Xiang Chen

Xiang Chen
University of Connecticut | UConn · Department of Geography

Doctor of Philosophy

About

59
Publications
53,807
Reads
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1,594
Citations
Introduction
I am an Assistant Professor in the Department of Geography at the University of Connecticut. My research interests are focused on GIScience and community health. My topical area is food access, evaluating if community members have equitable access to healthy, affordable foods. I also have research interests in transportation studies, such as accessibility, location models, and network analysis.
Education
September 2009 - June 2014
The Ohio State University
Field of study
  • Geography
September 2007 - June 2009
Beijing Normal University
Field of study
  • Land Resource Management
September 2003 - June 2007
Beijing Normal University
Field of study
  • Resource Science and Engineering

Publications

Publications (59)
Article
We examined the uncertainty of the contextual influences on food access through an analytic framework of the uncertain geographic context problem (UGCoP). We first examined the compounding effects of two kinds of spatiotemporal uncertainties on people's everyday efforts to procure food and then outlined three key dimensions (food access in real tim...
Article
Full-text available
The recent decade has witnessed a new wave of development in the place-based accessibility theory, revolving around the two-step floating catchment area (2SFCA) method. The 2SFCA method, initially serving to evaluate the spatial inequity of health care services, has been further applied to other urban planning and facility access issues. Among thes...
Preprint
Full-text available
In the early development of COVID-19, large-scale preventive measures, such as border control and air travel restrictions, were implemented to slow international and domestic transmissions. When these measures were in full effect, new cases of infection would be primarily induced by community spread, such as the human interaction within and between...
Article
Geographical research on the community food environment emphasizes the spatial dimension of food access, where food quality and nutrition are overlooked. While the nutritional quality of food stores can be evaluated by audit tools, such as the Nutrition Environment Measurement Survey series, these tools cannot be readily applied on a large scale. T...
Article
Full-text available
As the COVID-19 vaccination has been quickly rolling out around the globe, the evaluation of the effects of vaccinating populations for the safe reopening of schools has become a focal point for educators, decision-makers, and the general public. Within this context, we develop a contact network agent-based model (CN-ABM) to simulate on-campus dise...
Article
Full-text available
Background One critical variable in the time series analysis is the change point, which is the point where an abrupt change occurs in chronologically ordered observations. Existing parametric models for change point detection, such as the linear regression model and the Bayesian model, require that observations are normally distributed and that the...
Article
Full-text available
The bike-sharing system has advanced urban transportation by solving “the last mile problem,” enabling riders to better connect to public transit. There has been a paucity of knowledge, however, regarding the relationship between bike-sharing and public transit. In this article, we solicit one year of bike trip data comprising approximately 17 mill...
Chapter
During the COVID-19 pandemic, consumers’ food procurement activities underwent considerable transformations due to restrictive policies on social distancing. These behavioral changes induced a new industrial landscape within the food retail sector, with franchise stores gaining more consumers and more intensive competition occurring across online f...
Article
Full-text available
Mass COVID-19 vaccination, as the last resort to bring society to a new normal, has been rapidly rolled out in the US. However, because of the lifting of international travel restrictions, amid the many uncertainties induced by the emerging B.1.1.529 variant, it remains unclear about the timeline of reaching herd immunity and when our daily life wi...
Technical Report
Full-text available
The UConn Rudd Center conducts research to inform policy solutions that address inequities in childhood health, poor nutrition, and weight bias. In collaboration with the Connecticut State Department of Education, the Rudd Center conducted a study that examined the 2021 USDA Summer Meal Program's open sites in Connecticut. In order to learn more ab...
Article
Full-text available
Deep learning models can recognize the food item in an image and derive their nutrition information, including calories, macronutrients (carbohydrates, fats, and proteins), and micronutrients (vitamins and minerals). This technology has yet to be implemented for the nutrition assessment of restaurant food. In this paper, we crowdsource 15,908 food...
Article
Full-text available
Spatiotemporal representation is one of the critical areas receiving ongoing interest in GIScience. The ever-growing spatiotemporal big data, however, pose considerable challenges to temporal representation as existing methods predominantly use one-dimensional chronological timeline representations. Aiming to represent the lifespans of spatiotempor...
Article
Full-text available
The increasing popularity of Wi-Fi enabled smart devices, such as cell phones, poses unprecedented opportunities for modeling large-scale human movement trajectories. While these datasets enable the extended spatiotemporal scales and refined granularities for human dynamics research, the lack of semantic information hinders the understanding of the...
Article
Full-text available
Background In the United States, distribution plans for the COVID-19 vaccination were established at the state level. However, some states, such as Connecticut, followed an age-based strategy without considering occupations or co-morbid conditions due to its simplicity in implementation. This strategy raised concerns about exacerbating health inequ...
Preprint
Full-text available
Background: As phases of COVID-19 vaccination are quickly rolling out, how to evaluate the vaccination effects and then make safe reopening plans has become a prime concern for local governments and school officials. Methods: We develop a contact network agent-based model (CN-ABM) to simulate on-campus disease transmission scenarios at the micro-sc...
Poster
Full-text available
