Mei-Po Kwan

Mei-Po Kwan
The Chinese University of Hong Kong | CUHK · Department of Geography and Resource Management

PhD (University of California, Santa Barbara)

About

394
Publications
130,063
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
17,779
Citations
Introduction
I am Choh-Ming Li Professor of Geography and Resource Management and Director of the Institute of Space and Earth Information Science at the Chinese University of Hong Kong. My research interests include environmental health, human mobility, sustainable cities, and GIScience. Please visit my website for more information about my work at http://meipokwan.org.
Additional affiliations
August 2013 - August 2020
University of Illinois, Urbana-Champaign
Position
  • Professor (Full)
Education
September 1990 - June 1994
September 1985 - June 1989
University of California, Los Angeles
Field of study
  • Urban Planning

Publications

Publications (394)
Article
Full-text available
Any study that examines the effects of area-based attributes on individual behaviors or outcomes faces another fundamental methodological problem besides the modifiable areal unit problem (MAUP). It is the problem that results about these effects can be affected by how contextual units or neighborhoods are geographically delineated and the extent t...
Article
Full-text available
Ignoring people’s daily mobility and exposures to nonresidential contexts may lead to erroneous results in epidemiological studies of people’s exposures to and the health impact of environmental factors. This paper identifies and describes a phenomenon called neighborhood effect averaging, which may significantly confound the neighborhood effect as...
Article
Full-text available
This article draws on recent studies to argue that researchers need to be attentive to the limits of the neighborhood effect as conventionally understood. It highlights the complexities of contextual influences and the challenges in accurately representing and measuring individual exposures to those influences. Specifically, it discusses the idiosy...
Article
Full-text available
Drawing on examples from human mobility research, I argue in this article that the advent of big data has significantly increased the role of algorithms in mediating the geographic knowledge production process. This increased centrality of algorithmic mediation introduces much more uncertainty to the geographic knowledge generated when compared to...
Article
Full-text available
Many fundamental notions in geographic and social science research still tend to be conceptualized largely in static spatial terms, ignoring how our understanding of the issues we study can be greatly enriched through the lenses of time and human mobility. This article revisits three such notions: racial segregation, environmental exposure, and acc...
Article
Full-text available
China implemented the first phase of its National Healthy Cities pilot program from 2016-20. Along with related urban health governmental initiatives, the program has helped put health on the agenda of local governments while raising public awareness. Healthy City actions taken at the municipal scale also prepared cities to deal with the COVID-19 p...
Article
PM2.5 concentrations prediction faces the challenge of insufficient ground stations and a lack of monitoring capability for future expectations. In this study, we performed time-series prediction of daily PM2.5 concentrations at the monitoring sites in the Pearl River Delta (PRD) region, China, based on Bidirectional Long Short-term Memory (BiLSTM)...
Article
Housing pressure is one of the most important factors affecting urban residents' quality of life and subjective well-being (SWB). However, few studies have examined the impact of housing pressure on people's SWB and whether housing pressure has heterogeneous effects on SWB in cities of different sizes and for different social groups is still under-...
Article
City planners are increasingly captivated by the possibilities of transforming urban spatial structures as an important strategy for reducing heat island intensity. This study addresses the mixed findings of polycentric urban spatial structures on surface urban heat island intensity, using a multiple regression method and pathway analysis for the c...
Article
Full-text available
As a crucial component of urban green space (UGS), urban parks have been found to be closely associated with the health of urban residents. Drawing on a large-scale survey, “International First-class Harmonious and Livable Capital”, in Beijing conducted in 2018, this paper examines the impact of subjective and objective characteristics of UGS on re...
Article
To date, most studies have assessed individual exposure to neighborhood physical disorder (NPD) through the static residence-based approach, which ignores elements of human mobility and may lead to inaccurate estimates. This study assessed individual exposure to neighborhood physical disorder through the mobility-based approach using wearable camer...
Article
Distance from competitors is a key factor in retail site selection and profitability. To understand the locational tendency that each newly opened outlet locates close to or far from existing competitors in a target area, a specific method is needed. Hence, this study aims first to develop a statistical method to discover the local spatial associat...
Article
Full-text available
Many people have worried about COVID-19 infection, job loss, income reduction, and family conflict during the COVID-19 pandemic. Some social groups may be particularly vulnerable due to their residential neighborhoods and daily activities. On the other hand, people’s daily exposure to greenspace offers promising pathways for reducing these worries...
Article
Spatial flow outlier (SFO) detection aims to discover spatial flows whose non-spatial attribute values are significantly different from their neighborhoods. Different from spatial flow clusters, which are the main concern in the current literature, SFOs represent unusual local instabilities and are valuable for revealing anomalous spatial interacti...
