Method for 3D City Building Continuous Transformation Based on an Improved LOD Topological Data Structure

Li, Siyi; Li, Wenjing; Zhang, Lin; Yi, Shengjie

doi:10.3390/ijgi8110504

Cited by 7 publications

(5 citation statements)

References 19 publications

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“…For urban energy analysis, however, open data models do not generally include the geometric detailing required to represent individual buildings in their respective geographical contexts. As previously mentioned in Section 3, studies such as [115][116][117][118], do allow transforming CityGML building models; however, these are primarily limited to downscaling higher LoD models to lower ones. Moreover, the algorithms are mostly available with a restricted access.…”

Section: Discussionmentioning

confidence: 99%

“…They classify building surfaces as interior or exterior and also include an additional LoD called LoD3.5. Other techniques proposed by Li et al [117] and Sun et al [118] also allow the transformation of different LoDs, but these are generally limited to downscaling higher LoDs to lower ones. Moreover, most of the previously mentioned techniques are not available as open source nor updated in recent years.…”

Section: Aim Of Researchmentioning

confidence: 99%

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Open-Source Tool for Transforming CityGML Levels of Detail

et al. 2021

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Urban Building Energy Modelling (UBEM) requires adequate geometrical information to represent buildings in a 3D digital form. However, open data models usually lack essential information, such as building geometries, due to a lower granularity in available data. For heating demand simulations, this scarcity impacts the energy predictions and, thereby, questioning existing simulation workflows. In this paper, the authors present an open-source CityGML LoD Transformation (CityLDT) tool for upscaling or downscaling geometries of 3D spatial CityGML building models. With the current support of LoD0–2, this paper presents the adapted methodology and developed algorithms for transformations. Using the presented tool, the authors transform open CityGML datasets and conduct heating demand simulations in Modelica to validate the geometric processing of transformed building models.

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Section: Discussionmentioning

confidence: 99%

Section: Aim Of Researchmentioning

confidence: 99%

Open-Source Tool for Transforming CityGML Levels of Detail

et al. 2021

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“…Nevertheless, GIS itself is much worse than CAD and 3DMax in 3D data modeling and visualization. Therefore, many scholars have constructed a 3D landscape model of the entire city by combining the advantages of these two systems and planned to use this model to manage the 3D information of the entire city, which was the beginning of the exploration of the 3D city model (3DCM) [108][109][110]. Using the methods of aerial stereo image pairs and object extraction technology, the semiautomatic measurement of 3D data of aerial image houses is realized, and then the visible surface texture of buildings is restored on the basis of the ground and building surface two-dimensional semi-irregular triangulation network and original digital image, and the 3D urban landscape is reconstructed.…”

Section: D Modeling For Fine Managementmentioning

confidence: 99%

Impact of Digital Twins and Metaverse on Cities: History, Current Situation, and Application Perspectives

Shang

Guizani

2022

Applied Sciences

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To promote the expansion and adoption of Digital Twins (DTs) in Smart Cities (SCs), a detailed review of the impact of DTs and digitalization on cities is made to assess the progression of cities and standardization of their management mode. Combined with the technical elements of DTs, the coupling effect of DTs technology and urban construction and the internal logic of DTs technology embedded in urban construction are discussed. Relevant literature covering the full range of DTs technologies and their applications is collected, evaluated, and collated, relevant studies are concatenated, and relevant accepted conclusions are summarized by modules. First, the historical process and construction content of a Digital City (DC) under modern demand are analyzed, and the main ideas of a DC design and construction are discussed in combination with the key technology of DTs. Then, the metaverse is the product of the combination of various technologies in different scenes. It is a key component to promote the integration of the real world and the digital world and can provide more advanced technical support in the construction of the DC. DTs urban technology architecture is composed of an infrastructure terminal information center terminal and application server end. Urban intelligent management is realized through physical urban data collection, transmission, processing, and digital urban visualization. The construction of DTs urban platform can improve the city’s perception and decision-making ability and bring a broader vision for future planning and progression. The interactive experience of the virtual world covered by the metaverse can effectively support and promote the integration of the virtual and real, and will also greatly promote the construction of SCs. In summary, this work is of important reference value for the overall development and practical adoption of DTs cities, which improves the overall operation efficiency and the governance level of cities.

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“…e point cloud data are then clustered, and the contour line is drawn by the cluster point cloud data. To achieve a single body from an oblique photography model, the cutting polygon is determined by the constructed building contour, the bounding box of the cutting polygon is intersected with bounding box of the first-level LOD [31] of the oblique photography model, and the intersecting models are extracted. e triangles of the intersecting model are divided into three parts, namely, inside, outside, and intersecting with the cutting polygon.…”

Section: Flowchartmentioning

confidence: 99%

A New Method of Achieving Single Three-Dimensional Building Model Automatically Based on Oblique Photography Data

Che

Liu

et al. 2021

Mathematical Problems in Engineering

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Operating and managing single three-dimensional building model individually are critical in the application of oblique photography models. However, these models are usually complete and continuous, and the single three-dimensional building model in these models cannot be managed individually. Generally, achieving a single three-dimensional building model requires a human-computer interaction to determine the cutting range, but this process is time-consuming and inefficient. To overcome this problem, this study proposed a new method for automatically achieving single three-dimensional building model without the need for human-computer interaction. First, the point clouds of an oblique photography model are divided into virtual grids, and the point clouds in each virtual grid are seen as a whole. In this way, the number of point clouds involved in the calculation is reduced, thereby improving computing efficiency. Second, the point clouds of a building facade are extracted by setting the height difference. By comparing the height difference between the highest point and the lowest point of the grid with height difference threshold, all point clouds in the grid that do not meet the requirements are eliminated. Third, the point clouds of the building facade are classified, and the contour line is extracted by the classified point clouds. Finally, the single three-dimensional building model is achieved by reconstructing the triangles that intersect with the extracted contour line. Experimental results show that the proposed method can effectively achieve single bodies automatically from an oblique photography building model. This method is then useful for achieving single three-dimensional building model from massive oblique photography data.

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Method for 3D City Building Continuous Transformation Based on an Improved LOD Topological Data Structure

Cited by 7 publications

References 19 publications

Open-Source Tool for Transforming CityGML Levels of Detail

Open-Source Tool for Transforming CityGML Levels of Detail

Impact of Digital Twins and Metaverse on Cities: History, Current Situation, and Application Perspectives

A New Method of Achieving Single Three-Dimensional Building Model Automatically Based on Oblique Photography Data

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