scholarly journals Urban expansion and differential accessibility by car and public transport in the Greater Kumasi city-region, Ghana—A geospatial modelling approach

2022 ◽  
Vol 98 ◽  
pp. 103257
Author(s):  
Ransford A. Acheampong ◽  
Stephen Boahen Asabere
Keyword(s):  
Public Transport ◽  
Urban Expansion ◽  
City Region ◽  
Geospatial Modelling ◽  
Modelling Approach

scholarly journals Research on Planning and Model Design of Micro-cycle Bus Line Based on Metro Station Connection

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Qiushui Fang ◽  
Zhingming Li ◽  
Zhen Wang ◽  
Jincheng Wu ◽  
Hongling Yu ◽  
...  
Keyword(s):  
Public Transport ◽  
Public Transportation ◽  
Travel Demand ◽  
Urban Expansion ◽  
Optimal Solution ◽  
Walking Distance ◽  
Model Design ◽  
Metro Station ◽  
City Bus ◽  
The Cost

Public transport coverage fails to keep pace with urbanization and urban expansion, which makes the “last kilometer" problem of residents’ travel increasingly prominent”. However, the practice has proved that microcirculation public transportation plays an important role in expanding the coverage of public transportation and promoting the integration of public transportation. Therefore, this paper takes a city bus community as an example. Firstly, it analyses the bus travel demand of commuters connecting to the subway station during the early workday rush hours on basis of IC Big Data, obtains candidate stations of microcirculation bus lines through K-means clustering. Secondly, it establishes the model, the target of which is to minimize  the cost residents' travel and bus operation, under the limited condition of walking distance, passenger number, station spacing and departure frequency. Finally, the genetic algorithm is used to find the optimal solution of the model, so it’s no doubt that the most feasible circular bus route is obtained. The results have positive significance for promoting the construction and operation of public transport integration and promoting the convenience and efficiency of public transport travel. 

scholarly journals Urban expansion and neighbourhood commuting patterns in the Beijing metropolitan region: A multilevel analysis

Urban Studies ◽  
2019 ◽  
Vol 57 (13) ◽  
pp. 2773-2793
Author(s):  
Cecilia Wong ◽  
Wei Zheng ◽  
Miao Qiao
Keyword(s):  
Urban Expansion ◽  
Explanatory Power ◽  
Multilevel Modelling ◽  
Interactive Effects ◽  
Metropolitan Region ◽  
The Novel ◽  
Commuting Flows ◽  
Home Work ◽  
Commuting Patterns ◽  
Modelling Approach

This study adopts a spatial perspective to analyse the complex commuting patterns of the Beijing metropolitan region. By combining measures of the built environment, neighbourhood characteristics and development time periods, a four-fold neighbourhood classification was derived by cluster analysis to reflect different urbanisation contexts. Commuting flows were mapped to illustrate the spatial mismatch of home–work locations during the rampant urbanisation process. The novel use of a multilevel modelling approach shows how individual socio-economic attributes and neighbourhood factors, and their interactive effects, explain the varied commuting patterns. The cross-level interactions of variables highlight the predominant influence of individual attributes, which also interact with locational conditions of neighbourhood with differential explanatory power, on commuting patterns.

scholarly journals Can a polycentric structure affect travel behaviour? A comparison of Melbourne, Australia and Riyadh, Saudi Arabia

2014 ◽  
Vol 22 (3) ◽  
pp. 156-166 ◽  
Author(s):  
M. Alqhatani ◽  
S. Setunge ◽  
S. Mirodpour
Keyword(s):  
Travel Time ◽  
Scenario Analysis ◽  
Public Transport ◽  
Transport Model ◽  
Urban Expansion ◽  
Travel Behaviour ◽  
Private Car ◽  
The Impact ◽  
Productive Time ◽  
Public Transport Service

Abstract This study models the impact of the shift from a monocentric private-car-oriented city to polycentric public-transport-oriented city. Metropolitan areas have suffered traffic problems—in particular increase in travel time and travel distance. Urban expansion, population growth and road network development have led to urban sprawl in monocentric cities. In many monocentric cities, travel time and distance has steadily increased and is only expected to increase in the future. Excessive travel leads to several problems such as air pollution, noise, congestion, reduction in productive time, greenhouse emissions, and increased stress and accident rates. This study examines the interaction of land use and travel. A model was developed and calibrated to Melbourne and Riyadh conditions and used for scenario analysis. This model included two parts: a spatial model and a transport model. The scenario analysis included variations of residential and activity distribution, as well as conditions of public transport service.

scholarly journals Modelling and simulating ‘informal urbanization’: An integrated agent-based and cellular automata model of urban residential growth in Ghana

2022 ◽  
pp. 239980832110688
Author(s):  
Felix S. K. Agyemang ◽  
Elisabete Silva ◽  
Sean Fox
Keyword(s):  
Cellular Automata ◽  
Growth Model ◽  
Urban Growth ◽  
Urban Expansion ◽  
City Region ◽  
African City ◽  
Local Data ◽  
Support Tool ◽  
Agent Based ◽  
Urban Growth Model

