AutoCarto Conference Charlotte Hoarau 0.00 20.00 40.00 60.00 80.00 100.00 Websitepercentages
  • 15. BY DEFAULT CARTOGRAPHIC VISUALIZATION 1518th Sept 2012 AutoCarto Conference Charlotte Hoarau Background Thematic data
  • 16. BY DEFAULT BACKGROUND 16  Predominance of topographic maps display  20% mixed representations 18th Sept 2012 AutoCarto Conference Charlotte Hoarau How base maps are mixed to design background layers? IGN maps IGN maps & imagery IGN imagery google relief OSM & relief other
  • 17. EXISTING BACKGROUNDS 17 IGN Map under Imagery IGN Imagery under map 18th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 18. EXISTING BACKGROUNDS 18 IGN Map under Imagery IGN Imagery under map Non mixed background Map 100% Imagery 0% Imagery 100% Map 0% 18th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 19. EXISTING BACKGROUNDS 19 IGN Map under Imagery IGN Imagery under map Non mixed background Map 100% Imagery 0% Imagery 100% Map 0% Moderately mixed background Map 100% Imagery 50% Imagery 100% Map 30% 18th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 20. EXISTING BACKGROUNDS 20 IGN Map under Imagery IGN Imagery under map Non mixed background Map 100% Imagery 0% Imagery 100% Map 0% Moderately mixed background Map 100% Imagery 50% Imagery 100% Map 30% Mixed backgrounds Map 100% Imagery 80% Imagery 100% Map 70% 18th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 21. EXISTING BACKGROUNDS 21 IGN Map under Imagery IGN Imagery under map Non mixed background Map 100% Imagery 0% Imagery 100% Map 0% Moderately mixed background Map 100% Imagery 50% Imagery 100% Map 30% Mixed backgrounds Map 100% Imagery 80% Imagery 100% Map 70% Faded Mixed backgrounds Map 50% Imagery 30% Imagery 70% Map 60%18th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 22. EXISTING BACKGROUNDS 22 IGN Map under Imagery IGN Imagery under map Non mixed background Map 100% Imagery 0% Imagery 100% Map 0% Moderately mixed background Map 100% Imagery 50% Imagery 100% Map 30% Mixed backgrounds Map 100% Imagery 80% Imagery 100% Map 70% Faded Mixed backgrounds Map 50% Imagery 30% Imagery 70% Map 60%18th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 23. 50% 30% 13% 7% Non mixed backgrounds Moderately mixed backgrounds Mixed backgrounds Faded mixed backgrounds DEFAULT BACKGROUND MIX 2318th Sept 2012 AutoCarto Conference Charlotte Hoarau How much are base maps mixed in existing backgrounds??
  • 24. MIXING BASE MAPS BY TRANSPARENCY 2418th Sept 2012 AutoCarto Conference Charlotte Hoarau 0 10 20 30 40 50 60 70 80 90 100 11 1 2 8 9 22 50 10 31 5 15 18 20 35 42 46 Transparencylevel Websites Id Map Imagery MapBackground Fadedmixedrepresentations ImageryBackground Hard to find a consensus on mixed design
  • 25. OUTLINE 25  Website survey panel & collected information  By-default visualizations  Confronting uses & users with cartographic representations 18th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 26. RELEVANT DESIGN CHARACTERISTICS OF VISUALIZATIONS IN USE 2618th Sept 2012 AutoCarto Conference Charlotte Hoarau Map & Imagery mixed background Map Background Imagery background Transparent Map No Map transparency Opaque Map Opaque Imagery Transparent Imagery No Imagery Transparency Adaptive Map No Map Physical map Topographic MapRoad Map Very small scale Big scaleSmall Scale Adaptive Scale Imagery background Topographic Map background Adaptive applications Fixed scale applications
  • 27. CONFRONTING USERS TO DESIGN CHOICES 2718th Sept 2012 AutoCarto Conference Charlotte Hoarau Map & Imagery mixed background Map Background Imagery background Transparent Map No Map transparency Opaque Map Opaque Imagery Transparent Imagery No Imagery Transparency Adaptive Map No Map Physical map Topographic MapRoad Map Very small scale Big scaleSmall Scale Adaptive Scale Imagery background Topographic Map background Adaptive applications Fixed scale applications Geomatics Tracks Tourism History Education Real Estate Sustainable Development Hiking
  • 28. CONFRONTING USES TO DESIGN CHOICES 2818th Sept 2012 AutoCarto Conference Charlotte Hoarau Map & Imagery mixed background Map Background Imagery background Transparent Map No Map transparency Opaque Map Opaque Imagery Transparent Imagery No Imagery Transparency Adaptive Map No Map Physical map Topographic MapRoad Map Very small scale Big scaleSmall Scale Adaptive Scale Geomatics Tracks Tourism History Education Real Estate Sustainable Development Hiking Imagery background Topographic Map background Adaptive applications Fixed scale applications Map Imagery Cadastral Parcels Elevation Hydrography Roads Administrative Limits
  • 29. CONCLUSION 29  Mixed cartographic representations  Increased use of imagery background  High diversity of existing designs  Design guidelines identified  Mixed design issues  What is a base map?  Is overlapping by transparency consistent? 18th Sept 2012 AutoCarto Conference Charlotte Hoarau
  • 30. PERSPECTIVES 3018th Sept 2012 AutoCarto Conference Charlotte Hoarau  Intermediate / “In-between” cartographic representations
  • 31. AutoCarto Conference 2012 – 18th September 2012 Charlotte Hoarau charlotte.hoarau@ign.fr