Article
With the ongoing spread of COVID-19, vaccination stands as an effective measure to control and mitigate the impact of the disease. However, due to the unequal distribution of COVID-19 vaccination sites, people can have different levels of spatial accessibility to COVID-19 vaccination. This study adopts an improved gravity-based model to measure the...
Article
Many geographic studies examined the spatial relationships between store locations that promote urban growth through agglomeration effects. One of the key relationships is co‐location, the spatial proximity among different types of facilities within a specific distance. To analyze co‐location with statistical inference, several studies have employe...
Article
Full-text available
The online public food environment (OPFE) has had a considerable impact on people's lifestyles over the past decade; however, research on its exposure is sparse. The results of the existing research on the impact of the food environment on human health are inconsistent. In response to the lack of food elements in the definition of the food environm...
Article
Vegetable crops have varied heavy metal(loid)s accumulation rates from soils to their edible tissues. However, crop selection has been seldom evaluated as a strategy for reducing the health risks of ingesting vegetables grown in soils contaminated by treated wastewater (TWW) irrigation. We cultivated twenty commonly grown vegetables using soils wit...
Article
Inequalities in accessibility to grocery stores can lead to disparate health outcomes among the population. Although existing studies have examined grocery accessibility inequality across income and racial/ethnic groups, little research has been dedicated to revealing the intra‐racial disparities of grocery accessibility and comparing inter‐racial...
Article
The widespread use of personal geospatial data raises serious geoprivacy concerns for sharing these data, which may limit the reproducibility of research findings. One widely used method for securely sharing confidential geospatial information is applying geomasking techniques before sharing. Geomasking may reduce the usability of the data. Thus, r...
Article
Full-text available
Background Public transport use is essential for the subjective wellbeing of older people. A well-designed public transport system may support social participation that can alleviate social isolation and improve subjective wellbeing. However, it remains unclear about the mediating effects of social isolation on the pathway linking public transport...
Article
Full-text available
In this study, we examined the relationships between housing characteristics, neighborhood built-environment features, and people’s mental health in Hong Kong, an Asian city well known for its high-density and high-rise housing. The potential mediating effects of people’s perceived living environment were also considered in the analysis. We collect...
Article
Ambient air pollution plays a significant role in an increased risk of incidence and mortality of COVID-19 on a global scale. This study aims to understand the multiscale spatial effect of global air pollution on COVID-19 mortality. Based on forty-six cities from six countries worldwide between 1 April 2020 and 31 December 2020, a Bayesian space–ti...
Article
Public transit is the main travel mode for residents in major urban areas to access different socioeconomic resources. Nodal accessibility can be used to measure the level of transit-based connectivity for residents from one neighborhood to socioeconomic resources in other neighborhoods. While many existing studies have measured the spatial inequal...
Article
Full-text available
Objectives: To determine the association of sleep with mental health among Hong Kong community-dwelling older men in the context of the COVID-19 pandemic. Methods: This additional analysis was derived from the community-dwelling men aged >60 recruited during three COVID-19 outbreaks (i.e., pre-outbreak, between the second and third wave, and during...
Article
The Blue Lentic Belt is a spatial belt of dense lentic habitats formed in the Mobile River Basin since the 1990s, and it is imposing considerable environmental stress on local and downstream aquatic habitats. Depicting the spatiotemporal evolution of the Blue Lentic Belt is essential to understanding its formation and consequential impacts on local...
Article
Full-text available
Background Few mobility-based studies have investigated the associations between multiple environmental exposures, including social exposures, and mental health. Objective To assess how exposure to green space, blue space, noise, air pollution, and crowdedness along people's daily mobility paths are associated with anxiety symptoms. Methods 358 p...
Article
Bike-sharing improves individual mobility, considerably reshaping the landscape of job accessibility and commuting time. Existing empirical studies in urban transportation involving commuting usually collect survey data at the aggregate level. A comprehensive understanding of the influence of bike-sharing on commuting and job accessibility at the c...
Article
Full-text available
This paper seeks to evaluate and calibrate data collected by low-cost particulate matter (PM) sensors in different environments and using different aggregated temporal units (i.e., 5-s, 1-min, 10-min, 30 min intervals). We first collected PM concentrations (i.e., PM1, PM2.5, and PM10) data in five different environments (i.e., indoor and outdoor of...
Article
Social differences in China tend to be complicated by the hukou system that ties welfare entitlement to a person's hukou status. There is no exception for the differences between ethnic minorities and majorities in Chinese cities. This study examines the interaction between ethnic dissimilarity and hukou division in urban China. It investigates whe...
Article
Planning public services needs to promote equal access across geographic areas and between demographic groups. However, most location-allocation models emphasize efficiency such as minimal travel burden or maximal demand coverage while omitting the equality issue. This case study optimizes the emergency medical service (EMS) in Shanghai from a trad...
