Adaptive multi-resolution labeling in virtual landscapes

Chen, Chen; Zhang, Liqiang; Ma, Jie; Zhang, Kang; Liu, Liu; Xue, Xiaojuan

doi:10.1080/13658810903473205

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…[27]. In the field of GIS, viewshed analysis has been proven to be the most popular methodology and an important function for quantifying visibility [27][28][29], and its application is now commonly practiced in a range of fields, including road planning [30] and terrain exploration [31,32]. We will use the viewshed analysis tool to build the encounter model.…”

Section: Line-of-sight Topographic Visual Analysismentioning

confidence: 99%

Probabilistic Model of Random Encounter in Obstacle Space

Yin

Hui

Zhang³

et al. 2019

IJGI

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Based on probabilistic time-geography, the encounter between two moving objects is random. The quantitative analysis of the probability of encounter needs to consider the actual geographical environment. The existing encounter probability algorithm is based on homogeneous space, ignoring the wide range of obstacles and their impact on encounter events. Based on this, this paper introduces obstacle factors, proposes encounter events that are constrained by obstacles, and constructs a model of the probability of encounters of moving objects based on the influence of obstacles on visual perception with the line-of-sight view analysis principle. In realistic obstacle space, this method provides a quantitative basis for predicting the encountering possibility of two mobile objects and the largest possible encounter location. Finally, the validity of the model is verified by experimental results. The model uses part of the Wuhan digital elevation model (DEM) data to calculate the encounter probability of two moving objects on it, and analyzes the temporal and spatial distribution characteristics of these probabilities.

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Section: Line-of-sight Topographic Visual Analysismentioning

confidence: 99%

Probabilistic Model of Random Encounter in Obstacle Space

Yin

Hui

Zhang³

et al. 2019

IJGI

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“…Point symbols on a 2D map can be simply drawn as icons on the screen on top of other map elements. Cluttering can be avoided by detecting overlapping areas of icons and text elements and by applying intelligent label placement algorithms (Chen et al, 2010). This could be done in a similar fashion in a mixed 3D/2D system, which renders symbols in a second pass using screen painting functions.…”

Section: Encoding 3d Symbols In X3dmentioning

confidence: 99%

Scene Graph Based Approach for Interoperable Virtual Globes

Schilling

2012

International Journal of 3-D Information Modeling

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In this paper, a concept for developing and setting up virtual globes is discussed, which is based on principles of interoperable 3D spatial data infrastructures. Open geospatial industry standards for data and web services are merged with computer graphics technology to create a global coherent framework for accessing and displaying 3D assets. The author discusses how the scene graph concept can be used in a Geoweb environment. The Web 3D Service (W3DS) interface is used for streaming data in a distributed web architecture. Using scene graph data structures for encoding, transmitting, and displaying city- and landscape models imposes new requirements to geospatial analysis. The support of transformations between coordinate reference systems is essential in this context. Scene graph transformations are described in detail including matrix calculations. X3D is discussed as potential exchange format. Experiments were conducted using freely available data of OpenStreetMap and SRTM.

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“…Terrain visibility analysis is an important function in geographic information systems (GIS) [1]. It has been widely applied in the site selection of watch towers, wireless and television signal stations to ensure the greatest coverage from the signals of the facilities.…”

Section: Introductionmentioning

confidence: 99%

An improved line-of-sight method for visibility analysis in 3D complex landscapes

Liu

Zhang

Ma³

et al. 2010

Sci. China Inf. Sci.

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This paper presents an efficient method for implementing visibility analysis on complex landscapes based on an improved LOS (line of sight) algorithm. The method determines the viewshed by analyzing the geometric relationship between the target points and viewpoint. It differentiates the visibility of the target points by the elevation information. Eventually the visual results related to the given viewpoint are rendered on three-dimensional landscapes. The visibility of some target points is computed by comparing their elevations with the viewpoint's height, thus is able to enhance the efficiency of the visibility analysis. This method can not only be applied in the visibility analysis of forest scenes, but also used in the analysis of the urban environment. Experiments show that the proposed method results in high efficiency and precision.

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Adaptive multi-resolution labeling in virtual landscapes

Cited by 6 publications

References 12 publications

Probabilistic Model of Random Encounter in Obstacle Space

Probabilistic Model of Random Encounter in Obstacle Space

Scene Graph Based Approach for Interoperable Virtual Globes

An improved line-of-sight method for visibility analysis in 3D complex landscapes

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