PARTICIPATORY GIS: EXPERIMENTATIONS FOR A 3D SOCIAL VIRTUAL GLOBE M. A. Brovelli, M. Minghini, and G. Zamboni

1. Geomatics Laboratory
Como Campus
Participatory GIS: experimentations
for a social 3D virtual globe
Maria Antonia Brovelli, Marco Minghini, Giorgio Zamboni
Politecnico di Milano, DICA – Geomatics Laboratory at Como Campus

2. Virtual globes
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✔ Virtual globes
➔
software allowing to explore the Earth in three dimensions while streaming
satellite imagery, elevation and other data from the Internet
➔
user freedom to move around the globe and interact with it
➔
multi-disciplinary, multi-resolution and multi-dimensional (even 4D)
➔
context capability, ease of use, realistic user experience
➔
growing popularity due to increased Internet availability of geospatial data
(e.g. aerial and satellite imagery, topographic maps and DTMs)
Geomatics Laboratory, Politecnico di Milano – Como Campus

3. Virtual globes
✔ Many of them are available
Geomatics Laboratory, Politecnico di Milano – Como Campus
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4. Virtual globes
✔ Many of them are available
Geomatics Laboratory, Politecnico di Milano – Como Campus
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5. NASA World Wind
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✔ NASA's virtual globe
➔
http://goworldwind.org
➔
free and open source under NASA Open Source Agreement (NOSA) license
➔
Java Software Development Kit (SDK)
➔
multi-platform (Java: “Write once, run anywhere”)
➔
3D Web visualization as Java Application, Java Applet or Java Web Start
Application
➔
based on open standards, accommodates any desired data format
✔ Main features
➔
accuracy control of horizontal (texture) and vertical (DTM) components
➔
upload layers from OGC-compliant WMS servers
➔
default WMS layers (i.e. satellite imagery and DTMs) from NASA and USGS
➔
2D objects (e.g. lines and polygons) and 3D objects (e.g. parallelepipeds and
spheres) can be placed on the globe or in its surroundings
Geomatics Laboratory, Politecnico di Milano – Como Campus

6. PoliCrowd
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✔ PoliCrowd is a Web-based 3D Participatory GIS application
➔
born to promote tourism and cultural heritage
➔
interaction with user mobile devices for uploading Points Of interest (POIs)
➔
POIs three-dimensional visualization on World Wind virtual globe
➔
user collaborative contribution in POIs characterization
➔
creating, saving and sharing customized maps with the community
http://geomobile.como.polimi.it/policrowd
Geomatics Laboratory, Politecnico di Milano – Como Campus

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PoliCrowd architecture
SERVER
CLIENT
WMS
template form
AGGREGATE
compiled form
Geomatics Laboratory, Politecnico di Milano – Como Campus
COLLECT

8. Field-data collection
✔ Guided form compilation
Geomatics Laboratory, Politecnico di Milano – Como Campus
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COLLECT

9. Field-data collection
✔ Guided form compilation
Geomatics Laboratory, Politecnico di Milano – Como Campus
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COLLECT

10. Field-data collection
✔ Guided form compilation
Geomatics Laboratory, Politecnico di Milano – Como Campus
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COLLECT

11. Field-data collection
✔ Guided form compilation
Geomatics Laboratory, Politecnico di Milano – Como Campus
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COLLECT

12. Field-data collection
✔ Guided form compilation
Geomatics Laboratory, Politecnico di Milano – Como Campus
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COLLECT

13. Field-data collection
✔ Guided form compilation
Geomatics Laboratory, Politecnico di Milano – Como Campus
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COLLECT

14. Field-data collection
✔ Guided form compilation
Geomatics Laboratory, Politecnico di Milano – Como Campus
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COLLECT

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PoliCrowd architecture
WMS
server
WWW
CLIENT
SERVER
JSP / SERVLETS
WMS / KML
Geomatics Laboratory, Politecnico di Milano – Como Campus
JAVA Web Start

16. 3D data visualization
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✔ Points Of Interest (POIs) 3D visualization on top of World Wind
➔
3 Levels Of Detail according to the altitude of the point of view on the globe
✔
✔
first LOD: representation of all the POIs with a common icon (i.e. a pin)
Geomatics Laboratory, Politecnico di Milano – Como Campus

17. 3D data visualization
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✔ Points Of Interest (POIs) 3D visualization on top of World Wind
➔
3 Levels Of Detail according to the altitude of the point of view on the globe
✔
✔
second LOD: representation of POIs with icons showing their category
Geomatics Laboratory, Politecnico di Milano – Como Campus

18. 3D data visualization
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✔ Points Of Interest (POIs) 3D visualization on top of World Wind
➔
3 Levels Of Detail according to the altitude of the point of view on the globe
✔
✔
third LOD: representation of POIs with icons showing their classification
Geomatics Laboratory, Politecnico di Milano – Como Campus

19. 3D data visualization
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✔ Querying Points Of Interest
➔
clickable POIs placemarks
➔
visualization of Android ODK Collect-reported information in a balloon
Geomatics Laboratory, Politecnico di Milano – Como Campus

20. User interaction with POIs
✔ View page for non registered users
Geomatics Laboratory, Politecnico di Milano – Como Campus
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21. User interaction with POIs
✔ View page for registered users
Geomatics Laboratory, Politecnico di Milano – Como Campus
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22. User interaction with POIs
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✔ Add/edit comments and multimedia contents (registered users only)
Geomatics Laboratory, Politecnico di Milano – Como Campus

23. Adding WMS layers
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✔ Adding layers from available WMS servers
➔
users have to enter a valid WMS server URL and then select from the list the
desired layer(s)
➔
all the WMS layers added to a PoliCrowd projec feed a catalogue available
for the whole community
Geomatics Laboratory, Politecnico di Milano – Como Campus

24. Creating/saving projects
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✔ Creation of a new PoliCrowd project
➔
registered users can create a new project, entering a name and a description
✔ Saving a PoliCrowd project
➔
storage of the current layers, the position (i.e. latitude, longitude and
altitude) and the camera orientation of the point of view over the globe
✔ Visualization of user-created projects
➔
all the created project feed a catalogue available for the whole community
➔
the catalogue keeps trace of the project owner
➔
all users can visualize PoliCrowd projects
➔
project owners have also editing options available
Geomatics Laboratory, Politecnico di Milano – Como Campus

25. Projects catalogue
✔ Visualization of user-created projects
Geomatics Laboratory, Politecnico di Milano – Como Campus
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26. NASA World Wind Europe Challenge
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✔ Second NASA World Wind Europe Challenge in 2014 (1st edition in 2013)
➔
http://eurochallenge.como.polimi.it
Geomatics Laboratory, Politecnico di Milano – Como Campus

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Contacts
Thanks for your attention!
Marco Minghini
Politecnico di Milano
Laboratorio di Geomatica - Polo Territoriale di Como
Via Valleggio 11, 22100 Como (Italy)
marco.minghini@polimi.it
Geomatics Laboratory, Politecnico di Milano – Como Campus