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
Exploring the Future Potential of AI-Enabled Smartphone Processors
Orthoimage or map visualization in use in geoportals - Case Study on the French Geoportal, C.Hoarau, Autocarto 2012
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
7. THE GÉOPORTAIL API
7
Providing cartographic interactive tools
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AutoCarto Conference
Charlotte Hoarau
8. THE GÉOPORTAIL API
8
Providing reference data
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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
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Charlotte Hoarau
12. 12
COLLECTED INFORMATION
18th Sept 2012
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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
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Charlotte Hoarau
0.00
20.00
40.00
60.00
80.00
100.00
Websitepercentages
15. BY DEFAULT CARTOGRAPHIC VISUALIZATION
1518th Sept 2012
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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
24. MIXING BASE MAPS BY TRANSPARENCY
2418th Sept 2012
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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
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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
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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
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Charlotte Hoarau