Prof. Dr. Jürgen Döllner

Dr. Benjamin Hagedorn


Room:  H-2.25
Tel.: +49 (0)331 5509-3912
Fax: +49 (0)331 5509-172
Email: benjamin.hagedorn(at)hpi.uni-potsdam.de

Past Projects


Chaining Geoinformation Services for the Visualisation and Annotation of 3D Geovirtual Environments

Hagedorn, Benjamin; Maass, Stefan; Döllner, J in 4th International Symposium on LBS and Telecartography 2007 .

Visualization of 3D geovirtual environments enables users to gain insight into and to interactively operate with complex 3D geoinformation as well as to explore and analyze underlying structures, relationships, and associated thematic georeferenced data. It represents a key functionality for a growing number of applications and systems such as for way-finding, urban city planning, geo- marketing, and tourist information. For the systematic implementation of these systems, geoinformation services provide an interoperable and standardized way to access, process, and view distributed, heterogeneous 2D and 3D geospatial data. To broaden the use and scope of 3D geovirtual environments, we have to support the management and visualization of user-defined or application-defined data associated with geospatial objects. For this purpose, we can embed annotations such as texts or symbols as meta elements into images of 3D geovirtual environments. For example, annotations can represent georeferenced comments added interactively by the user to explicitly denote spatial objects and locations the comments refer to. This paper presents the design of a chain of web services for the creation of annotated perspective views. First, a Web Perspective View Service (WPVS) is outlined that synthesizes images of a given 3D geovirtual environment and delivers the images to the service consumer. Second, the Web View Annotation Service (WVAS) is introduced that processes these images as input along with a set of spatial locations and content definitions. To ensure high legibility, annotations are embedded into the view plane and placed such that they avoid occlusions among themselves and with geospatial objects of the scene. As result of this service composition, the service consumer receives an enhanced image depicting the current perspective view with seamlessly embedded annotations. We describe the design and system architecture by the example of a prototypic interactive campus information system.
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Lecture Assistance

  • 2011/12: Master Seminar "Realtime Rendering Techniques"
  • 2011: Bachelor Project "Mobile 3D Apps"
  • 2011: Master Lecture "Geovisualization"
  • 2010: Bachelor Project "SOA-based 3D Geovisualization for Mobile Applications"
  • 2010: Master Seminar on Information and Geo Visualization, Master Seminar on Software Engineering for Visualization Systems
  • 2009/10: Master Seminar Visualization, Master Seminar on Service-oriented Computing
  • 2009: Bachelor Project "Smartboard-based User-Interface for 3D City Models"
  • 2008: Master Seminar "Visualization: Concepts and Methods"
  • 2007/08: Master Seminar "Visualization"
  • 2007: Master Lecture "Visualization", Master Seminar "Visualization"
  • 2006/07: Master Seminar "Visualization"
  • 2006: Bachelor Lecture "User Interfaces"
  • 2005/06: Bachelor Lecture "Fundamentals of Computer Graphics", Master Seminar "Visualization"

Supervised Master/Diploma Thesis

  • Visualization of Building Information Models - Concept and Implementation of 3D Visualization Techniques.
  • Navigation and Object Interaction in Virtual 3D City Models based on Sketches and Gestures
  • Acquisition, Processing, Provision, and Visualization of Indoor Tracking Data
  • Concepts and Techniques for Collaborative Virtual 3D City Models
  • Design and Implementation of a Virtual 3D City Model of Historic Potsdam