Article
Full-text available
In this commentary we reflect on the potential and power of geographical analysis, as a set of methods, theoretical approaches, and perspectives, to increase our understanding of how space and place matter for all. We emphasize key aspects of the field, including accessibility, urban change, and spatial interaction and behavior, providing a high‐le...
Article
Low-carbon travel of urban residents is an important issue of public concern for sustainable development of global cities under climate change. The carbon emissions generated by school trips occupy a significant proportion of the carbon emissions of people's travel and are increasing year by year. In this paper, we review the progress in research o...
Article
Full-text available
The atmospheric particles and aerosols from burning usually cause visual artifacts in single images captured from fire scenarios. Most existing haze removal methods exploit the atmospheric scattering model (ASM) for visual enhancement, which inevitably leads to inaccurate estimation of the atmosphere light and transmission matrix of the smoky and h...
Article
Full-text available
This article provides a state-of-the-art summary of location privacy issues and geoprivacy-preserving methods in public health interventions and health research involving disaggregate geographic data about individuals. Synthetic data generation (from real data using machine learning) is discussed in detail as a promising privacy-preserving approach...
Preprint
Full-text available
In this commentary we reflect on the potential and power of geographical analysis, as a set of methods, theoretical approaches, and perspectives, to increase our understanding of how space and place matter for all. We emphasize key aspects of the field, including accessibility, urban change, and spatial interaction and behavior, providing a high-le...
Article
Constructing and renovating urban parks is an effective strategy for high-density cities to satisfy residents’ needs for recreation in nature. Using Hong Kong as an example of a high-density city, the purpose of this study was to examine the associations of park and neighbourhood environments with park-based physical activity (PA) among children an...
Article
Full-text available
Understanding the spatiotemporal variation of high-efficiency ride-hailing orders (HROs) is helpful for transportation network companies (TNCs) to balance the income of drivers through reasonable order dispatch, and to alleviate the imbalance between supply and demand by improving the pricing mechanism, so as to promote the sustainable and healthy...
Article
Solar farming has been experiencing explosive development in recent years. However, developing solar farming in urban areas is challenged by the heterogeneous distribution of solar irradiation in spatial and degradation of photovoltaic (PV) efficiency that make the economic performance uncertain. To tackle this problem, this study develops a spatio...
Article
Accurately assessing individual exposures to traffic congestion and traffic-related emissions is important for evaluating the impact of traffic congestion on human health. Existing studies on individual exposures to traffic congestion focus mainly on commuting trips, while our understanding of individual exposures to traffic congestion during diffe...
Article
Full-text available
The quality of urban settlement is an essential element of people's desire for a better life, which has been capitalized into housing prices of local cities. However, previous literature focuses overwhelmingly on the determinants of intracity housing prices. There is still a lack of research on the determinants of the spatial disparity in intercity...
Article
Air pollution is a great concern due to its adverse health effects, and reducing air pollution is a major challenge worldwide. Utilizing the air quality monitoring data of the Yangtze River Delta (YRD) from 2016 to 2018, this paper first investigates the spatiotemporal patterns of the Air Quality Index (AQI), identifies the primary pollutants for e...
Article
This paper investigates the interrelationships of place qualities, people’s sense of place and subjective well-being in the ultra-high-density environment of urban Hong Kong. We argue that place qualities affect people’s sense of place that predicts their subjective well-being. The study develops two scales on place qualities and sense of place, an...
Article
Full-text available
Given the important role of green environments playing in healthy cities, the inequality in urban greenspace exposure has aroused growing attentions. However, few comparative studies are available to quantify this phenomenon for cities with different population sizes across a country, especially for those in the developing world. Besides, commonly...
Article
People’s exposure to high levels of sound leads to psychological annoyance and stress. This study seeks to understand and conceptualize how human daily mobilities influence urban residents’ sound exposure and psychological health involving annoyance and stress in their everyday lives. Human daily mobilities are understood as people’s daily movement...
Article
Previous studies observed that most COVID-19 infections were transmitted by a few individuals at a few high-risk places (e.g., bars or social gathering venues). These individuals, often called superspreaders, transmit the virus to an unexpectedly large number of people. Further, a small number of superspreading places (SSPs) where this occurred acc...
Article
Emergency medical service (EMS) is important for rescuing victims suffering from life-threatening illnesses or accidents, and is highly time-sensitive by nature. Many uncertain contexts in the urban environment can prolong EMS response time and deteriorate its performance. Using the enhanced two-step floating catchment area (E2SFCA) method, this st...
Article
Full-text available
Automatically extracting buildings from remote sensing images with deep learning is of great significance to urban planning, disaster prevention, change detection, and other applications. Various deep learning models have been proposed to extract building information, showing both strengths and weaknesses in capturing the complex spectral and spati...
