scholarly journals GEOSPATIAL DATA PROCESSING FOR 3D CITY MODEL GENERATION, MANAGEMENT AND VISUALIZATION

2017 ◽  
Vol XLII-1/W1 ◽  
pp. 527-534 ◽  
Author(s):  
I. Toschi ◽  
E. Nocerino ◽  
F. Remondino ◽  
A. Revolti ◽  
G. Soria ◽  
...  
Keyword(s):  
Spatial Information ◽  
Database Management System ◽  
Web Based ◽  
Levels Of Detail ◽  
3D City Model ◽  
Building Models ◽  
3D Data ◽  
Project Smart ◽  
Recent Developments ◽  
City Model

Recent developments of 3D technologies and tools have increased availability and relevance of 3D data (from 3D points to complete city models) in the geospatial and geo-information domains. Nevertheless, the potential of 3D data is still underexploited and mainly confined to visualization purposes. Therefore, the major challenge today is to create automatic procedures that make best use of available technologies and data for the benefits and needs of public administrations (PA) and national mapping agencies (NMA) involved in “smart city” applications. The paper aims to demonstrate a step forward in this process by presenting the results of the SENECA project (Smart and SustaiNablE City from Above – <a href="http://seneca.fbk.eu"target="_blank">http://seneca.fbk.eu</a>). State-of-the-art processing solutions are investigated in order to (i) efficiently exploit the photogrammetric workflow (aerial triangulation and dense image matching), (ii) derive topologically and geometrically accurate 3D geo-objects (i.e. building models) at various levels of detail and (iii) link geometries with non-spatial information within a 3D geo-database management system accessible via web-based client. The developed methodology is tested on two case studies, i.e. the cities of Trento (Italy) and Graz (Austria). Both spatial (i.e. nadir and oblique imagery) and non-spatial (i.e. cadastral information and building energy consumptions) data are collected and used as input for the project workflow, starting from 3D geometry capture and modelling in urban scenarios to geometry enrichment and management within a dedicated webGIS platform.

scholarly journals INVESTIGATING THE ENRICHMENT OF A 3D CITY MODEL WITH VARIOUS CITYGML MODULES

2016 ◽  
Vol XLII-2/W2 ◽  
pp. 3-9 ◽  
Author(s):  
G. Floros ◽  
E. Dimopoulou
Keyword(s):  
Urban Areas ◽  
Data Conversion ◽  
Future Research ◽  
3D City Model ◽  
3D Data ◽  
City Modeling ◽  
Recent Developments ◽  
City Model ◽  
3D Acquisition ◽  
Conversion Tool

Recent developments in the massive 3D acquisition area made possible the generation of dense and precise 3D data, ranging from the representation of a simple building to a whole city. Nowadays, increasing urbanization, rapid growth of urban areas, and subsequently development of mega cities, are among the most important changes occurring worldwide. Therefore, developing techniques to manage these cities seems quite necessary. The aim of this paper is to investigate the enrichment of a 3D City Model with additional attributes, via appropriate CityGML Modules. The paper focuses on addressing the challenging issues that derive from a complex virtual 3D city modeling. More specifically, the paper investigates a complex built-up area, presenting and analyzing its constituting structures. Within this framework, the following CityGML modules are investigated: Bridge, Transportation Complex, CityFurniture, Land Use and Vegetation. To this purpose, the BIM-Standard software Trimble SketchUp and the data conversion tool FME are used. The processes of both modeling and converting are analyzed in detail. General conclusions and future research considerations are presented.

scholarly journals 3D MODELLING AND VISUALIZATION BASED ON THE UNITY GAME ENGINE – ADVANTAGES AND CHALLENGES

2017 ◽  
Vol IV-4/W4 ◽  
pp. 161-166 ◽  
Author(s):  
I. Buyuksalih ◽  
S. Bayburt ◽  
G. Buyuksalih ◽  
A. P. Baskaraca ◽  
H. Karim ◽  
...  
Keyword(s):  
3D Modelling ◽  
Database Integration ◽  
Game Engine ◽  
Implementation Phase ◽  
Research Areas ◽  
3D City Model ◽  
3D Data ◽  
Version 2.0 ◽  
City Model ◽  
Analysis Platform

3D City modelling is increasingly popular and becoming valuable tools in managing big cities. Urban and energy planning, landscape, noise-sewage modelling, underground mapping and navigation are among the applications/fields which really depend on 3D modelling for their effectiveness operations. Several research areas and implementation projects had been carried out to provide the most reliable 3D data format for sharing and functionalities as well as visualization platform and analysis. For instance, BIMTAS company has recently completed a project to estimate potential solar energy on 3D buildings for the whole Istanbul and now focussing on 3D utility underground mapping for a pilot case study. The research and implementation standard on 3D City Model domain (3D data sharing and visualization schema) is based on CityGML schema version 2.0. However, there are some limitations and issues in implementation phase for large dataset. Most of the limitations were due to the visualization, database integration and analysis platform (Unity3D game engine) as highlighted in this paper.

