期刊文献+
共找到36篇文章
< 1 2 >
每页显示 20 50 100
A Preliminary Review on Three-Dimensional City Model 被引量:2
1
作者 ZHOU Qiming Department of Geography ,Hong Kong Baptist University,KowloonTong HongKong. ZHANG Wenjiang 《Geo-Spatial Information Science》 2004年第2期79-88,共10页
In this paper a review on current research on 3DCM is presented, and an alternative approach by integrating the concepts and techniques of object\|oriented method and Computer Aided Design (CAD) is suggested. Through ... In this paper a review on current research on 3DCM is presented, and an alternative approach by integrating the concepts and techniques of object\|oriented method and Computer Aided Design (CAD) is suggested. Through the approach urban spatial entities as objects are extracted, which are represented with primary 3D elements (node, edge, face and body) and their combinations. In the light of the concept of object, the method supports the multiple representation of Level of Details (LOD). More importantly, topological relationships between objects are described so that 3D topological operations can be implemented. 展开更多
关键词 spatial data model urban GIS 3D city model object-oriented GIS
下载PDF
Balance of Datum Land Prices Among Cities Based on the City Gravitation Model and Stochastic Diffusion Equation 被引量:2
2
作者 LIU Yaolin LIU Yang +1 位作者 LAN Zeying XIAYin LIU Wei 《Geo-Spatial Information Science》 2008年第1期71-78,共8页
A balance of urban datum land prices is achieved to harmonize regional land prices and make the prices truly reflect different economic development levels and land prices among cities. The current piecewise linear int... A balance of urban datum land prices is achieved to harmonize regional land prices and make the prices truly reflect different economic development levels and land prices among cities. The current piecewise linear interpolation balance method widely used has two drawbacks that always lead to an unsatisfactory balance among some cities. When the excess of land price in the central city to the surrounding zone reaches a certain degree, land price in the circumjacent city is not only consistent with the local land grade and land use level, but also influenced by the diffusion of land price in the central city. Thus, a new balanced scheme of datum land prices based on the city gravitation model and stochastic diffusion equation is brought forward. Finally, the new method is examined in the practice of datum land price balance in Hubei Province, China. 展开更多
关键词 datum land price balance city gravitation model stochastic diffusion equation
下载PDF
Impact of Accessibility on Housing Prices in Dalian City of China Based on a Geographically Weighted Regression Model 被引量:13
3
作者 YANG Jun BAO Yajun +2 位作者 ZHANG Yuqing LI Xueming GE Quansheng 《Chinese Geographical Science》 SCIE CSCD 2018年第3期505-515,共11页
This paper studies the relationship between accessibility and housing prices in Dalian by using an improved geographically weighted regression model and house prices, traffic, remote sensing images, etc. Multi-source ... This paper studies the relationship between accessibility and housing prices in Dalian by using an improved geographically weighted regression model and house prices, traffic, remote sensing images, etc. Multi-source data improves the accuracy of the spatial differentiation that reflects the impact of traffic accessibility on house prices. The results are as follows: first, the average house price is 12 436 yuan(RMB)/m^2, and reveals a declining trend from coastal areas to inland areas. The exception was Guilin Street, which demonstrates a local peak of house prices that decreases from the center of the street to its periphery. Second, the accessibility value is 33 minutes on average, excluding northern and eastern fringe areas, which was over 50 minutes. Third, the significant spatial correlation coefficient between accessibility and house prices is 0.423, and the coefficient increases in the southeastern direction. The strongest impact of accessibility on house prices is in the southeastern coast, and can be seen in the Lehua, Yingke, and Hushan communities, while the weakest impact is in the northwestern fringe, and can be seen in the Yingchengzi, Xixiaomo, and Daheishi community areas. 展开更多
关键词 geographically weighted regression model accessibility house price Dalian city
下载PDF
Carbon Emission of Regional Land Use and Its Decomposition Analysis: Case Study of Nanjing City, China 被引量:11
4
作者 ZHAO Rongqin HUANG Xianjin +3 位作者 LIU Ying ZHONG Taiyang DING Minglei CHUAI Xiaowei 《Chinese Geographical Science》 SCIE CSCD 2015年第2期198-212,共15页
