Prof. Dr. Jürgen Döllner

3D Image-Based Analysis Technology

The 3D Image-Based analysis framework uses 3D virtual environment models as computational tools to determine visibility-based characteristics of these models.

Among others, this technology can be used to compute the visibility of landmarks, solar potential analysis, and “vista quality” in virtual 3D city models. 


3D Point Cloud Analysis Technology

This is a collection of methods to add information to point clouds, such as distance and local environment information.

It can be used to extract building models, detect changes in point data and visualize planning of urban areas.

3D Model Generalization Technology

This technology enables the automatic generalization of single 3D buildings, building complexes, and complete virtual cities to various cartographic scales.


3D View Service Technology

Different concepts and implementations of interactive 3D viewers that use the Web View Service (WVS), a 3D rendering service, as data source.

The concepts shield the clients from the arbitrary complexity of the geovisualization pipeline while at the same time providing interactive access to a 3DGeoVE. 


3D SOA Technology

Ensemble of services for composing service-oriented 3D geovisualization systems. Currently implemented: Web View Service (WVS, 3D rendering service).

Decomposition of the 3D geovisualization pipeline into distributed services to facilitate reuse of services and lightweight clients.


3D Panorama Map Technology

This rendering technique enables the interactive rendering and creation of multi-perspective views, such as panorama maps, for virtual 3D city and landscapes.

It enables the combination detail and overview within a single view, resolves occlusion and is suitable for navigation and orientation tasks as well as for focus + context visualization.


3D Annotation Technology

The 3D annotation Technology enables to enrich 3D virtual environments with external and embedded annotations of static and dynamic content. The technology is available as a independent library component.

Annotations are vital elements for the comprehension of virtual environments. The optimal placement with respect to the 3D scene and the annotation content is a hard computational problem.


3D Dynamic Landmark Technology

This technology provides functionality to automatically extract, modify, and visualize 3D landmarks within 3D virtual environments.

3D virtual Landmarks are an important object category that facilitates orientation and navigation within virtual environments. 


Computations on 3D Feature Surfaces

This approach proposes the use of feature surface properties (textures) as first-class elements in geocomputations (e.g., simulation, analysis in city models).

Integration of feature surface properties into GIS enables new ways to solving problems, such as solar potential or visibility analysis, in a generic fashion.


3D Smart Interaction Technology

Smart interaction technologies leverage object semantics of a virtual scene to support the control of the virtual camera and thus eases the navigation for the users. This includes the application of gestures.

Such smart interaction techniques avoid “getting lost” situations within complex virtual 3D environments and has various applications: from modern mobile devices to tourist information systems.


3D Automated Texturing Technology

Given the 3D geometry of a virtual city model and a set of oblique images of the same geographic region, this technology generates building façade and roof textures in a fully automatic way, using consumer graphics hardware.

It enables photo-texture generation for complete virtual 2D city models and represents the basis basis for derivation of non-photorealistic textures or textures encoding surface feature properties of buildings.

Collaboration Tools for 3D City Models

This technology enables communication of spatial information using 3D geovirtual environments. Same-time and time-shifted work processes can be supported by communication tools.

It is suitable for retaining the spatial reference of information over time (e.g., for public participation scenarios, communication purposes).


3D Focus-&-Context Technology

This interactive technique uses generalized clipping to combine different geometric representations (e.g., levels-of-abstraction) within a single image. It can be used to implement focus+context visualizations using 3D lenses.