Hasil untuk "Urbanization. City and country"

Rui Liu, Steven Jige Quan, Zhong-Ren Peng et al.

As cities evolve over time, challenges such as traffic congestion and functional imbalance increasingly necessitate urban renewal through efficient modification of existing plans, rather than complete re-planning. In practice, even minor urban changes require substantial manual effort to redraw geospatial layouts, slowing the iterative planning and decision-making procedure. Motivated by recent advances in agentic systems and multimodal reasoning, we formulate urban renewal as a machine-executable task that iteratively modifies existing urban plans represented in structured geospatial formats. More specifically, we represent urban layouts using GeoJSON and decompose natural-language editing instructions into hierarchical geometric intents spanning polygon-, line-, and point-level operations. To coordinate interdependent edits across spatial elements and abstraction levels, we propose a hierarchical agentic framework that jointly performs multi-level planning and execution with explicit propagation of intermediate spatial constraints. We further introduce an iterative execution-validation mechanism that mitigates error accumulation and enforces global spatial consistency during multi-step editing. Extensive experiments across diverse urban editing scenarios demonstrate significant improvements in efficiency, robustness, correctness, and spatial validity over existing baselines.

Luís M. A. Bettencourt, Ivanna Rodriguez, Jordan T. Kemp et al.

Cities are characterized by the coexistence of general aggregate patterns, along with many local variations. This poses challenges for analyses of urban phenomena, which tend to be either too aggregated or too local, depending on the disciplinary approach. Here, we use methods from statistical learning theory to develop a general methodology for quantifying how much information is encoded in the spatial structure of cities at different scales. We illustrate the approach via the multiscale analysis of income distributions in over 900 US metropolitan areas. By treating the formation of diverse neighborhood structures as a process of spatial selection, we quantify the complexity of explanation needed to account for personal income heterogeneity observed across all US urban areas and each of their neighborhoods. We find that spatial selection is strongly dependent on income levels with richer and poorer households appearing spatially more segregated than middle-income groups. We also find that different neighborhoods present different degrees of income specificity and inequality, motivating analysis and theory beyond averages. Our findings emphasize the importance of multiscalar statistical methods that both coarse-grain and fine-grain data to bridge local to global theories of cities and other complex systems.

J. Santillan, C. Heipke

Urbanization, a global phenomenon with profound implications for sustainable development, is a focal point of Sustainable Development Goal 11 (SDG 11). Aimed at fostering inclusive, resilient, and sustainable urbanization by 2030, SDG 11 emphasizes the importance of monitoring land use efficiency (LUE) through indicator 11.3.1. In the Philippines, urbanization has surged over recent decades. Despite its importance, research on urbanization and LUE has predominantly focused on the country’s national capital region (Metro Manila), while little to no attention is given to comprehensive investigations across different regions, provinces, cities, and municipalities of the country. Additionally, challenges in acquiring consistent spatial data, especially due to the Philippines’ archipelagic nature, have hindered comprehensive analysis. To address these gaps, this study conducts a thorough examination of urbanization patterns and LUE dynamics in the Philippines from 1975 to 2020, leveraging Global Human Settlement Layers (GHSL) data and secondary indicators associated with SDG 11.3.1. Our study examines spatial patterns and temporal trends in built-up area expansion, population growth, and LUE characteristics at both city and municipal levels. Among the major findings are the substantial growth in built-up areas and population across the country. We also found a shift in urban growth dynamics, with Metro Manila showing limited expansion in recent years while new urban growth emerges in other regions of the country. Our analysis of the spatiotemporal patterns of Land Consumption Rate (LCR) revealed three distinct evolutional phases: a growth phase between 1975–1990, followed by a decline phase between 1990–2005, and a resurgence phase from 2005–2020. Generally declining trends in LCR and Population Growth Rate (PGR) were evident, demonstrating the country’s direction towards efficient built-up land utilization. However, this efficiency coincides with overcrowding issues as revealed by additional indicators such as the Abstract Achieved Population Density in Expansion Areas (AAPDEA) and Marginal Land Consumption per New Inhabitant (MLCNI). We also analyzed the spatial patterns and temporal trends of LUE across the country and found distinct clusters of transitioning urban centers, densely inhabited metropolises, expanding metropolitan regions, and rapidly growing urban hubs. The study’s findings suggest the need for policy interventions that promote compact and sustainable urban development, equitable regional development, and measures to address overcrowding in urban areas. By aligning policies with the observed spatial and temporal trends, decision-makers can work towards achieving SDG 11, fostering inclusive, resilient, and sustainable urbanization in the Philippines.