Through the matching relationship between land use types and carbon emission items, this paper estimated carbon emissions of different land use types in Nanjing City, China and analyzed the influencing factors of carb... Through the matching relationship between land use types and carbon emission items, this paper estimated carbon emissions of different land use types in Nanjing City, China and analyzed the influencing factors of carbon emissions by Logarithmic Mean Divisia Index(LMDI) model. The main conclusions are as follows: 1) Total anthropogenic carbon emission of Nanjing increased from 1.22928 ×10^7 t in 2000 to 3.06939 × 10^7 t in 2009, in which the carbon emission of Inhabitation, mining & manufacturing land accounted for 93% of the total. 2) The average land use carbon emission intensity of Nanjing in 2009 was 46.63 t/ha, in which carbon emission intensity of Inhabitation, mining & manufacturing land was the highest(200.52 t/ha), which was much higher than that of other land use types. 3) The average carbon source intensity in Nanjing was 16 times of the average carbon sink intensity(2.83 t/ha) in 2009, indicating that Nanjing was confronted with serious carbon deficit and huge carbon cycle pressure. 4) Land use area per unit GDP was an inhibitory factor for the increase of carbon emissions, while the other factors were all contributing factors. 5) Carbon emission effect evaluation should be introduced into land use activities to formulate low-carbon land use strategies in regional development. 展开更多
关键词 carbon emission land use intensity Logarithmic Mean Divisia Index(LMDI) model decomposition analysis Nanjing city
下载PDF
Empirical Research on Carrying Capacity of Human Settlement System in Dalian City, Liaoning Province, China 被引量:12
5
作者 ZHENG Defeng ZHANG Yu +1 位作者 ZANG Zheng SUN Caizhi 《Chinese Geographical Science》 SCIE CSCD 2015年第2期237-249,共13页
Using the theories of population carrying capacity and ecological elasticity in other fields for reference, the connotation of regional human settlement system was defined from the viewpoint of the complex relationshi... Using the theories of population carrying capacity and ecological elasticity in other fields for reference, the connotation of regional human settlement system was defined from the viewpoint of the complex relationship among the factors such as regional population, resources, environment and economic and social development in the context of China′s rapid urbanization. Then the concept and characterization methods of the regional human settlement carrying capacity were proposed by means of population scale. Furthermore, a model of carrying capacity-pressure-state-response(CPSR) on regional human settlement system was established by referencing pressure-state-response(PSR) model, and the Catastrophe Theory was introduced to determine the corresponding standards of multi-criteria programming and evaluation. Taking Dalian City, Liaoning Province, China as an example, an empirical analysis on evaluation of human settlement system from 2000 to 2012 was carried out. The results showed that the carrying capacity of human settlement system in Dalian was fluctuating between 9.6 × 106 to 10 × 106 persons with a quantitative stage of the dynamic regulation. During the research period the load index of human settlement system in Dalian dropped from 0.96 to 0.84 with a lower pressure of human settlement system than the national average level. And the emergency response grades of human settlement system in Dalian were kept in grade Ⅱ(orange warning) or grade Ⅲ(yellow warning). Human settlement system of Dalian was in slight security state as a whole, but the load had a tendency of increase in recent years. The related departments should pay close attention to regional human settlement system and take active measures to improve human settlement by both intensity control and total quantity control. By comparison, analysis and discussion, it was considered that the results were basically accordded with the current situations of human settlement in Dalian, and the evaluation results were more reliable, visualized and easily applied in practice. Therefore, the above-mentioned concepts, characterization and evaluation methods of the regional human settlement system and carrying capacity could provide a new thought and method for quantitative evaluation of human settlement. 展开更多
关键词 human settlement capacity-pressure-state-response(CPSR) model carrying capacity multi-objective decision making Dalian city China
下载PDF
Unified Data Model of Urban Air Pollution Dispersion and 3D Spatial City Model:Groundwork Assessment towards Sustainable Urban Development for Malaysia 被引量:2
6
作者 Uznir Ujang Francois Anton Alias Abdul Rahman 《Journal of Environmental Protection》 2013年第7期701-712,共12页
