The document discusses the visualization and metadata exploration of sensor web data, emphasizing the creation of dynamic 3D scenes for intuitive interaction with sensor resources. It highlights the use of open standards like X3D for geographic information representation and the integration of various technologies for effective data handling. Future work aims to enhance visual capabilities and exploration methodologies within a framework that includes advanced web technologies.

1. Visualization and Level-of-detail
of Metadata for Interactive
Exploration of Sensor Web
Byounghyun Yoo
Center for Environmental Sensing and Modeling
Singapore-MIT Alliance for Research and Technology

2. Sensor web
Illustration by Matt Heavner (2007)
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3. Sensor data exploration
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4. 2D map mashup
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5. Goal
• Intuitive exposure of metadata for sensor resources
Text-based Interactive
query interface exploration
• Dynamic 3D scene of sensor information
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6. Related work
• Aditya 2007, Aim4GDI: Mapping and
superimpositions of metadata summaries
• Wood 2007, Interactive visual exploration of a
large spatio-temporal dataset
• Dörk 2008, VisGets: Coordinated visualization
for Web-based information exploration
• Sandvik 2008, Using KML for thematic mapping
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7. VisGets
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8. 3D thematic mapping

9. Design goal
• Enable casual formulation of geospatial
semantic queries
• Summarize information collections visually
• Use integrated dynamic visualization
• Optimize the amount of data transmission
• Conform to open standards for
interoperability 9

10. Level-of-detail of metadata
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11. Dynamic 3D scene &
implicit query
Sensor information Geospatial query
?
Interactive 3D scene
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12. Architecture
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13. X3D Geospatial Component
• All the benefits of X3D
• Open royalty-free ISO-approved Web
standards
• Partnerships with OGC and W3C
• Choice of implementations and tools
• Scripting capabilities
• Powerful browsers
• Geospatial accuracy (WGS84, UTM, etc.)
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14. Use case
• Search and exploration of sensor
resources
• PWS project
• 34,700 personal weather stations
• Local weather stations
• 32 micro weather stations
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15. Metadata extraction
<location>
*<full>Sunnyside,*San*Francisco,*CA</full>
*<neighborhood>Sunnyside</neighborhood>
*<city>San*Francisco</city>
*<state>CA</state>
*<zip/>
*<latitude>37.732376</latitude>
*<longitude>B122.442902</longitude>
*<elevation>364*ft</elevation>
</location>
<station_id>KCASANFR70</station_id>
<station_type>Vantage*Pro</station_type>
<observation_time>Last*Updated*on*July*23,*11:04*PM*PDT</observation_time>
<observation_time_rfc822>Sun,*24*Jul*2011*06:04:50*GMT</observation_time_rfc822>
<weather/>
<temperature_string>56.7*F*(13.7*C)</temperature_string>
<temp_f>56.7</temp_f>
<temp_c>13.7</temp_c>
<relative_humidity>94</relative_humidity>
<wind_string>Calm</wind_string>
<wind_dir>West</wind_dir>
<wind_degrees>269</wind_degrees>
<wind_mph>0.0</wind_mph>
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16. World border dataset
ID Serial Unique ID
FIPS String (2) FIPS 10-4 Country Code
ISO2 String (2) ISO 3166-1 Alpha-2 Country Code
ISO3 String (3) ISO 3166-1 Alpha-3 Country Code
UN Short Integer (3) ISO 3166-1 Numeric-3 Country Code
Name String (50) Name of country/area
Area Long Integer (7) Land area, FAO Statistics (2002)
POP2005 Double (10, 0) Population, World population Prospects
Region Short Integer (3) Macro geographical (continental region)
Subregion Short Integer (3) Geographical sub-region, UN statistics
Lon Float (7, 3) Longitude
Lat Float (7, 3) Latitude
Geometry Multi-Polygon Country/area border as polygon
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17. Visualization template
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18. Visualization template

19. Visualization template

20. Visualization template

21. X3D/XML encoding
<GeoLocation+geoCoords='".$latitude."+".$longitude."+0'
geoSystem='GDC'>
<Transform+translation='0+".($scale/4)."+0'>
<Shape>
<Cylinder+height='".($scale/2)."'+radius='".$scale."'/>
<Appearance>
<Material+diffuseColor='".$color."'+emissiveColor='1+0+0'
transparency+=+'0.4'/>
</Appearance>
</Shape>
</Transform>
</GeoLocation>
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22. Conclusion
• A visual exploration interface for
metadata of sensor web
• Dynamic geospatial query and 3D scene
• Mashups with the X3D-based earth globe
Two-dimensional Three-dimensional
space with text space with visual
based search media navigation
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23. Future work
★ Seamless dynamic exploration
• Extend visual representation and query
variations
• X3D node specification
• New framework: HTML5, CSS3
• Include X3D elements as part of
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24. Thank you

25. Content
• Introduction
• Previous work
• Design of metadata visualization
• Progress
• Future work
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26. Sensor resources
• Discovery
• Exploration
• Sharing
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27. Digital earth
Digital earth system should not be a single
virtual globe, but multiple globes with
interconnected infrastructure.
Each globe can be specially designed by
producers has a distinct set of needs.
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28. 3D Geo-browser
• Google Earth
• Pro: KML, easy to use, broad
acceptance
• Con: Limited functionality & API
• Alternatives
• Other geo-browsers
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29. Sensor data exploration
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30. Sensor data discovery
• Ordinary text query
• Tree-based hierarchical exploration
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31. Standard technologies
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32. X3D Earth globe
• X3D standard v3.2
• Full-coverage, full-detail X3D-Earth globe
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33. Metadata
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