An efficient terrain Level of Detail implementation for mobile devices and performance study

Suárez, José P.; Trujillo, Agustín; Santana, J.J.; Calle, Manuel de la; Gómez-Deck, Diego

doi:10.1016/j.compenvurbsys.2015.02.004

Cited by 16 publications

(14 citation statements)

References 15 publications

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“…MultiVis has been implemented using the Glob3 Mobile (G3M) framework (Santana et al [35]). This SDK, presented in Suarez et al [47], is a mobile-oriented framework for the development of map and 3D globe applications, being highly configurable in terms of user navigation and level of detail (LoD) strategies. Thus, the framework is suitable for the present research, having recently demonstrated several possibilities that mobile devices offer for the planning of complex infrastructures and working with large datasets.…”

Section: Implementation Of the Multivis Mobile Applicationmentioning

confidence: 99%

Making the Invisible Visible—Strategies for Visualizing Underground Infrastructures in Immersive Environments

Ortega

Wendel

Santana

et al. 2019

IJGI

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Visualization of underground infrastructure in an interactive 3D immersive environment is extremely important for efficient management of city’s infrastructure. This paper describes different geometric modelling approaches to illustrate appropriate visualization of such data. A multimodal prototype has been developed by exploiting different algorithms to render these invisible underground objects as part of an urban model. This prototype has been integrated in an immersive geographic information system (GIS), named MultiVis, for handheld iOS and Android devices. As a part of the study, three distinct strategies have been tested; the first is based on the use of transparencies to convey a sense of depth, the second relies on an image-space superposition of “ditches” on top of the rendered frame and the third is a world-space deformation of the elevation model that exposes the underground elements. Furthermore, a comparative user experience analysis of different techniques aimed to the geometrically accurate visualisation of utility networks and other underground facilities are performed and evaluated. It includes a set of user evaluations for different parameters of these techniques, which gives us an insight on how the proposed methods affect the experience and usability for technical and non-technical users.

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Section: Implementation Of the Multivis Mobile Applicationmentioning

confidence: 99%

Making the Invisible Visible—Strategies for Visualizing Underground Infrastructures in Immersive Environments

Ortega

Wendel

Santana

et al. 2019

IJGI

Self Cite

View full text Add to dashboard Cite

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“…While the number of the primitives generally gives a good impression about the geometric complexity of a 3D city model, it cannot be considered as an unambiguous differentiator as it is the case in computer graphics. (The only exception to this in GIS and in 3D city modelling is terrain because of its usually triangular representation: lower LOD means less triangles (De Berg and Dobrindt, 1998;Suárez et al, 2015). )…”

Section: Shortcomings Of the Current Concept And Difficulties With Dementioning

confidence: 99%

An improved LOD specification for 3D building models

Biljecki

Ledoux

Stoter

2016

Computers, Environment and Urban Systems

336

176

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The level of detail (LOD) concept of the OGC standard CityGML 2.0 is intended to differentiate multi-scale representations of semantic 3D city models. The concept is in practice principally used to indicate the geometric detail of a model, primarily of buildings. Despite the popularity and the general acceptance of this categorisation, we argue in this paper that from a geometric point of view the five LODs are insufficient and that their specification is ambiguous.We solve these shortcomings with a better definition of LODs and their refinement. Hereby we present a refined set of 16 LODs focused on the grade of the exterior geometry of buildings, which provide a stricter specification and allow less modelling freedom. This series is a result of an exhaustive research into currently available 3D city models, production workflows, and capabilities of acquisition techniques. Our specification also includes two hybrid models that reflect common acquisition practices. The new LODs are in line with the LODs of CityGML 2.0, and are intended to supplement, rather than replace the geometric part of the current specification. While in our paper we focus on the geometric aspect of the models, our specification is compatible with different levels of semantic granularity. Furthermore, the improved LODs can be considered format-agnostic.Among other benefits, the refined specification could be useful for companies for a better definition of their product portfolios, and for researchers to specify data requirements when presenting use cases of 3D city models. We support our refined LODs with experiments, proving their uniqueness by showing that each yields a different result in a 3D spatial operation.Keywords: Level of detail; 3D city modelling; 3D GIS; 3D building models; CityGML; Scale Highlights• CityGML LODs are an industry standard for conveying the grade of 3D city models.• The 5 LODs are not defined precisely, and they are not sufficient for this purpose.• We present a refined series of 16 LODs that overcomes these issues.

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“…(Suárez et al, 2015) presents a globe application, where the use of a quadtree enables constant resource usage. However, this only works for regularly meshed tiles, where each tile has the same number of triangles.…”

Section: State Of the Artmentioning

confidence: 99%

Data Structure for Progressive Visualisation and Edition Of Vectorial Geospatial Data

Gaillard

Peytavie

Gesquière

2016

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:3D mock-ups of cities are becoming an increasingly common tool for urban planning. Sharing the mock-up is still a challenge since the volume of data is so high. Furthermore, the recent surge in low-end, mobile devices requires developers to carefully control the amount of data they process. In this paper, we present a hierarchical data structure that allows the streaming of vectorial data. Loosely based on a quadtree, the structure stores the data in tiles and is organised following a weight function which allows the most relevant data to be displayed first. The relevance of a feature can be measured by its geometry and semantic attributes, and can vary depending on the application or client type. Tiles can be limited in size (number of features or triangles) for the client to be able to control resource consumption. The article also presents algorithms for the addition or removal of features in the data structure, opening the path for the interactive edition of city data stored in a database.

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An efficient terrain Level of Detail implementation for mobile devices and performance study

Cited by 16 publications

References 15 publications

Making the Invisible Visible—Strategies for Visualizing Underground Infrastructures in Immersive Environments

Making the Invisible Visible—Strategies for Visualizing Underground Infrastructures in Immersive Environments

An improved LOD specification for 3D building models

Data Structure for Progressive Visualisation and Edition Of Vectorial Geospatial Data

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