Understanding the behavior of urban air pollution is important en route for sustainable urban development (SUD). Malaysia is on its mission to be a developed country by year 2020 comprehends dealing with air pollution... Understanding the behavior of urban air pollution is important en route for sustainable urban development (SUD). Malaysia is on its mission to be a developed country by year 2020 comprehends dealing with air pollution is one of the indicators headed towards it. At present monitoring and managing air pollution in urban areas encompasses sophisticated air quality modeling and data acquisition. However, rapid developments in major cities cause difficulties in acquiring the city geometries. The existing method in acquiring city geometries data via ground or space measurement inspection such as field survey, photogrammetry, laser scanning, remote sensing or using architectural plans appears not to be practical because of its cost and efforts. Moreover, air monitoring stations deployed are intended for regional to global scale model whereby it is not accurate for urban areas with typical resolution of less than 2 km. Furthermore in urban areas, the pollutant dispersion movements are trapped between buildings initiating it to move vertically causing visualization complications which imply the limitations of existing visualization scheme that is based on two-dimensional (2D) framework. Therefore this paper aims is to perform groundwork assessment and discuss on the current scenario in Malaysia in the aspect of current policies towards SUD, air quality monitoring stations, scale model and detail discussion on air pollution dispersion model used called the Operational Street Pollution Model (OSPM). This research proposed the implementation of three-dimensional (3D) spatial city model as a new physical data input for OSPM. The five Level of Details (LOD) of 3D spatial city model shows the scale applicability for the dispersion model implementtation. Subsequently 3D spatial city model data commonly available on the web, by having a unified data model shows the advantages in easy data acquisition, 3D visualization of air pollution dispersion and improves visual analysis of air quality monitoring in urban areas. 展开更多
关键词 3D Spatial city Model Urban Air Dispersion Model Unified Data Model Sustainable Urban Development cityGML 3D Visualization 3D GIS
下载PDF
Procedural modeling applied to the 3D city model of Bogota:A case study 被引量:1
7
作者 Gustavo ALOMÍA Diego LOAIZA +2 位作者 Claudia ZÙÑIGA Xun LUO Rafael ASOREYCACHEDA 《Virtual Reality & Intelligent Hardware》 2021年第5期423-433,共11页
Background Computer Generated Animations(CGA),when applied to three-dimensional(3D)city models(3DCM),can be used as powerful tools to support urban decision-making.This leads to a new paradigm,based on procedural mode... Background Computer Generated Animations(CGA),when applied to three-dimensional(3D)city models(3DCM),can be used as powerful tools to support urban decision-making.This leads to a new paradigm,based on procedural modeling,that allows the integration of known urban structures.Methods This paper introduces a new workflow for the development of high-quality approximations of urban models in a short time and enables facilities to be imported from other cities into a given city model,following specific generation rules.Results Thus,this workflow provides a very simple approach to observe,study,and simulate the implementation of models already developed in other cities,in a city where they are not yet adopted.Examples of these models include all types of mobility systems and urban infrastructure.Conclusions This allows us to perceive the environmental impact of certain decisions in the real world,as well as to carry out simple simulations to determine the changes that can occur in the flows of people,traffic,and other city activities. 展开更多
关键词 Computer Generated Animations Geographical information system Urban planning 3D city Modeling
下载PDF
Study on Visualization of Virtual City Model Based on Internet
8
作者 JINBaoxuan BIANFuling ZUOXiaoqing WANGFangxiong 《Geo-Spatial Information Science》 2005年第2期115-121,共7页
With the rapid development of computer graphics, distributed-computing and Internet, it is possible to achieve Internet-based virtual city. This paper dwells on the method of the terrain and its feature modeling and c... With the rapid development of computer graphics, distributed-computing and Internet, it is possible to achieve Internet-based virtual city. This paper dwells on the method of the terrain and its feature modeling and complex entity modeling in the virtual city. Then, discusses the method for Internet-based virtual city 3D visualization and the design of the Browser/Server architecture of the system of virtual city in the network environment. Finally, Java and Java 3D are used to show an experiment example, and the related conclusion about Internet-based virtual city 3D displaying and the client-side interactive operation is given. 展开更多
关键词 distributed-computing virtual city modeling 3D visualization Java 3D
下载PDF
Countermeasures for Solving the Environmental Problems and Accelerating the Model City Construction of Xi'an
9
作者 Liu Zhenxiang Song Ting Ma Longbao 《Meteorological and Environmental Research》 CAS 2014年第2期55-58,62,共5页