Preprint
Since 2013, with the implementation of the toughest-ever clean air policy in China, the residential energy transition has been remarkable. However, how this policy affects household energy costs and its associated inequality remains unclear. In this paper, we assessed trends in the clean energy uptake in household stoves and fuels based on data fro...
Article
Spatial flow co-location patterns (FCLPs) are important for understanding the spatial dynamics and associations of movements. However, conventional point-based co-location pattern discovery methods ignore spatial movements between locations and thus may generate erroneous findings when applied to spatial flows. Despite recent advances, there is sti...
Article
Full-text available
Based on different conceptualizations and measures of individual-level environmental exposure, this study examines how the uncertain geographic context problem (UGCoP) and the neighborhood effect averaging problem (NEAP) might affect the assessment of COVID-19 risk. Using the COVID-19 data on an open-access government Web site and the individual-le...
Article
In many central districts in cities across the world, different types of stores form clusters resulting from the benefits of spatial agglomeration. To precisely analyze co-location relationships in a micro-scale space, this study develops a new statistical method by addressing the limitations of the ordinary cross K function method. The objectives...
Article
Research on the associations between environmental exposures and mental health has attracted considerable attention. Most studies to date have mainly estimated environmental health effects based on static geographic contexts (e.g., residential neighborhoods, administrative units), ignoring the dynamic nature of individual spatiotemporal behavior, w...
Article
Environmental justice is a crucial environmental and social problem. Previous research in the cities of developed countries has found that ethnic minorities and low-income people were disproportionately exposed to the residential environment with more serious environmental risks. This study proposed a transition from the residence-based perspective...
Article
Full-text available
Public transit is indispensable for car-free households to access healthcare. Meanwhile, different households have unequal transit-based healthcare accessibility due to different socio-economic factors such as race/ethnicity and car ownership. Few studies have comprehensively explored the inequality in transit-based healthcare accessibility by inte...
Article
Full-text available
Background Urban parks are critical environmental resources in which adolescents engage in physical activity (PA). Evidence on the associations between park environmental characteristics and park-based PA in adolescents is mixed, particularly for high-density cities. Evidence is also lacking concerning the moderating role of neighbourhood socioecon...
Article
The socio-spatial segregation experienced by migrants has attracted considerable attention and an increasing number of studies have examined segregation in migrants’ daily activity space recently. However, research on activity diversity and spatial contact between local residents and migrants has been limited. This paper fills this knowledge gap by...
Article
The built environment has been identified as a key factor for health intervention and obesity prevention. However, it is still unclear to what extent the built environment is associated with obesity and general health and to what extent such an association is mediated through variation in physical activity. This study aims to examine the associatio...
Article
Poor air quality and noise pollution have become major environmental risks in urban China. However, the effect of personal exposure to air pollution and noise in various traffic microenvironments on individuals’ daily travel satisfaction has rarely been investigated. Drawing upon real-time data collected using portable sensors and GPS tracking devi...
Article
Portable sensing, in which lightweight mobile sensors are used to measure stimuli, events, and human behavior, is a new and disruptive data collection paradigm. It has several methodological advantages compared to traditional methods and is suitable for investigating the dynamism of increasingly mobile and urban societies. In this article, we discu...
Article
Full-text available
An implicit assumption often made in research on the environmental determinants of health is that the relationships between environmental factors and their health effects are stable over space and time. This is the assumption of stationarity. The health impacts of environmental factors, however, may vary not only over space and time but also over t...
Article
Full-text available
This study compares the space‐time patterns and characteristics of high‐risk areas of COVID‐19 transmission in Hong Kong between January 23 and April 14 (the first and second waves) and between July 6 and August 29 (the third wave). Using space‐time scan statistics and the contact tracing data of individual confirmed cases, we detect the clusters o...
Article
Full-text available
This study extends an earlier study in the United States and South Korea on people’s privacy concerns for and acceptance of COVID-19 control measures that use individual-level georeferenced data (IGD). Using a new dataset collected via an online survey in Hong Kong, we first examine the influence of culture and recent sociopolitical tensions on peo...
Article
Full-text available
Many types of spatial flows, including pedestrian flows and vehicle flows, are constrained by and distribute on spatial networks. In the literature, network-constrained flows are usually modeled as a direct line in planar space using methods designed for flows in planar space. Further, in spatial statistical analysis of flow patterns, distance meas...
Article
Full-text available
The impact of Coronavirus Disease 2019 (COVID-19) on cause-specific mortality has been investigated on a global scale. However, less is known about the excess all-cause mortality and air pollution-human activity responses. This study estimated the weekly excess all-cause mortality during COVID-19 and evaluated the impacts of air pollution and human...