Ibrahim MASUD, Mohammad Muslem UDDIN, Rupak LOODH

This study aimed at delineating the shoreline by using the Digital Shoreline Analysis System (DSAS 5.0) tool and detected the changes of land use/land cover (LULC) by Google Earth Engine (GEE) platform. The shoreline is divided into two zones, whereas Zone I covered 87.12[Formula: see text]km and Zone II possessed 168.05[Formula: see text]km. According to End Point Rate (EPR), the mean shoreline change rate of Zone I is 3.55[Formula: see text]m/year and Zone II is [Formula: see text]6.84[Formula: see text]m/year. Likewise, based on Linear Regression Rate (LRR), the mean shoreline change rate of Zone I is 5.46[Formula: see text]m/year and Zone II is [Formula: see text]4.71[Formula: see text]m/year, respectively. Apart from that, the Net Shoreline Movement (NSM) recorded in Zone I is 109.42[Formula: see text]m as well as Zone II is [Formula: see text]213.25[Formula: see text]m, which also revealed how much the shoreline has changed during the last 32 years. This study also used the Kalman filter model to forecast the shoreline positions for 20 years. The most destructive signal is that more than 70% of the coastline is vulnerable due to erosion, whereas 6% is highly vulnerable. By contrast, the results of LULC changes demonstrated the increasing trend of water bodies, built up, and agricultural land while vegetation along with bare land is reduced continuously. The overall accuracy is recorded above 88%, and the kappa co-efficient is found above 0.87 for all three years. The outcome of this study will provide fruitful insight into coastal land use management and adaptation measures against the ongoing along with future threats of shoreline changes to coastal ecosystems and livelihoods.

Federico Camerin, Lucas Álvarez-Del-Valle, Ana Díez-Bermejo et al.

The paper provides an analysis of the difference in the tools adopted in the Spanish urban policies between the two last EU programming cycles (2014–2020 and 2021–2027). After an introduction with references to the policy framework and the literature, a methodological section describes the focus of the research, the source of the data and how this information has been used for the comparative purpose of the work. The following section (Results) provides the comparison of the contents of the policy documents delivered by the Spanish cities involved in the urban agenda, with reference to the type of actions selected, the overlapping of thematic and strategic focus through the two periods, the budget allocated, etc. In the conclusive sections the attempt is to highlights analogies and differences between the two policy periods, pointing out the future investigation needed to provide a more comprehensive outlook on the question addressed in the paper.

A. Aguilar, M.A.A. Flores, L. F. Lara

There is a great deal of concern over the scattered, fragmented expansion of cities, particularly in developing countries. This expansion accelerates the peri-urbanization processes expressed in a range of land uses, often with a concentration of the poor in peripheries with an acute shortage of services coupled with profound land-use changes, with far-reaching environmental impacts. The urban periphery is a transition zone, where the urban gradually merges into the rural landscape. It has become heterogeneous from a social, environmental, commercial, and service point of view, reproducing a model of metropolitan inequity with marked socioeconomic inequalities between the center and the periphery. The way these territories are managed is quite far from the road to sustainability. This article seeks to provide an updated analysis of the dynamics of urban expansion and land-use changes on the southern periphery of Mexico City (CDMX) in the Conservation Area (CA), to determine the extent to which a socially segregated, environmentally unsustainable model of urban fragmentation has been reinforced. It also discusses the regulatory, normative framework established in the CA, finding that it has been deficient and implemented in piecemeal fashion. It concludes that local government has failed to provide solutions to reconcile the protection of ecological conservation areas with the needs of the poor in a peri-urban area, thereby reproducing social inequalities in the city. In addition, CDMX land use policy has been ineffective in controlling the expansion of informal human settlements in peri-urban areas with high ecological value.