Through careful study, it found that the key and difficult points of affecting and restricting Xi'an to reach the model city construction standards in provincial and national levels were "urban air environment quali... Through careful study, it found that the key and difficult points of affecting and restricting Xi'an to reach the model city construction standards in provincial and national levels were "urban air environment quality standards" and "water qualification rate of urban water environment function area". In order to tackle with the weak links, highlight the important points and focus on the difficult points to strengthen scientific and technological innovation, we actively explored new ideas and ways to resolve the dilemma in meeting the two standards of model city construction, and we managed to put forward the countermeasures to resolve the dilemma through innovating system and mechanism. "Place master system" should be carded out quickly to meet the "urban air environment quality standards", while "river master system" should be implemented as soon as possible to reach the "water qualification rate of urban water environment function area". The aim of this study was to enhance the qualification rates of the indicators for model city construction to make Xi'an successfully pass the provincial and national assessment of model city construction through dealing with the weak links to accelerate the realization of becoming model environmental protection city. 展开更多
关键词 Model environmental protection city construction COUNTERMEASURES Environmental problems China
下载PDF
An Automated Process of Creating 3D City Model for Monitoring Urban Infrastructures
10
作者 Mirko Borisov Vladimir Radulović +2 位作者 Zoran Ilić Vladimir MPetrović Nenad Rakićević 《Journal of Geographical Research》 2022年第2期1-10,共10页
This paper describes the process of designing models and tools for an automated way of creating 3D city model based on a raw point cloud.Also,making and forming 3D models of buildings.Models and tools for creating too... This paper describes the process of designing models and tools for an automated way of creating 3D city model based on a raw point cloud.Also,making and forming 3D models of buildings.Models and tools for creating tools made in the model builder application within the ArcGIS Pro software.An unclassified point cloud obtained by the LiDAR system was used for the model input data.The point cloud,collected by the airborne laser scanning system(ALS),is classified into several classes:ground,high and low noise,and buildings.Based on the created DEMs,points classified as buildings and formed prints of buildings,realistic 3D city models were created.Created 3D models of cities can be used as a basis for monitoring the infrastructure of settlements and other analyzes that are important for further development and architecture of cities. 展开更多
关键词 3D city model INFRASTRUCTURE Automated processing Point cloud Model builder
下载PDF
Managing underground legal boundaries in 3D-extending the CityGML standard
11
作者 Bahram Saeidian Abbas Rajabifard +1 位作者 Behnam Atazadeh Mohsen Kalantari 《Underground Space》 SCIE EI 2024年第1期239-262,共24页
Legal boundaries are used for delineating the spatial extent of ownership property’s spaces.In underground environments,these boundaries are defined by referencing physical objects,surveying measurements,or projectio... Legal boundaries are used for delineating the spatial extent of ownership property’s spaces.In underground environments,these boundaries are defined by referencing physical objects,surveying measurements,or projections.However,there is a gap in connecting and managing these boundaries and underground legal spaces,due to a lack of data model.A 3D data model supporting underground land administration(ULA)should define and model these boundaries and the relationships between them and underground ownership spaces.Prominent 3D data models can be enriched to model underground legal boundaries.This research aims to propose a new taxonomy of underground legal boundaries and model them by extending CityGML,which is a widely used 3D data model in the geospatial science domain.We developed,implemented,and tested the model for different types of underground legal boundaries.The implemented prototype showcased the potential benefits of CityGML for managing underground legal boundaries in 3D.The proposed 3D underground model can be used to address current challenges associated with communicating and managing legal boundaries in underground environments.While this data model was specifically developed for Victoria,Australia,the proposed model and approach can be used and replicated in other jurisdictions by adjusting the data requirements for underground legal boundaries. 展开更多
关键词 Underground Legal boundaries Land administration 3D data model city model
原文传递
A Comparative Study on Pattern of Urban Forest Patch and Its Ecological Benefit Evaluation in the Park of Hefei Based on the GIS Technology 被引量:1
12
作者 张磊 李亚亮 《Agricultural Science & Technology》 CAS 2015年第9期2060-2063,共4页
