A variational approach for automatic generation of panoramic maps

Degener, Patrick; Klein, Reinhard

doi:10.1145/1477926.1477928

Cited by 21 publications

(9 citation statements)

References 19 publications

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“…However, the large distortions of the resulting zigzagging and twisted routes often caused misleading navigation for users. Later Degener and Klein [14] presented a variational approach to generate panoramic maps in mountain areas. This approach can provide a good overview and it avoids the occlusion of important geographical features; however, it also requires considerable computation.…”

Section: Visualization Of Foimentioning

confidence: 99%

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%

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

Zhang¹,

Zhang²,

Xu³

2016

IJGI

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“…Alternatively, elevation information can be represented by applying projections that deviate from the traditional, orthographic top-down views-such as perspective, cylindrical, or oblique projections [12]. Mapmakers may also create views that distort the underlying map to emphasize specific terrain features [6,13]. The panorama maps often used to show ski slopes are a common example of this technique.…”

Section: Relief Rendering Techniquesmentioning

confidence: 99%

Lightweight Relief Shearing for Enhanced Terrain Perception on Interactive Maps

Willett

Jenny

Isenberg

et al. 2015

Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems

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International audienceWe explore interactive relief shearing, a set of non-intrusive, direct manipulation interactions that expose depth and shape information in terrain maps using ephemeral animations. Reading and interpreting topography and relief on terrain maps is an important aspect of map use, but extracting depth information from 2D maps is notoriously difficult. Modern mapping software attempts to alleviate this limitation by presenting digital terrain using 3D views. However, 3D views introduce occlusion, complicate distance estimations, and typically require more complex interactions. In contrast, our approach reveals depth information via shearing animations on 2D maps, and can be paired with existing interactions such as pan and zoom. We examine explicit, integrated, and hybrid interactions for triggering relief shearing and present a version that uses device tilt to control depth effects. Our evaluation shows that these interactive techniques improve depth perception when compared to standard 2D and perspective views

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“…This work has been followed by an approach by Möser et al [15], where they distorted the terrain surface to be aligned with the predefined base surface to reduce possible occlusions of geographic features. Degener and Klein [6] constructed a variational formulation for automating occlusion-free representation of ski and hiking courses in mountain areas. Cui et al [5] implemented GPUaccelerated techniques for occlusion-free visualization and demonstrated real-time navigation in canyon terrain areas.…”

Section: Related Workmentioning

confidence: 99%

Constrained optimization for disoccluding geographic landmarks in 3D urban maps

Hirono

Takahashi

2013

2013 IEEE Pacific Visualization Symposium (PacificVis)

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Figure 1: Side-by-side comparison between an ordinary perspective view (left) and its optimally distorted version with our approach (right). Note that we can successfully avoid the occlusions of important route to the destination (drawn in orange) while accentuating the 3D appearance of the landmark buildings. ( ABSTRACTIn composing hand-drawn 3D urban maps, the most common design problem is to avoid overlaps between geographic features such as roads and buildings by displacing them consistently over the map domain. Nonetheless, automating this map design process is still a challenging task because we have to maximally retain the 3D depth perception inherent in pairs of parallel lines embedded in the original layout of such geographic features. This paper presents a novel approach to disoccluding important geographic features when creating 3D urban maps for enhancing their visual readability. This is accomplished by formulating the design criteria as a constrained optimization problem based on the linear programming approach. Our mathematical formulation allows us to systematically eliminate occlusions of landmark roads and buildings, and further controls the degree of local 3D map deformation by devising an objective function to be minimized. Various design examples together with a user study are presented to demonstrate the robustness and feasibility of the proposed approach.

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A variational approach for automatic generation of panoramic maps

Cited by 21 publications

References 19 publications

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

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

Lightweight Relief Shearing for Enhanced Terrain Perception on Interactive Maps

Constrained optimization for disoccluding geographic landmarks in 3D urban maps

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