Prof. Dr. Jürgen Döllner
Amir Semmo



Tel.: +49-(0)331 5509-3909
Fax: +49-(0)331 5509-172
Room: H-2.26
Email: amir.semmo(at)hpi.de

Research Interests

Non-Photorealistic Rendering (NPR)
Real-Time Rendering & Shading
Computational Aesthetics
Cartographic Design
Virtual 3D City Models


An Interaction Framework for Level-of-Abstraction Visualization of 3D Geovirtual Environments

Semmo, Amir; Döllner, Jürgen in Proceedings 2nd ACM SIGSPATIAL Workshop on MapInteraction page 43--49 . 2014 .

3D geovirtual environments constitute effective media for the analysis and communication of complex geospatial data. Today, these environments are often visualized using static graphical variants (e.g., 2D maps, 3D photorealistic) from which a user is able to choose from. To serve the different interests of users in specific information, however, the spatial and thematic granularity at which model contents are represented (i.e., level of abstraction) should be dynamically adapted to the user's context, which requires specialized interaction techniques for parameterization. In this work, we present a framework that enables interaction interfaces to parameterize the level-of-abstraction visualization according to spatial, semantic, and thematic data. The framework is implemented in a visualization system that provides image-based rendering techniques for context-aware abstraction and highlighting. Using touch and natural language interfaces, we demonstrate its versatile application to geospatial tasks, including exploration, navigation, and orientation.
Further Information
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  • An Interaction Framework for Level-of-Abstraction Visualization of 3D Geovirtual Environments - held at ACM SIGSPATIAL MapInteract 2014, Dallas, TX - USA (11/2014)
  • Image Filtering for Interactive Level-of-Abstraction Visualization of 3D Scenes - held at Expressive 2014, Vancouver - Canada (08/2014)
  • Evaluating the Perceptual Impact of Rendering Techniques on Thematic Color Mappings in 3D Virtual Environments - held at VMV 2013, Lugano - Switzerland (09/2013)
  • Real-Time Rendering of Water Surfaces with Cartography-Oriented Design - held at Expressive 2013, Anaheim, CA - USA (07/2013)
  • Cartography-Oriented Visualization of Virtual 3D City Models based on Level-of-Abstraction Transitions - held at HPI Research School, Potsdam - Germany (06/2012)
  • Interactive Visualization of Generalized Virtual 3D City Models using Level-of-Abstraction Transitions - held at EuroVis 2012, Vienna - Austria (06/2012)
  • Colonia3D - held at Kultur und Informatik Conference, Berlin - Germany (05/2011)
  • Ansätze zur kartographischen Gestaltung von 3D-Stadtmodellen - held at 31. Wissenschaftlich-Technische Jahrestagung der DGPF, Mainz - Germany (04/2011)
  • Automated Image-Based Abstraction of Aerial Images - held at AGILE Conference, Guimarães - Portugal (05/2010)


  • SoSe 2014: Seminar Image & Video Processing
    (with Sebastian Pasewaldt, Matthias Trapp)
  • WiSe 2013/14: Seminar Geovisualization
    (with Rico Richter)
  • SoSe 2013: Graphics Programming with OpenGL and C++
    (with Daniel Limberger, Stefan Buschmann)
  • WiSe 2012/13: Computergrafik II
    (with Daniel Limberger, Jürgen Döllner)
  • SoSe 2012: Exercises for 3D-Computergrafik I
    (with Jan Eric Kyprianidis, Matthias Trapp)
  • WiSe 2011/12: Exercises for Computergrafik II
    (with Matthias Trapp, Christine Lehmann, Jan Eric Kyprianidis)
  • WiSe 2011/12: Seminar Real-Time Rendering Techniques
    (with Rico Richter, Juri Engel)


  • ACM SIGGRAPH (2014)
  • Eurographics Conference on Visualization / EuroVis (2014)
  • IEEE Pacific Visualization (2013)
  • International Journal of Geographical Information Science (2013)
  • The Visual Computer (2012)