Effective Visualization of Short Routes

Degener, Patrick; Schnabel, Ruwen; Schwartz, Christopher; Klein, Reinhard

doi:10.1109/tvcg.2008.124

Cited by 11 publications

(7 citation statements)

References 24 publications

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“…This multi-perspective rendering technique can increase the visibility of the FOIs and landmarks, but it is a time-consuming process, and it causes large distortions of other objects in 3D urban environments. Degener et al [2] introduced a space-deformation based camera model tailored to display short routes by showing the entire path contiguously, as observed from an egocentric perspective within a single image. However, the large distortions of the resulting zigzagging and twisted routes often caused misleading navigation for users.…”

Section: Visualization Of Foimentioning

confidence: 99%

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Occlusion-Free Visualization of Important Geographic Features in 3D Urban Environments

Zhang¹,

Zhang²,

Xu³

2016

IJGI

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Abstract:Modern cities are dense with very tall buildings, which often leads to features of interest (FOIs, e.g., relevant roads and associated landmarks) being occluded by clusters of buildings. Thus, from any given point of view, users can see only a small area of the city. However, it is currently an important technical problem to maintain the visibility of FOIs while preserving the urban shapes and spatial relationships between features. In this paper, we present a novel automatic visualization method to generate occlusion-free views for FOIs in real time. Our method integrates with three effective cartographic schemes: route broadening, building displacement, and building scaling, using an optimization framework A series of distortion energies are presented to preserve the urban resemblance, considering the view position and the urban features based on spatial cognition to maintain spatial and temporal coherence. Our approach can be used to visualize large urban environments at interactive framerates in which the visibility of the occluded FOIs is maximized while the deformation of the landscape's shape is minimized. Using this approach, the visual readability of such 3D urban maps can be much improved.

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Section: Visualization Of Foimentioning

confidence: 99%

“…A user must locate his/her position and orient the map properly [1]. Second, a correspondence between the map and the environment must be established [2,3]. Humans accomplish this by identifying and matching landmarks in a scene with their map representations [4].…”

Section: Introductionmentioning

confidence: 99%

Occlusion-Free Visualization of Important Geographic Features in 3D Urban Environments

Zhang¹,

Zhang²,

Xu³

2016

IJGI

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“…Deformation techniques [11,33] preserve the original topology of the dataset, whereas explosion techniques [5,26] do not. Deformation techniques are suitable when there exists adequate access to the occluded subset.…”

Section: Prior Workmentioning

confidence: 99%

An evaluation of 3-D scene exploration using a multiperspective image framework

Rosen

Popescu

2011

Vis Comput

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Multiperspective images (MPIs) show more than what is visible from a single viewpoint and are a promising approach for alleviating the problem of occlusions. We present a comprehensive user study that investigates the effectiveness of MPIs for 3-D scene exploration. A total of 47 subjects performed searching, counting, and spatial orientation tasks using both conventional and multiperspective images. We use a flexible MPI framework that allows trading off disocclusion power for image simplicity. The framework also allows rendering MPI images at interactive rates, which enables investigating interactive navigation and dynamic 3-D scenes. The results of our experiments show that MPIs can greatly outperform conventional images. For searching, subjects performed on average 28% faster using an MPI. For counting, accuracy was on average 91% using MPIs as compared to 42% for conventional images.

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“…In (Böttger et al 2008), a metro plan, i.e., a schematic, topological route representation, is used to transform a topographic map accordingly with image warping techniques, revealing the spatial relations between the metro stations. For short routes within a 3D VE, (Degener et al 2008) present an image warping technique to create a single image describing the way. Focus + context visualization as in (Trapp et al 2008) is another way to support wayfinding along routes in 3D VEs.…”

Section: Comparison With Existing Workmentioning

confidence: 99%

3D Wayfinding Choremes: A Cognitively Motivated Representation of Route Junctions in Virtual Environments

Glander

Peters

Trapp

et al. 2009

Advances in GIScience

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Research in cognitive sciences suggests that orientation and navigation along routes can be improved if the graphical representation is aligned with the user's mental concepts of a route. In this paper, we analyze an existing 2D schematization approach called wayfinding choremes and present an implementation for virtual 3D urban models, transferring the approach to 3D. To create the virtual environment, we transform the junctions of a route defined for a given road network to comply with the eight sector model, that is, outgoing legs of a junction are slightly rotated to align with prototypical directions in 45° increments. Then, the adapted road network is decomposed into polygonal block cells, the individual polygons are extruded to blocks and their façades are textured. For the evaluation of our 3D wayfinding choreme implementation, we present an EARLY DRAFT experiment framework that allows to train and test subjects by route learning tasks. The experiment framework can be parameterized flexibly, exposing parameters to the conductor. We finally give a sketch of a user study by identifying hypotheses, indicators, and, hence, experiments to be done.

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Effective Visualization of Short Routes

Cited by 11 publications

References 24 publications

Occlusion-Free Visualization of Important Geographic Features in 3D Urban Environments

Occlusion-Free Visualization of Important Geographic Features in 3D Urban Environments

An evaluation of 3-D scene exploration using a multiperspective image framework

3D Wayfinding Choremes: A Cognitively Motivated Representation of Route Junctions in Virtual Environments

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