Scalable Multi-Platform Distribution of Spatial 3D Contents

2014 ◽  
Vol 3 (3) ◽  
pp. 35-49 ◽  
Author(s):  
Jan Klimke ◽  
Benjamin Hagedorn ◽  
Jürgen Döllner
Keyword(s):  
3D Visualization ◽  
High Quality ◽  
Efficient Manner ◽  
Web Based ◽  
3D City Models ◽  
3D Rendering ◽  
3D City Model ◽  
City Model ◽  
Rendering Techniques ◽  
City Models

Virtual 3D city models provide powerful user interfaces for communication of 2D and 3D geoinformation. Providing high quality visualization of massive 3D geoinformation in a scalable, fast, and cost efficient manner is still a challenging task. Especially for mobile and web-based system environments, software and hardware configurations of target systems differ significantly. This makes it hard to provide fast, visually appealing renderings of 3D data throughout a variety of platforms and devices. Current mobile or web-based solutions for 3D visualization usually require raw 3D scene data such as triangle meshes together with textures delivered from server to client, what makes them strongly limited in terms of size and complexity of the models they can handle. This paper introduces a new approach for provisioning of massive, virtual 3D city models on different platforms namely web browsers, smartphones or tablets, by means of an interactive map assembled from artificial oblique image tiles. The key concept is to synthesize such images of a virtual 3D city model by a 3D rendering service in a preprocessing step. This service encapsulates model handling and 3D rendering techniques for high quality visualization of massive 3D models. By generating image tiles using this service, the 3D rendering process is shifted from the client side, which provides major advantages: (a) The complexity of the 3D city model data is decoupled from data transfer complexity (b) the implementation of client applications is simplified significantly as 3D rendering is encapsulated on server side (c) 3D city models can be easily deployed for and used by a large number of concurrent users, leading to a high degree of scalability of the overall approach. All core 3D rendering techniques are performed on a dedicated 3D rendering server, and thin-client applications can be compactly implemented for various devices and platforms.

3D Modeling of Building Based on CSG and SketchUp

2012 ◽  
Vol 594-597 ◽  
pp. 2333-2337
Author(s):  
Yan Bing Wang ◽  
Mei Xia Zheng ◽  
Xiao Juan Li
Keyword(s):  
3D Modeling ◽  
Construction Management ◽  
Building Model ◽  
3D City Model ◽  
Building Models ◽  
Building Modeling ◽  
Traditional Algorithm ◽  
City Model ◽  
Combined Algorithm ◽  
Important Significance

3D modeling of city has become a hot research topic in the field of GIS, it has very important significance in terms of urban construction, management and planning. Building model is an important sector of 3D city model, after analyzing the traditional algorithm of building modeling, a combined algorithm based on CSG and SketchUp is proposed in this paper. Using CSG model, the regular buildings are constructed firstly, then using SketchUp software, the irregular buildings are constructed. Finally, all building models are combined into a continuous building. The paper uses parts of the actual data to verify the feasibility of this modeling approach in the paper.

scholarly journals Public Participation Using 3D Web-Based City Models: Opportunities for E-participation in Kisumu, Kenya

2018 ◽  
Author(s):  
Jacob Ragot Onyimbi ◽  
Mila Koeva ◽  
Johannes Flacke
Keyword(s):  
Public Participation ◽  
3D Visualization ◽  
Web Based ◽  
Professional Groups ◽  
3D City Model ◽  
Planning Project ◽  
Combined Use ◽  
Technical Details ◽  
City Model ◽  
User Friendly

Public participation is significant for the success of any urban planning project. However, most members of the general public are not planning professionals and may not understand the technical details of a 2D paper-based plan, which might hamper their participation. One way to expand the participation of citizens is to present plans in well-designed, user-friendly and interactive platforms that allow participation regardless of the technical skills of the participants. This paper investigates the impacts of the combined use of 3D visualization and E-participation on public participation in Kisumu, Kenya. A 3D City model, created with CityEngine2016, was exported into a web-based geo-portal and used as a Planning Support System in two stakeholder workshops in order to evaluate its usability. For e-participation, 300 questionnaires given out to planning practitioners. Five indicators were developed for evaluating the usability of the 3D model while the usability of e-participation was evaluated using communication, collaboration and learning as indicators. Results showed that effectiveness and efficiency varies within different professional groups while the questionnaires showed strong preference for e-participation methods, especially SMSs/USSDs and emails. The study concludes that the use of 3D visualization and E-participation has the potential for improving the quality and quantity of public participation and recommends further research on the subject.