Many government agencies have collected and distributed spatial information about Coronavirus Disease 2019 (COVID-19) through Web Geographic Information Systems (GIS), the most popular of which are dashboards. Unfortunately, maps on these dashboards are not always created using established cartographic principles. One such principle violated by man...
Article
Full-text available
Objectives The retail food industry, a major essential business, is among the very few thriving sectors during the COVID-19 pandemic. However, such prosperity on the store side does not guarantee a sufficient food supply for all populations. This study aims to understand if people’s risk perception and food security status shaped their food procure...
Article
One primary action plan in the Healthy China 2030 initiative is to build innovative patient referral models for health care reform in China. To ensure people have sufficient and equitable health care access when the patient referral policy is enforced, a systematic evaluation of its effects on the health care system is needed. In this paper, we foc...
Article
Full-text available
In the early development of COVID-19, large-scale preventive measures, such as border control and air travel restrictions, were implemented to slow international and domestic transmissions. When these measures were in full effect, new cases of infection would be primarily induced by community spread, such as the human interaction within and between...
Article
Full-text available
Purpose: This paper aims to evaluate the early effects of the pandemic of coronavirus disease 2019 (COVID-19) and accompanying stay-at-home orders on restaurant demand in U.S. counties. Design/methodology/approach: Two sets of daily restaurant demand data were collected for each U.S. county: foot traffic data and card transaction data. A two-way f...
Article
Full-text available
The lack of an active neighbourhood living environment can impact community health to a great extent. One such impact manifests in walkability, a measure of urban design in connecting places and facilitating physical activity. Although a low level of walkability is generally considered to be a risk factor for childhood obesity, this association has...
Article
Full-text available
As one of the few operating retail sectors, the food retail industry is encountering unique challenges and opportunities during the 2019 Novel Coronavirus. The pandemic led to various transformations in the food retail industry, including changes in consumers perception and behavior. Although the pandemic has a situational nature, such transformati...
Article
Various measures of the obesogenic environment have been proposed and used in childhood obesity research. The variety of measures poses methodological challenges to designing new research because methodological characteristics integral to developing the measures vary across studies. A systematic review has been conducted to examine the associations...
Article
Full-text available
• We propose a DSGE model to examine the impact of the coronavirus outbreak on tourism • The model is generalizable to any epidemic • The model supports the policy of providing tourism consumption vouchers for residents
Article
Full-text available
The lack of access to public transport is generally considered to be a risk factor for childhood obesity by discouraging active transport and thus physical activity. To explore the association between access to public transport and childhood obesity, we have conducted a systematic literature search in the Cochrane Library, PubMed, and Web of Scienc...
Article
The recent decade has witnessed a new wave of development in the place-based accessibility theory, revolving around the two-step floating catchment area (2SFCA) method. The 2SFCA method, initially serving to evaluate the spatial inequity of health care services, has been further applied to other urban planning and facility access issues. Among thes...
Article
Full-text available
Nuclear power has become a common source of energy for communities around the world. Despite relatively few global incidents, the potential for nuclear disaster always exists. Effective risk communication plays a critical role in reducing the loss of life and property when a nuclear failure arises. An overlooked aspect of existing studies on nuclea...
Conference Paper
Full-text available
Accessibility, as an important theme in geospatial science, measures the potential of interaction between geographic entities. Originated in Hansen’s (1959) empirical model for land use planning, place-based accessibility becomes an integrated assessment of urban settlements in relation to social services and opportunities, such as employment, educ...
Article
Full-text available
Extreme weather events affect the development and survival of disease pathogens and vectors. Our aim was to investigate the potential effects of heat waves on the population dynamics of Asian tiger mosquito (Aedes albopictus), which is a major vector of dengue and Zika viruses. We modeled the population abundance of blood-fed mosquito adults based...
Article
Full-text available
Urban open places with a public service function (e.g., urban parks) are likely to be populated in peak hours and during public events. To mitigate the risk of overcrowding and even events of stampedes, it is of considerable significance to realize a real-time full coverage estimate of the population density. The main challenge has been the limited...
Preprint
Full-text available
In this paper, a Gaussian-based two-step floating catchment area (2SFCA) model is applied to evaluate the geographical accessibility to the Supplemental Nutrition Assistance Program (SNAP) authorized retailers. First, the proposed method considers the interaction between the food supply (in terms of categorized benefit redemptions) and demand (in t...
Article
Full-text available
Cloud removal is a prerequisite for the application of Landsat datasets, as such satellite images are invariably contaminated by clouds. Clouds affect the transmission of radiation signal to different degrees because of their different thicknesses, shapes, heights and distributions. Existing methods utilize pixel replacement to remove thick clouds...
Article
Full-text available
Because of the limited spatiotemporal resolutions in vegetation index (VI) products, land surface phenology (LSP) results may not well capture ground-based phenological changes. This is likely the result of the mixed pixel effect: (1) a pixel in VI products may contain an unknown composition of vegetation species or land cover types; and (2) these...
Article
Full-text available