Xinke Huang, Yuqin Jiang, Ali Mostafavi

Understanding the relationship between spatial structures of cities and environmental hazard exposures (such as urban heat) is essential for urban health and sustainability planning. However, a critical knowledge gap exists in terms of the extent to which socio-spatial networks shaped by human mobility exacerbate or alleviate urban heat exposures of populations in cities. In this study, we utilize location-based data to construct human mobility networks in twenty metropolitan areas in the U.S. The human mobility networks are analyzed in conjunction with the urban heat characteristics of spatial areas. We identify areas with high and low urban heat exposure and evaluate visitation patterns of populations residing in high and low urban heat areas to other spatial areas with similar and dissimilar urban heat exposure. The results reveal the presence of urban heat traps in the majority of the studied metropolitan areas in which populations residing in high heat exposure areas primarily visit areas with high heat exposure. The results also show a small percentage of human mobility to produce urban heat escalate (visitations from low heat areas to high heat areas) and heat escapes (movements from high heat areas to low heat areas). The findings from this study provide a better understanding of urban heat exposure in cities based on patterns of human mobility. These finding contribute to a broader understanding of the intersection of human network dynamics and environmental hazard exposures in cities to inform more integrated urban design and planning to promote health and sustainability.

Kaiwen Song, Xiaoyi Zeng, Chenqu Ren et al.

Existing neural radiance field-based methods can achieve real-time rendering of small scenes on the web platform. However, extending these methods to large-scale scenes still poses significant challenges due to limited resources in computation, memory, and bandwidth. In this paper, we propose City-on-Web, the first method for real-time rendering of large-scale scenes on the web. We propose a block-based volume rendering method to guarantee 3D consistency and correct occlusion between blocks, and introduce a Level-of-Detail strategy combined with dynamic loading/unloading of resources to significantly reduce memory demands. Our system achieves real-time rendering of large-scale scenes at approximately 32FPS with RTX 3060 GPU on the web and maintains rendering quality comparable to the current state-of-the-art novel view synthesis methods.

Sangchul Park

Cities are becoming smarter and more resilient by integrating urban infrastructure with information technology. However, concerns grow that smart cities might reverse progress on civil liberties when sensing, profiling, and predicting citizen activities; undermining citizen autonomy in connectivity, mobility, and energy consumption; and deprivatizing digital infrastructure. In response, cities need to deploy technical breakthroughs, such as privacy-enhancing technologies, cohort modelling, and fair and explainable machine learning. However, as throwing technologies at cities cannot always address civil liberty concerns, cities must ensure transparency and foster citizen participation to win public trust about the way resilience and liberties are balanced.

Fahad Matar, Falli Palaiologou, Simon Richards

Despite the growing literature on sustainability assessment in the urban context, the resulting approaches and methods utilise several differing theoretical frameworks and lack a unifying vision and modus operandi. Innumerable tools and instruments have been developed for particular purposes and rather narrow goals. Curiously, these tools and instruments remain unable to trace and assess sustainability in vernacular forms and traditional built environments, even though environments such as these demonstrably possess sustainable principles beside their aesthetic values and spatial qualities.This paper reviews the theoretical background underpinning the current sustainability assessment methods in the urban context to identify their general limitations and their specific applicability to vernacular and traditional built environments. Also, this paper discusses some of the cultural and spatial qualities of traditional built form to identify its embedded sustainable strategies and practices. The paper concludes with an outline conceptual framework intended to develop general sustainability principles for traditional built forms in response to their natural and cultural contexts.A literature review of the concepts of sustainability assessment in the urban context and embedded sustainable principles in vernacular and traditional built form is followed by a thematic analysis of its limitations, which feeds into this conceptualisation of a new, principle-based framework. A total of 10 principles of sustainability are proposed to assess sustainability in traditional built environments, taking into account the variation of locality and site-specific context.