Based on the GIS technology, CITYgreen computer model was used in this paper to estimate ecological benefits of urban forest in the park of Hefei city.It used this technology to make an analysis on urban forest ecolog... Based on the GIS technology, CITYgreen computer model was used in this paper to estimate ecological benefits of urban forest in the park of Hefei city.It used this technology to make an analysis on urban forest ecological benefits. The research discussed how to use the technology of CITYgreen model developed in USA to account urban forest benefits in China. The results showed that forests in Xiaoyao Jin Park occupied about 52.62% of park land area and Xinghua Park13.00% respectively, indicating that Xiaoyaojin Park is dominated by large trees such as arbors, and Xinghua Park dominated by laws, with low coverage. Besides,the comprehensive eco-benefits of Xiaoyaojin Park and Xinghua Park were 5.150 3and 1.354 3 million yuan and per unit area eco-benefits were 144 000 and 47 400yuan/hm^2, which indicated that Xiaoyaojin Park makes the greatest contribution in ecological benefits. 展开更多
关键词 GIS city green model Urban forest Ecological benefit
下载PDF
Analyzing Industrial Structure Evolution of Old Industrial Cities Using Evolutionary Resilience Theory:A Case Study in Shenyang of China 被引量:13
13
作者 GUAN Haoming LIU Wenxin +3 位作者 ZHANG Pingyu LO Kevin LI Jing LI Liangang 《Chinese Geographical Science》 SCIE CSCD 2018年第3期516-528,共13页
The recession and revitalization of old industrial cities concerns urban industrial evolution and its characteristics. Based on the theory of evolutionary resilience, we developed an analytical framework for the indus... The recession and revitalization of old industrial cities concerns urban industrial evolution and its characteristics. Based on the theory of evolutionary resilience, we developed an analytical framework for the industrial structure evolution of old industrial cities, and applied the framework to a case study in Shenyang. The following conclusions are drawn. First, since 1978, Shenyang's industrial growth capacity has shown fluctuation between ‘contraction-expansion'. As the secondary industry has a much stronger expansionary and contractionary capacity for growth, this results in lacking stability leading to industrial structure transformation. Second, since 1999, the orientation towards a high-end manufacturing industry in Shenyang has weakened, and the evolution of the new and old growth path is characterized by low-end orientation. Third, since 2007, Shenyang's industrial innovation output capacity has dropped sharply which has been significantly affected by scientific and technological personnel and enterprise-owed science and technology institutions and to a less extent by R&D expenditure. We applied the resilience theory to study the industrial evolution of an old industrial city, explored new study perspectives on industrial evolution and verified the applicability of the resilience theory. This paper provides a scientific reference for understanding the recent deceleration in economic growth in the Northeast old industrial base, and for exploring new paths toward revitalization. 展开更多
关键词 evolutionary resilience industrial evolution path economic cycle model old industrial city Shenyang
下载PDF
Two-and Three-Dimensional Urban Core Determinants of the Urban Heat Island: A Statistical Approach 被引量:1
14
作者 Bumseok Chun Jean-Michel Guldmann 《Journal of Environmental Science and Engineering(B)》 2012年第3期363-378,共16页
There is no doubt that the UHI (urban heat island) is a mounting problem in built-up environments, due to the energy retention by surface dense building materials, leading to increased temperatures, air pollution, a... There is no doubt that the UHI (urban heat island) is a mounting problem in built-up environments, due to the energy retention by surface dense building materials, leading to increased temperatures, air pollution, and energy consumption. Much of the earlier research on the UHI has used two-dimensional (2-D) information, such as land uses and the distribution of vegetation. In the case of homogeneous land uses, it is possible to predict surface temperatures with reasonable accuracy with 2-D information. However, three-dimensional (3-D) information is necessary to analyze more complex sites, including dense building clusters. In this research, 3-D building geometry information is combined with 2-D urban surface information to examine the relationship between urban characteristics and temperature. The research includes the following stages: (1) estimating urban temperature; (2) developing a 3-D city model; (3) generating geometric parameters; and (4) conducting statistical analyses using both linear and non-linear regression models. The implications of the results are discussed, providing guidelines for policies aiming to reduce the UHI. 展开更多
关键词 Urban heat island urban morphology three-dimensional city model geographic information system.
