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Scalable Realtime Rendering and Interaction with Digital Surface Models of Landscapes and Cities

dc.contributor.advisorKlein, Reinhard
dc.contributor.authorWahl, Roland
dc.date.accessioned2020-04-22T22:28:36Z
dc.date.available2020-04-22T22:28:36Z
dc.date.issued14.09.2016
dc.identifier.urihttp://hdl.handle.net/20.500.11811/6883
dc.description.abstractInteractive, realistic rendering of landscapes and cities differs substantially from classical terrain rendering. Due to the sheer size and detail of the data which need to be processed, realtime rendering (i.e. more than 25 images per second) is only feasible with level of detail (LOD) models. Even the design and implementation of efficient, automatic LOD generation is ambitious for such out-of-core datasets considering the large number of scales that are covered in a single view and the necessity to maintain screen-space accuracy for realistic representation. Moreover, users want to interact with the model based on semantic information which needs to be linked to the LOD model.
In this thesis I present LOD schemes for the efficient rendering of 2.5d digital surface models (DSMs) and 3d point-clouds, a method for the automatic derivation of city models from raw DSMs, and an approach allowing semantic interaction with complex LOD models.
The hierarchical LOD model for digital surface models is based on a quadtree of precomputed, simplified triangle mesh approximations. The rendering of the proposed model is proved to allow real-time rendering of very large and complex models with pixel-accurate details. Moreover, the necessary preprocessing is scalable and fast.
For 3d point clouds, I introduce an LOD scheme based on an octree of hybrid plane-polygon representations. For each LOD, the algorithm detects planar regions in an adequately subsampled point cloud and models them as textured rectangles. The rendering of the resulting hybrid model is an order of magnitude faster than comparable point-based LOD schemes.
To automatically derive a city model from a DSM, I propose a constrained mesh simplification. Apart from the geometric distance between simplified and original model, it evaluates constraints based on detected planar structures and their mutual topological relations. The resulting models are much less complex than the original DSM but still represent the characteristic building structures faithfully.
Finally, I present a method to combine semantic information with complex geometric models. My approach links the semantic entities to the geometric entities on-the-fly via coarser proxy geometries which carry the semantic information. Thus, semantic information can be layered on top of complex LOD models without an explicit attribution step.
All findings are supported by experimental results which demonstrate the practical applicability and efficiency of the methods.
dc.language.isoeng
dc.rightsIn Copyright
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectComputergrafik
dc.subjectEchtzeitdarstellung
dc.subjectStadtmodell
dc.subjectLandschaftsmodell
dc.subjectdigitales Oberflächenmodell
dc.subjectSkalierbarkeit
dc.subjectInteraktion
dc.subjectComputer Graphics
dc.subjectDSM
dc.subjectCity Model
dc.subjectTerrain Model
dc.subject.ddc004 Informatik
dc.titleScalable Realtime Rendering and Interaction with Digital Surface Models of Landscapes and Cities
dc.typeDissertation oder Habilitation
dc.publisher.nameUniversitäts- und Landesbibliothek Bonn
dc.publisher.locationBonn
dc.rights.accessRightsopenAccess
dc.identifier.urnhttps://nbn-resolving.org/urn:nbn:de:hbz:5n-44758
ulbbn.pubtypeErstveröffentlichung
ulbbn.birthnameBeer
ulbbnediss.affiliation.nameRheinische Friedrich-Wilhelms-Universität Bonn
ulbbnediss.affiliation.locationBonn
ulbbnediss.thesis.levelDissertation
ulbbnediss.dissID4475
ulbbnediss.date.accepted2016-07-21
ulbbnediss.instituteMathematisch-Naturwissenschaftliche Fakultät : Fachgruppe Informatik / Institut für Informatik
ulbbnediss.fakultaetMathematisch-Naturwissenschaftliche Fakultät
dc.contributor.coRefereeSchilling, Andreas


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