The global urban population is expected to grow by 2.5 billion over the next three decades, and 90% of this growth will occur in African and Asian countries. Urban expansion in these regions is often characterised by ‘informal urbanization’ whereby households self-build without planning permission in contexts of ambiguous, insecure or disputed property rights. Despite the scale of informal urbanization, it has received little attention from scholars working in the domains of urban analytics and city science. Towards addressing this gap, we introduce TI-City, an urban growth model designed to predict the locations, legal status and socio-economic status of future residential developments in an African city. In a bottom-up approach, we use agent-based and cellular automata modelling techniques to predict the geospatial behaviour of key urban development actors, including households, real estate developers and government. We apply the model to the city-region of Accra, Ghana, drawing on local data collection, including a household survey, to parameterise the model. Using a multi-spatial-scale validation technique, we compare TI-City’s ability to simulate historically observed built-up patterns with SLEUTH, a highly popular urban growth model. Results show that TI-City outperforms SLEUTH at each scale, suggesting the model could offer a valuable decision support tool in similar city contexts.

scholarly journals Mapping the morphology of sprawl and blight: A note on entropy

GeoScape ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 1-18
Author(s):  
Reza Banai ◽  
Anzhelika Antipova ◽  
Ehsan Momeni
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Urban Expansion ◽  
Entropy Change ◽  
Metropolitan Region ◽  
List Type ◽  
Block Group ◽  
City Region ◽  
City Center ◽  
The City

Abstract The urban expansion from the city center to the suburb and beyond is indicated by Shannon entropy, a robust and versatile measure of sprawl. However, the metropolitan regionwide entropy masks the morphology of land cover and land use consequential to urban expansion within the city-region. To surmount the limitation, we focus on the block-group, which is a US census defined socio-spatial unit that identifies the metropolitan region’s development pattern structurally, forming tracts that comprise neighborhoods. The concentration and dispersion of land use and land cover by block-group reveals a North American metropolitan region’s commonly known but rarely measured spatial structure of its urban and suburban sprawl. We use parcel data from county assessor of property (GIS) and land cover pixel data from the National Land Cover Data (NLCD) to compute block-group land-use and land-cover entropy. The change in block group entropy over a decade indicates whether the city- region’s land use and land cover transition to a concentrated or dispersed pattern. Furthermore, we test a hypothesis that blight correlates with sprawl. Blight and sprawl are among the key factors that plague the metropolitan region. We determine the correlations with household income as well as (block group) distance from the city center. It turns out, blight is among the universally held distance-decay phenomena. The share of the block group’s blighted properties decays (nonlinearly) with distance from the city center. Highlights for public administration, management and planning: • The metropolitan region’s outward growth is highlighted by mapping the changing morphology of the block group within the city-region. • The block group entropy is computed with land use (parcel) and land cover (pixel) data. • The block group entropy change indicates the pattern of the land use and land cover transition with concentration or dispersion. • We test the hypothesis that blight correlates with sprawl with statistical models. • The block group’s blighted properties decrease (nonlinearly) with distance from the city center.

Ancient and current resilience in the Chengdu Plain: Agropolitan development re-‘revisited’

Urban Studies ◽  
2019 ◽  
Vol 57 (7) ◽  
pp. 1372-1397 ◽  
Author(s):  
Daniel B Abramson
Keyword(s):  
Forest Cover ◽  
Agricultural Landscape ◽  
Landscape Heterogeneity ◽  
Irrigation System ◽  
Urban Expansion ◽  
Flood Management ◽  
Ecological Resilience ◽  
City Region ◽  
Chengdu Plain ◽  
Landscape Preservation

The Dujiangyan irrigation system, China’s largest, is one of the world’s most important examples of sustainable agropolitan development, maintained by a relatively decentralised system of governance that minimises bureaucratic oversight and depends on significant local autonomy at many scales down to the household. At its historic core in the Chengdu Plain, the system has supported over 2000 years of near-continuously stable urban culture, as well as some of the world’s highest sustained long-term per-hectare productivity and diversity of grain and other crops, especially considering its high population density, forest cover, general biodiversity and flood management success. During the past decade, rapid urban expansion has turned the Chengdu Plain from a net grain exporter into a grain importer, and has radically transformed its productive functioning and distinctive scattered settlement pattern, reorganising much of the landscape into larger, corporately-managed farms, and more concentrated and infrastructure-intensive settlements of non-farming as well as farming households. Community-scale case studies of spatial-morphological and household socio-economic variants on the regional trend help to articulate what is at stake. Neither market-driven ‘laissez-faire’ rural development nor local state-driven spatial settlement consolidation and corporatisation of production seem to correlate well with important factors of resilience: landscape heterogeneity; crop diversity and food production; permaculture; and flexibility in household independence and choice of livelihood. Management of the irrigation system should be linked to community-based agricultural landscape preservation and productive dwelling, as sources of adaptive capacity crucial to the social-ecological resilience of the city-region, the nation and perhaps all humanity.

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