下载PDF
Distribution of primary school based on spatial network comprehensive model in low-income mountainous cities: a case study in Wanyuan, China 被引量:3
15
作者 YANG Pei-feng HE Ran HOU Hai-bo 《Journal of Mountain Science》 SCIE CSCD 2017年第10期2082-2096,共15页
Focusing on the peculiarities of urban construction resulting from specific mountain terrains, the purpose of this study is to find out a suitable method based on a Spatial Network Comprehensive Model(SNCM) to reasona... Focusing on the peculiarities of urban construction resulting from specific mountain terrains, the purpose of this study is to find out a suitable method based on a Spatial Network Comprehensive Model(SNCM) to reasonably plan and distribute primary schools in low-income mountain cities. The construction principles and advantages of the SNCM method are proposed and the method tested in Wanyuan city of Qinba Mountain area(Southwest China) to verify its feasibility and optimization. Taking account of the mountain terrain and its influence on user behavior, we used the SNCM method to build a comprehensive model which integrates the road slope and the walking speed of pupils into the basic spatial model. The model is used to calculate a reasonable layout of the primary schools and to validate the rationale. The results show that the SNCM method can be effectively applied in low-income mountainous cities. It can not only improve the accessibility and service efficiency of primary schools using as little capital-investment as possible, but also help the city grow in an intensive and efficient way. 展开更多
关键词 Spatial network comprehensive model Primary school distribution Mountainous terrain Low-income mountainous cities China
下载PDF
Deblurring Texture Extraction from Digital Aerial Image by Reforming “Steep Edge” Curve
16
作者 WUJun CHENDanqing 《Geo-Spatial Information Science》 2005年第1期39-44,共6页
Texture extract from digital aerial image is widely used in three-dimensional city modeling to generate “photo-realistic” views. In this paper, a method based on reforming “Steep edge” curve, which clearly explain... Texture extract from digital aerial image is widely used in three-dimensional city modeling to generate “photo-realistic” views. In this paper, a method based on reforming “Steep edge” curve, which clearly explains how the diffraction of the sunlight makes digital aerial image blurring, is proposed to deblur the texture extraction from digital aerial image, and the experiment shows a good result in visualization and automation. 展开更多
关键词 'steep edge' curve image deblurring city modeling
下载PDF
Artificiality and Naturalness:Semi-underground Houses and Their Role in the Construction of a Sustainable Urban Landscape
17
作者 Francesco Paolo R.Marino Filiberto Lembo 《Journal of Civil Engineering and Architecture》 2022年第7期331-343,共13页
The contemporary interest,on one hand for a renewed relationship between city and natural landscape,on the other for settlement typologies intrinsically efficient from an energy standpoint took back the attention on t... The contemporary interest,on one hand for a renewed relationship between city and natural landscape,on the other for settlement typologies intrinsically efficient from an energy standpoint took back the attention on the design of the dug city,or rather,almost completely excavated.This is an emblematic model of the requirement that deals with the factors of its environment,like sun,wind,ground,shadow and flora,forcing some designers to migrate from usual design methodologies,indifferent to these design parameters,and they are careful only to the“laws of form”,in search of criteria and fine calculation tools to optimize the configuration and the structure of buildings,in order to ensure that they can be managed as“passively”as possible.What it means,with the minimum contribution of plants to ensure the best satisfaction of comfort and psychological needs of users:not only lighting,sunbathing,ventilation,thermal comfort in summer and winter,acoustic comfort,but also view characteristics,quality of lighting and sociological aspects.In general dialectic between artifice and nature,the theme of dug architecture today is faced not only as one of the most interesting and rich suggestions,but also as one of those,in which the reflection on objectives,methodologies and tools is longer necessary,to the identification of a new way of urban living and effective solutions against energy consumption. 展开更多
关键词 Semi-underground typologies earth-sheltered houses thermal insulation choices design models for dug cities sustainable city planning
下载PDF
From Sequential to Parallel Growth of Cities: Theory and Evidence from Canada
18
作者 SHENG Kerong FAN Jie +1 位作者 SUN Wei MA Hailong 《Chinese Geographical Science》 SCIE CSCD 2016年第3期377-388,共12页
