technische universität münchen a user perspective on typification of facade features of 3d...
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![Page 1: Technische Universität München A User Perspective on Typification of Facade Features of 3D Building Models Mathias Jahnke Hongchao Fan Liqiu Meng ICC 2009](https://reader036.vdocuments.us/reader036/viewer/2022062409/56649f0d5503460f94c20e21/html5/thumbnails/1.jpg)
Technische Universität München
A User Perspective on Typification of Facade Features of 3D Building
Models
Mathias Jahnke
Hongchao Fan
Liqiu Meng
ICC 2009
![Page 2: Technische Universität München A User Perspective on Typification of Facade Features of 3D Building Models Mathias Jahnke Hongchao Fan Liqiu Meng ICC 2009](https://reader036.vdocuments.us/reader036/viewer/2022062409/56649f0d5503460f94c20e21/html5/thumbnails/2.jpg)
Technische Universität München
Faculty of Civil Engineering and GeodesyDepartment of Cartography
3D city model
• Buildings– Roof elements
– Facade elements
• Trees • Step structures• Streets• Textured with different kinds of pictures
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Technische Universität München
Faculty of Civil Engineering and GeodesyDepartment of Cartography
The mobile device
• Limited display size• Limited computing capabilities• Limited interactivity
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Technische Universität München
Faculty of Civil Engineering and GeodesyDepartment of Cartography
Drawbacks of a highly detailed city model
• High information density• Overlapping contours
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Technische Universität München
Faculty of Civil Engineering and GeodesyDepartment of Cartography
Information density
• Non-photorealistic rendering (NPR) seems to be favorable– Reduces the overall graphic complexity
– Highlighting of important objects
– Artistic abstraction
– Aesthetic appeal (?)
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![Page 6: Technische Universität München A User Perspective on Typification of Facade Features of 3D Building Models Mathias Jahnke Hongchao Fan Liqiu Meng ICC 2009](https://reader036.vdocuments.us/reader036/viewer/2022062409/56649f0d5503460f94c20e21/html5/thumbnails/6.jpg)
Technische Universität München
Faculty of Civil Engineering and GeodesyDepartment of Cartography
Overlapping contours
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![Page 7: Technische Universität München A User Perspective on Typification of Facade Features of 3D Building Models Mathias Jahnke Hongchao Fan Liqiu Meng ICC 2009](https://reader036.vdocuments.us/reader036/viewer/2022062409/56649f0d5503460f94c20e21/html5/thumbnails/7.jpg)
Technische Universität München
Faculty of Civil Engineering and GeodesyDepartment of Cartography
Typification
• Fusing windows within a facade
• But applying different geometric constraints– Typification in a tendency direction
– Preserving the ratio of width and height
– Preserving distances between windows
– Preserving distances between windows and the outline of the facade
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![Page 8: Technische Universität München A User Perspective on Typification of Facade Features of 3D Building Models Mathias Jahnke Hongchao Fan Liqiu Meng ICC 2009](https://reader036.vdocuments.us/reader036/viewer/2022062409/56649f0d5503460f94c20e21/html5/thumbnails/8.jpg)
Technische Universität München
Faculty of Civil Engineering and GeodesyDepartment of Cartography
Cognition
• Cognition plays an important role for visualization
• Different gestalt laws– Proximity
– Similarity
– Continuity
– Closure
– Symmetry
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Technische Universität München
Faculty of Civil Engineering and GeodesyDepartment of Cartography
Appropriate facades for typification
• Typical distribution pattern• Rectified and traced facades for evaluation
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![Page 10: Technische Universität München A User Perspective on Typification of Facade Features of 3D Building Models Mathias Jahnke Hongchao Fan Liqiu Meng ICC 2009](https://reader036.vdocuments.us/reader036/viewer/2022062409/56649f0d5503460f94c20e21/html5/thumbnails/10.jpg)
Technische Universität München
Faculty of Civil Engineering and GeodesyDepartment of Cartography
Comparison of different facade typifications
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![Page 11: Technische Universität München A User Perspective on Typification of Facade Features of 3D Building Models Mathias Jahnke Hongchao Fan Liqiu Meng ICC 2009](https://reader036.vdocuments.us/reader036/viewer/2022062409/56649f0d5503460f94c20e21/html5/thumbnails/11.jpg)
Technische Universität München
Faculty of Civil Engineering and GeodesyDepartment of Cartography
Results
Value Summarization
mostimportant
10,0 keeping the shape conform
7,0Keeping distances between window/window and window/outline
5,3keeping distances between windows/outline
4,7keeping distances between window/window
less important
4,6typification of windows only in tendency direction
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![Page 12: Technische Universität München A User Perspective on Typification of Facade Features of 3D Building Models Mathias Jahnke Hongchao Fan Liqiu Meng ICC 2009](https://reader036.vdocuments.us/reader036/viewer/2022062409/56649f0d5503460f94c20e21/html5/thumbnails/12.jpg)
Technische Universität München
Faculty of Civil Engineering and GeodesyDepartment of Cartography
Conclusion & future work
• Is a good starting point for further investigations• The approach seems to be appropriate for facade
generalization• The user have to be taken into account
• Applying the results to a 3D city model• Different viewing directions• For future evaluations increasing the group of
participants
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![Page 13: Technische Universität München A User Perspective on Typification of Facade Features of 3D Building Models Mathias Jahnke Hongchao Fan Liqiu Meng ICC 2009](https://reader036.vdocuments.us/reader036/viewer/2022062409/56649f0d5503460f94c20e21/html5/thumbnails/13.jpg)
Technische Universität München
Faculty of Civil Engineering and GeodesyDepartment of Cartography
Outlook
• Applying the results to 3D city model
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![Page 14: Technische Universität München A User Perspective on Typification of Facade Features of 3D Building Models Mathias Jahnke Hongchao Fan Liqiu Meng ICC 2009](https://reader036.vdocuments.us/reader036/viewer/2022062409/56649f0d5503460f94c20e21/html5/thumbnails/14.jpg)
Technische Universität München
Faculty of Civil Engineering and GeodesyDepartment of Cartography
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