Anton Brokow-Loga, Timmo Krüger

This paper addresses the scope for action by municipalities in a climate emergency and places it in the framework of ecomodern (urban) policy. We analyse the way in which two German ‘climate emergency municipalities’ translate conflicts of post-fossil transformation into concrete political and planning strategies. Although more than 2,200 authorities around the world have already declared a climate emergency, research on the impact of these resolutions on the political orientation of municipalities is very limited. Our research focus is on the (potentially agonistic) treatment of conflicts in planning. We argue that in times of a socio-ecological crisis, success in conflict resolution cannot refer to appeasement and depoliticisation. Instead, we propose a framework of five criteria, based on critical theory on ecomodern strategies, planning processes and degrowth. Thus, this practice-related and explorative paper connects empirical insights from the German cities of Constance and Berlin with an innovative normative framework. The findings tell a complex story of an, at least partial, admission of the failure of previous climate mitigation strategies, a lack of social institutions of limits, an instrumental relation to nature and a disregard for social injustices. The paper discusses how municipalities, in the context of ongoing tensions over the post-fossil transformation in Germany, on the one hand hold on to business-as-usual approaches, but on the other hand also set political impulses for change.

Sadeq Khaleefah Hanoon, Dr. Ahmad Fikri Abdullah, Dr. Helmi Z. M. Shafri et al.

Sustainable development on a global scale has been hindered by urbanization and water scarcity, but the greatest threat is from decision-makers ignoring these challenges, particularly in developing countries. In addition, urbanization is spreading at an alarming rate across the globe, affecting the environment and society in profound ways. This study reviews previous studies that examined future scenarios of urban areas under the challenges of rapid population growth, urban sprawl and water scarcity in order to improve supported decision-making (SDM). Scholars expected that the rapid development of the urbanization scenario would cause resource sustainability to continually be threatened as a result of excessive use of natural resources. In contrast, a sustainable development scenario is an ambitious plan that relies on optimal land use, which views land as a limited and non-renewable resource. In consequence, estimating these threats together could be crucial for planning sustainable strategies for the long term. In light of this review, the SDM tool could be improved by combining the cellular automata model, water evolution and planning model coupled with geographic information systems, remote sensing and Analytic Hierarchy Process (AHP) method. Urban planners could use the proposed tool to optimize, simulate and visualize the dynamic processes of land-use change and urban water to overcome critical conditions.

Yuetao Wu, Yi Zhang, Zexu Han et al.

Planning policies have greatly influenced the development of urban villages, an informal phenomenon in which rural settlements are encircled by urban environments during China’s rapid urbanization process. “The National New-type Urbanization Plan (2014–2020)” of China initiated in 2014 provides a new perspective on planning policy research on China’ urban villages. Hangzhou, a pioneer city that adopts new-type urbanization in China and combines the characteristics of rapid urban growth, mountainous urban terrains, and a long cultural history, serves as a typical case study to compare the planning policies responding to the informality of urban villages guided by traditional and new-type urbanization. This study employed the content analysis method to analyze the evolution of Hangzhou’s planning policies of urban villages since the reform and opening up and used one-way ANOVA to analyze the differences in rental levels among the urban villages developed under the planning policies of different urbanization stages, aiming to compare the influences of planning policies guided by traditional and new-type urbanization on urban village development. The results indicate that the policies allowing some degree of informality in the new-type urbanization stage achieve a higher rental level for urban villages than the policies of the traditional urbanization stages that restrict and prevent informality. The findings of this research suggest that informality may provide advantages that formality cannot replace and provides important policy implications for rapidly urbanizing countries.

M. Carlucci, Efstathios Grigoriadis, K. Rontos et al.

Amro M. Farid, Muhannad Alshareef, Parupkar Singh Badhesha et al.

At the turn of the 21st century, urban development has experienced a paradigm shift so that the quest for smarter cities has become a priority agenda, with the direct participation of industry, policymakers, practitioners, and the scientific community alike. The 2008 financial crisis, the exodus from rural areas, and the densification of urban centers coupled with environmental and sustainability concerns have posed enormous challenges to municipalities all over the globe. The United Nations predicts that the world population will reach 9.8 billion by 2050, a growth of 2.1 billion from the 2018 level. Almost all of this population growth will occur in urban areas and, consequently, stress already overloaded transportation systems.