This paper examines city growth patterns and the corresponding city size distribution evolution over long periods of time using a simple New Economic Geography(NEG) model and urban population data from Canada. The mai... This paper examines city growth patterns and the corresponding city size distribution evolution over long periods of time using a simple New Economic Geography(NEG) model and urban population data from Canada. The main findings are twofold. First, there is a transition from sequential to parallel growth of cities over long periods of time: city growth shows a sequential mode in the stage of rapid urbanization, i.e., the cities with the best development conditions will take the lead in growth, after which the cities with higher ranks will become the fastest-growing cities; in the late stage of urbanization, city growth converges according to Gibrat′s law, and exhibits a parallel growth pattern. Second, city size distribution is found to have persistent structural characteristics: the city system is self-organized into multiple discrete size groups; city growth shows club convergence characteristics, and the cities with similar development conditions eventually converge to a similar size. The results will not only enhance our understanding of urbanization process, but will also provide a timely and clear policy reference for promoting the healthy urbanization of developing countries. 展开更多
关键词 sequential city growth Gibrta′s law finite mixture model convergence club Canada
下载PDF
City Digital Twins: their maturity level and differentiation from 3D city models
19
作者 Homa Masoumi Sara Shirowzhan +1 位作者 Paria Eskandarpour Christopher James Pettit 《Big Earth Data》 EI CSCD 2023年第1期1-36,共36页
The emerging field of City Digital Twins has advanced in recent years with the help of digital infrastructure and technologies connected to the Internet of Things(IoT).However,the evolution of this field has been so f... The emerging field of City Digital Twins has advanced in recent years with the help of digital infrastructure and technologies connected to the Internet of Things(IoT).However,the evolution of this field has been so fast that a gap has opened in relation to systematic reviews of the relevant literature and the maturation of City Digital Twins on an urban scale.Our work bridges this gap by highlighting maturity in the field.We conducted a systematic literature review with bibliometric and content analysis of 41 selected papers published in Web of Science and Scopus data-bases,covering five areas:data types and sources,case studies,applied technologies and methods,maturity spectrum,and appli-cations.Based on maturity indicators,the majority of the reviewed studies(90%)were at initial to medium stages of maturity(up to element 3),most of them focused on 3D modelling,monitoring and visualisation.However,digital twins cannot be limited to 3D models,monitoring and visualisation,for they can be developed to include two-directional interactions between humans and com-puters.Such a high level of maturity,which was not found in the reviewed studies,requires advanced technologies and methods such as cloud computing,artificial intelligence,BIM and GIS.We also found that further studies are essential if the field is to handle the complex urban challenges of multidisciplinary digital twins.While City Digital Twins extend by definition beyond mere 3D city modelling,some studies involving 3D city models still refer to their subjects as City Digital Twins.Among the research gaps we identified,we’d like to highlight the need for near-real-time data analytics algorithms,which could furnish City Digital Twins with big data insights.Other opportunities include public participation capabilities to increase social collaboration,integrating BIM and GIS technologies and improving storage and computation infrastructure. 展开更多
关键词 city Digital Twins big data IOT artificial intelligence city information modelling
原文传递
Semantic 3D City Agents- An intelligent automation for dynamic geospatial knowledge graphs 被引量:3
20
作者 Arkadiusz Chadzynski Shiying Li +5 位作者 Ayda Grisiute Feroz Farazi Casper Lindberg Sebastian Mosbach Pieter Herthogs Markus Kraft 《Energy and AI》 2022年第2期50-66,共17页
This paper presents a system of autonomous intelligent software agents,based on a cognitive architecture,capable of automated instantiation,visualisation and analysis of multifaceted City Information Models in dynamic... This paper presents a system of autonomous intelligent software agents,based on a cognitive architecture,capable of automated instantiation,visualisation and analysis of multifaceted City Information Models in dynamic geospatial knowledge graphs.Design of JPS Agent Framework and Routed Knowledge Graph Access components was required in order to provide backbone infrastructure for an intelligent agent system as well as technology agnostic knowledge graph access enabling automation of multi-domain data interoperability.Development of CityImportAgent,CityExportAgent and DistanceAgent showcased intelligent automation capa-bilities of the Cities Knowledge Graph.The agents successfully created a semantic model of Berlin in LOD 2,compliant with CityGML 2.0 standard and consisting of 419909661 triples described using OntoCityGML.The system of agents also visualised and analysed the model by autonomously tracking interactions with a web interface as well as enriched the model by adding new information to the knowledge graph.This way it was possible to design a geospatial information system able to meet demands imposed by the Industry 4.0 and link it with the other multi-domain knowledge representations of The World Avatar. 展开更多
关键词 Cognitive architecture Artificial intelligence Knowledge graph AUTOMATION city modelling GEOSPATIAL
原文传递
上一页 1 2 下一页 到第
使用帮助 返回顶部