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Antoine Masse, Sidonie Christophe IGN, COGIT Laboratory
France
GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015
GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015 2
• Coastal area Between highest astronomical tide (shoreline) and lowest astronomical tide (drying line)
• Spatio-temporal objects & phenomena • Uncertainty: in motion (tides, sands) • Incompleteness of data: underwater observation problems • Imprecision: different definitions of an object at different scale
Sea/Land interface
Shoreline Drying line
Point Reyes, California
Red : DTM data (res. 1m, prec. 0,2m)
Yellow : 1:15,000 topomap Blue : 1:50,000 topomap
Motivation: coastal area geovisualization
Different Shoreline definition
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Different uses & users Different geovis
Limitations: Visual discontinuities and heterogeneity between sea & land Perception of tides and/or water depth for non-specialist users
C-Map®, navigation software
ScanLittoral®, Touristic/Public map
Interactive elevation simulation of lake Erie, USA (NOAA)
Ortho-image of La Grande Motte, Google Maps®
Ocean seafloor map of Hawai'i
GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015
Motivation: coastal area geovisualization
Purpose of the talk
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• To convey sea dynamic information to users
Example of tide dynamic for informational purposes
• Hypothesis:
– Using heterogeneous data (maps, ortho-imagery, LiDAR)…
– … to make homogeneous visualizations between sea & land
– … by controlling photo-realism/abstraction
– … to convey tides & water depth perception
GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015
Implementation
GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015 5
Lidar acquisition (land/sea) SHOM
0
5
10Water elevation (in meters)
Tidal data, REFMAR® project
DTM (land/sea) SHOM
Resolution: 1m/5m (land/sea) Vertical precision: 0.2m/0.5m (land/sea)
Style
Rendering Engine
Final Rendering
Perception
Geographic feature
External data
Visual Variables
Inspiration sources Colors, …
Maps, ortho-imagery, …
Abstraction, ortho-image-realism
Proposition of geovisualizations
6 GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015
4 examples for water depth visualization, static and dynamic Same data, different stylization of water depth: - Abstraction maps - (Ortho) photo-realism
0
5
10Water elevation (in meters)
Data
Inspiration
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Inspiration: Map abstraction (1:25,000)
Location: Lanildut, Finistère, France Data: DTM: Litto3D OpenData Tidal data: REFMAR OpenData Cartographic database Color map
1st example: perception of water depth by intervals
Low tide 05/28/2009 14:00
Depth (m) 0 -5 -10 -20
Color
Uses: Tourism, Hiking, Fishing Issues: ≠ producers ≠ uses no tidal information (ex: accessibility of Ile de Melon)
GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015
High tide 05/28/2009 19:00
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1st example: perception of water depth intervals
Time x4000
GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015
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Inspiration: Map abstraction
2nd example: continuous
perception of water depth
Location: Lanildut, Finistère, France Data: DTM: Litto3D OpenData Tidal data: REFMAR OpenData Cartographic database Colormap (interpolated)
Low tide 05/28/2009 14:00
High tide 05/28/2009 19:00
GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015
Depth (m) 0 -5 -10 -20
Color
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2nd example: continuous perception of water depth
Time x4000
GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015
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Inspiration: Ortho-image photo-realism
Location: Lanildut, Finistère, France Data: DTM: Litto3D OpenData Tidal data: REFMAR OpenData IGN BD Ortho (land part) Colormap (interpolated)
3rd example: continuous water depth perception
Depth (m) 0 -5 -10 -20
Color
Uses: Exploration, landscape survey, … Issues: Color gaps Depth gaps no tidal information visualization of a specific tidal stage
Low tide 05/28/2009 14:00
High tide 05/28/2009 19:00
GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015
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3rd example: water depth perception
Brightness +20% Contrast +40% Time x4000
GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015
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Location: Vannes, Morbihan, France Data: DTM: Litto3D® OpenData Tidal data: REFMAR® OpenData IGN BD Ortho® (land part) Colormap (interpolated)
4th example: water depth perception
Depth (m) 0 -5 -10 -20
Color
Uses: Exploration, landscape survey, … Issues: Sands Sea infiltration at high tide
High tide 03/21/2015 16:30
Low tide 03/21/2015 10:20
GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015
Inspiration: Ortho-image photorealism
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4th example: water depth perception
Brightness +20% Contrast +40% Time x4000
GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015
Conclusion
GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015 15
Goal: Convey sea dynamic information to geovisualization users Thoughts for coastal geovisualization: • Important: Data precision and land/sea visual continuity
improve water depth perception • Static and dynamic visualization -> different use, complementary • Abstraction/Photo-realism: same data, different stylization
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- User Evaluation: uses and users? • readability, handling, adaptation to specific use,
integration in final-user applications, etc. • Task examples: How deep it is? When is it accessible?
- Tool adaptability • Other data for validation • Realism improvements
• With new data (ex: seafloor cover) • With new stylization tools (expressive textures like
waves and sea stream, shaded relief)
Perspectives
Our method with other data Carmel-by-the-sea, CA, USA
NOAA for DTM (sea) / Google Maps (land)
Shaded relief (Yu, 2005)
GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015 Water texture
Thanks
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mapstyle.ign.fr antoinemasse.fr oxygene-project.sourceforge.net/
nice software nice project nice speaker
GeoVIS 2015 - ISPRS Geospatial Week - 10/01/2015