Alessandro Venerandi, Luca Maria Aiello, Sergio Porta

The COVID-19 pandemic generated a considerable debate in relation to urban density. This is an old debate, originated in mid 19th century's England with the emergence of public health and urban planning disciplines. While popularly linked, evidence suggests that such relationship cannot be generally assumed. Furthermore, urban density has been investigated in a spatially coarse manner (predominantly at city level) and never contextualised with other descriptors of urban form. In this work, we explore COVID-19 and urban form in Greater London, relating a comprehensive set of morphometric descriptors (including built-up density) to COVID-19 deaths and cases, while controlling for socioeconomic, ethnicity, age, and co-morbidity. We describe urban form at individual building level and then aggregate information for official neighbourhoods, allowing for a detailed intra-urban representation. Results show that: i) control variables significantly explain more variance of both COVID-19 cases and deaths than the morphometric descriptors; ii) of what the latter can explain, built-up density is indeed the most associated, though inversely. The typical London neighbourhood with high levels of COVID-19 infections and deaths resembles a suburb, featuring a low-density urban fabric dotted by larger free-standing buildings and framed by a poorly inter-connected street network.

Najda Villefranque, Frédéric Hourdin, Louis d'Alençon et al.

Urban areas are a high-stake target of climate change mitigation and adaptation measures. To understand, predict and improve the energy performance of cities, the scientific community develops numerical models that describe how they interact with the atmosphere through heat and moisture exchanges at all scales. In this review, we present recent advances that are at the origin of last decade's revolution in computer graphics, and recent breakthroughs in statistical physics that extend well established path-integral formulations to non-linear coupled models. We argue that this rare conjunction of scientific advances in mathematics, physics, computer and engineering sciences opens promising avenues for urban climate modeling and illustrate this with coupled heat transfer simulations in complex urban geometries under complex atmospheric conditions. We highlight the potential of these approaches beyond urban climate modeling, for the necessary appropriation of the issues at the heart of the energy transition by societies.

Federica Gaglione, David Ania Ayiine Etigo

Starting from the relationship between urban planning and mobility management, TeMA has gradually expanded the view of the covered topics, always following a rigorous scientific in-depth analysis. This section of the Journal, Review Notes, is a continuous update about emerging topics concerning relationships among urban planning, mobility, and environment, thanks to a collection of short scientific papers written by young researchers. The Review Notes are made up of five parts. Each section examines a specific aspect of the broader information storage within the main interests of the TeMA Journal. In particular: the Town Planning International Rules and Legislation. Section aims at presenting the latest updates in the territorial and urban legislative sphere. The theme of energy and its related energy consumption is a leading theme in the European scientific debate for the continuous pursuit of urban development. In this direction, the contribution of this review notes illustrates on the one hand optimization models and decision support tools produced so far to improve the energy organization at different urban scales and on the other highlights within the cards, strategies and actions carried out forward from the European Union to have a cognitive and operational framework on energy planning and on how to accelerate the sustainability of urban systems.

Thomas Elmqvist, Christopher Raymond, Timon McPhearson

Zhaogui Yan, Mingjun Teng, Wei He et al.

Urban biodiversity has increasingly been recognized by the scientific community and environmental policymakers as a part of conservation efforts worldwide. However, most studies on urban biodiversity focus on cities in developed countries. An information gap exists for urban biodiversity of cities in developing countries. Here we focused on variability in plant diversity, a major component of biodiversity, in a Chinese city that has undergone rapid urbanization in recent time. The influence of urbanization was determined by comparing plant diversity and proportion of exotic/endemic plant species with the intensity of urbanization across the study area. We used percentage of total impervious surface area (PTIA) as an indicator of urbanization intensity, ranging from 5% to 95% across the study area. In the study area, a total of 321 plant species was recorded, totaling 83 trees, 113 shrubs and 125 herbs. Plant diversity, measured by number of plant taxa and other indices, was driven by PTIA; an increase in PTIA reduced plant diversity. In addition, the ratio of exotic to endemic plant species increased as PTIA increased. Among the exotic species, most of the tree and shrub species were purposely introduced. Above 40% PTIA, plant diversity decreased sharply and the proportion of exotic species rose. As a valuable predictor of urban biodiversity, PTIA can thus be used as a key criterion for urban planning to ameliorate urban biodiversity. Further, our findings extend current understanding of urban biodiversity for cities in developing countries.