The Impact of Level of Detail in 3d City Models for CFD-Based Wind Flow Simulations

García‐Sánchez, Clara; Vitalis, Stelios; Pađen, Ivan; Stoter, J.E.

doi:10.5194/isprs-archives-xlvi-4-w4-2021-67-2021

Cited by 10 publications

(8 citation statements)

References 7 publications

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“…At the same time, Coors et al [15] attempt to specify the application-specific requirements for 3D urban models and distinguish between those that are simulatable and those that are just for visualization purposes. The study results show no one-size-fits-all approach to LoD and geometry attributes, the same as García-Sánchez et al [16]. They indicate that the oversimplification of 3D city model geometries can affect the results of computational fluid dynamics (CFD) for wind flows.…”

Section: Methods For Efficient Workflows In 3d Building Reconstructionsupporting

confidence: 55%

“…However, there is no one-size-fits-all approach to LoD and geometry attributes. García-Sánchez et al's work highlights that the oversimplification of 3D city model geometries affects CFD results for wind flows, emphasizing the need for higher LoDs and semantics [16]. Singla et al and Coors et al's work provide cost-effective approaches to generate 3D city models and specify application-specific requirements for 3D urban models, respectively [15,20].…”

Section: Methods For Efficient Workflows In 3d Building Reconstructionmentioning

confidence: 99%

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Towards Urban Digital Twins: A Workflow for Procedural Visualization Using Geospatial Data

Somanath,

Naserentin,

Eleftheriou

et al. 2024

Remote Sensing

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A key feature for urban digital twins (DTs) is an automatically generated detailed 3D representation of the built and unbuilt environment from aerial imagery, footprints, LiDAR, or a fusion of these. Such 3D models have applications in architecture, civil engineering, urban planning, construction, real estate, Geographical Information Systems (GIS), and many other areas. While the visualization of large-scale data in conjunction with the generated 3D models is often a recurring and resource-intensive task, an automated workflow is complex, requiring many steps to achieve a high-quality visualization. Methods for building reconstruction approaches have come a long way, from previously manual approaches to semi-automatic or automatic approaches. This paper aims to complement existing methods of 3D building generation. First, we present a literature review covering different options for procedural context generation and visualization methods, focusing on workflows and data pipelines. Next, we present a semi-automated workflow that extends the building reconstruction pipeline to include procedural context generation using Python and Unreal Engine. Finally, we propose a workflow for integrating various types of large-scale urban analysis data for visualization. We conclude with a series of challenges faced in achieving such pipelines and the limitations of the current approach. However, the steps for a complete, end-to-end solution involve further developing robust systems for building detection, rooftop recognition, and geometry generation and importing and visualizing data in the same 3D environment, highlighting a need for further research and development in this field.

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Section: Methods For Efficient Workflows In 3d Building Reconstructionsupporting

confidence: 55%

Section: Methods For Efficient Workflows In 3d Building Reconstructionmentioning

confidence: 99%

Towards Urban Digital Twins: A Workflow for Procedural Visualization Using Geospatial Data

Somanath,

Naserentin,

Eleftheriou

et al. 2024

Remote Sensing

View full text Add to dashboard Cite

show abstract

“…For each test case, the same meteorological conditions are used: the wind blows in the 𝑌 -axis with an inflow velocity of 4.97 m s −1 at 10 m above the ground, and this is consistent with local measurements in Rotterdam already used to study the impact of building LoD on CFD predictions García-Sánchez et al (2021). The flow is considered incompressible and the atmospheric boundary layer (ABL) stratification is assumed to be neutral.…”

Section: Isolated Treementioning

confidence: 99%

“…The classification is introduced in Section 2.1. And while the effect of building LoDs on wind flow has been examined in the past (García-Sánchez et al, 2021;Ricci et al, 2017), this kind of exploratory investigation for trees has yet to be conducted, to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 99%

Should We Care About the Level of Detail in Trees When Running Urban Microscale Simulations?

Pađen

García‐Sánchez

2023

Preprint

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“…3D city models are useful in a number of applications, such as solar potential estimation and CFD simulations García-Sánchez et al, 2021). However, different applications need different geometric detail, which is why the concept of Level of Detail (LoD) has been early adopted in 3D city models.…”

Section: Introductionmentioning

confidence: 99%

Applying Versioning to Multi-Lod 3d City Models

Vitalis

Ohori

Stoter

2022

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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Abstract. Level of Detail (LoD) is a well known concept in 3D city models, used to designate different geometric detail that can be used in different applications. Nevertheless, multi-LoD datasets are hard to maintain and manage because of their intrinsic complexity. Versioning is a solution that aids in the storage and management of big and complex dataset, with its main goal being to facilitate the tracking of changes and collaboration. In this paper, we investigate the effects of utilising versioning and, more specifically, the concept of branches as a way to manage the evolution of multi-LoD datasets. We propose a framework according to which every LoD is stored in its own branch and can be extracted and updated independently. We tested this framework on a tile from 3D BAG, a dataset of 3D buildings for the whole of the Netherlands containing four LoDs (namely, LoD0, LoD1.2, LoD1.3 and LoD2.2). Our results suggest that there are certain benefits from this solution, such as the efficient tracking of changes for individual LoDs and the ability to extract and update the model using one LoD at a time. Nevertheless, there is a lot of complexity added to the process as a set of rules needs to be enforced when managing the model.

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The Impact of Level of Detail in 3d City Models for CFD-Based Wind Flow Simulations

Cited by 10 publications

References 7 publications

Towards Urban Digital Twins: A Workflow for Procedural Visualization Using Geospatial Data

Towards Urban Digital Twins: A Workflow for Procedural Visualization Using Geospatial Data

Should We Care About the Level of Detail in Trees When Running Urban Microscale Simulations?

Applying Versioning to Multi-Lod 3d City Models

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