scholarly journals QUALITY ANALYSIS ON 3D BUIDLING MODELS RECONSTRUCTED FROM UAV IMAGERY

2016 ◽  
Vol XLI-B1 ◽  
pp. 1121-1126 ◽  
Author(s):  
M. Jarzabek-Rychard ◽  
M. Karpina
Keyword(s):  
Laser Scanning ◽  
Information Source ◽  
Optimal Solution ◽  
Ground Truth ◽  
Quality Analysis ◽  
Reconstruction Process ◽  
Building Models ◽  
3D Data ◽  
Recent Developments ◽  
Height Component

Recent developments in UAV technology and structure from motion techniques have effected that UAVs are becoming standard platforms for 3D data collection. Because of their flexibility and ability to reach inaccessible urban parts, drones appear as optimal solution for urban applications. Building reconstruction from the data collected with UAV has the important potential to reduce labour cost for fast update of already reconstructed 3D cities. However, especially for updating of existing scenes derived from different sensors (e.g. airborne laser scanning), a proper quality assessment is necessary. The objective of this paper is thus to evaluate the potential of UAV imagery as an information source for automatic 3D building modeling at LOD2. The investigation process is conducted threefold: (1) comparing generated SfM point cloud to ALS data; (2) computing internal consistency measures of the reconstruction process; (3) analysing the deviation of Check Points identified on building roofs and measured with a tacheometer. In order to gain deep insight in the modeling performance, various quality indicators are computed and analysed. The assessment performed according to the ground truth shows that the building models acquired with UAV-photogrammetry have the accuracy of less than 18 cm for the plannimetric position and about 15 cm for the height component.

scholarly journals Modelling Buildings in CityGML LOD1: Building Parts, Terrain Intersection Curve and Address Features

2021 ◽  
Author(s):  
Evgeny Shirinyan ◽  
Dessislava Petrova-Antonova
Keyword(s):  
Multiple Sources ◽  
Intersection Curve ◽  
3D City Models ◽  
Building Model ◽  
3D City Model ◽  
Building Models ◽  
City Model ◽  
Open Datasets ◽  
Multiple Domains ◽  
City Models

3D city models integrate heterogeneous urban data from multiple sources in a unified geospatial representation, combining both semantics and geometry. Although in the last decades, they are predominantly used for visualization, today they are used in a large range of tasks related to exploration, analysis, and management across multiple domains. The complexity of urban processes and the diversity of urban environment bring challenges to the implementation of 3D city models. To address such challenges, this paper presents the development process of a 3D city model of a single neighborhood in Sofia city based on CityGML 2.0 standard. The model represents the buildings in LOD1 with a focus on CityGML features of related to the buildings like building part, terrain intersection curve and address. Similar building models of 18 cities provided as open datasets are explored and compared in order to extract good modeling practices. As a result, workflows for generation of 3D building models in LOD1 are elaborated and improvements in the feature modeling are proposed. Two options of building model are examined: modeling of a building as a single solid and modeling of a building with separate building parts. Finally, the possibilities for visualization of the model in popular platforms such as ArcGIS Pro and Cesium Ion are explored.

scholarly journals STORING A 3D CITY MODEL, ITS LEVELS OF DETAIL AND THE CORRESPONDENCES BETWEEN OBJECTS AS A 4D COMBINATORIAL MAP

2015 ◽  
Vol II-2/W2 ◽  
pp. 1-8
Author(s):  
K. Arroyo Ohori ◽  
H. Ledoux ◽  
J. Stoter
Keyword(s):  
3D City Models ◽  
Levels Of Detail ◽  
3D City Model ◽  
Topological Relationships ◽  
Combinatorial Maps ◽  
City Model ◽  
Radical Solution ◽  
Implementation Stage ◽  
City Models

3D city models of the same region at multiple LODs are encumbered by the lack of links between corresponding objects across LODs. In practice, this causes inconsistency during updates and maintenance problems. A radical solution to this problem is to model the LOD of a model as a dimension in the geometric sense, such that a set of connected polyhedra at a series of LODs is modelled as a single polychoron—the 4D analogue of a polyhedron. This approach is generally used only conceptually and then discarded at the implementation stage, losing many of its potential advantages in the process. This paper therefore shows that this approach can be instead directly realised using 4D combinatorial maps, making it possible to store all topological relationships between objects.

scholarly journals Modeling a 3D City Model and Its Levels of Detail as a True 4D Model

2015 ◽  
Vol 4 (3) ◽  
pp. 1055-1075 ◽  
Author(s):  
Ken Ohori ◽  
Hugo Ledoux ◽  
Filip Biljecki ◽  
Jantien Stoter
Keyword(s):  
Levels Of Detail ◽  
3D City Model ◽  
City Model
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