Research on metro systems has been a multi-faceted field ranging from the accessibility of the networks to passengers’ utilities gained from their riding experience. In addition to issues of affordability, safety, and intermodal connectivity, a critical aspect to enhance metro riders’ experience is through non-travel related in-station facilities,...
Article
Full-text available
The housing market in Chinese metropolises have become inflated significantly over the last decade. In addition to an economic upturn and housing policies that have potentially fueled the real estate bubble, factors that have contributed to the spatial heterogeneity of housing prices can be dictated by the amenity value in the proximity of communit...
Article
Measures of geographic food access overlook an important source of statistical biases, termed the edge effect. The edge effect refers to the fallacy that events contributing to the spatial pattern of an analysis unit may be outside of that unit; thus merely summarizing events within the unit may lead to distortion of the estimation. Food procuremen...
Article
Plastic greenhouses (PGs) are an important agriculture development technique to protect and control the growing environment for food crops. The extensive use of PGs can change the agriculture landscape and affects the local environment. Accurately mapping and estimating the coverage of PGs is a necessity to the strategic planning of modern agricult...
Article
Full-text available
The concept of vulnerability has been employed to develop transport systems that sustain devastating disasters and ensure the efficient evacuation of neighborhoods. Existing studies of road network vulnerability overlook two important aspects of analysis: the no-notice evacuation and the different objectives of evacuees and first responders. First,...
Article
Full-text available
Background Global warming has a marked influence on the life cycle of epidemic vectors as well as their interactions with human beings. The Aedes albopictus mosquito as the vector of dengue fever surged exponentially in the last decade, raising ecological and epistemological concerns of how climate change altered its growth rate and population dyna...
Article
The false topographic perception phenomenon (FTPP) refers to the visual misperception in remote-sensing images that certain types of terrains are visually interpreted as other types in rugged lands, for example, valleys as ridges and troughs as peaks. For this reason, the FTPP can influence the visualization and interpretation of images to a great...
Article
Full-text available
Background The mosquito Aedes albopitus is a competent vector for the transmission of many blood-borne pathogens. An important factor that affects the mosquitoes’ development and spreading is climate, such as temperature, precipitation and photoperiod. Existing climate-driven mechanistic models overlook the seasonal pattern of diapause, referred to...
Article
In China, the term food safety has become a buzzword that evokes concerns from individual consumers as well as food policy stakeholders. Understanding consumers' awareness of the problem is crucial to formulating custom actions to facilitate health communication and eventually improve food security. This paper employs an atypical type of social med...
Data
Full-text available
We examined the uncertainty of the contextual influences on food access through an analytic framework of the uncertain geographic context problem (UGCoP). We first examined the compounding effects of two kinds of spatiotemporal uncertainties on people’s everyday efforts to procure food and then outlined three key dimensions (food access in real tim...
Article
Typical measures of food access use spatial-only methods to identify nearby food outlets and the quantity, quality, and variety of food available. This measure of spatial access falls short in explaining the effect that the operating hours of food retailers have on food access. Our study aims to complement the spatial dimension of access measures b...
Article
Site planning for parks consists of synthetic strategies to improve visitors’ experience and appreciation of park features. An important aspect in site planning is to coordinate visitor flows in order to avoid excessive congestion that may depreciate visiting experience. An emerging need in the coordination strategies is to personalize visiting rou...
Thesis
Full-text available
Access to healthful food is imperative to physical well-being and quality of life. Failing to acquire and consume healthful food on a regular basis would lead to a series of adverse health outcomes. To date, the majority of the literature concerns food access as a geographical problem and discusses the disparity in access from a pure spatial perspe...
Article
The problem of emergency facility location is a critical component in evacuation planning. The emergence of geographic information systems (GIS) has provided a useful operational platform to assist this issue. A previously overlooked facet is the consideration of a hierarchical structure in the placement of emergency shelters. Due to the fact that...
Article
In classical time geography, an individual travel path is composed of a chain of visits, with each visit being a flexible activity between two fixed activities at two known stations. In reality, individuals tend to carry out trips with much variation and complexity, with multipurpose trips being a prominent and pervasive phenomenon. There is limite...
Article
In urban areas, the occurrence of disasters can cause extensive damage to human society. For this reason, evacuation, regarded as a critical course of action to relocate people and property, helps to alleviate loss of life and property to a great extent. Risk associated with evacuation is an abstract concept that cannot be easily conceptualized. Th...
Article
The Critical Cluster Model (CCM) is an optimization model assessing the evacuation risk on the scale of neighborhoods. The static evacuation risk in the CCM is measured by Bulk Lane Demand (BLD) — an index that solely depends on network structure and population of evacuees. The advantage of the CCM is having less input parameters and with relativel...

Questions

Question (1)
Question
I have discussed this question with my US colleagues in geography, my friend in biology, and geographers in China; and I received very different answers. For example, people in biology seem to take corresponding authorship more seriously than the first author because it is considered the leading person in a research project. In China, geoscientists also value the corresponding authorship because it represents the ability of mentoring students. It seems to me that in the US (and maybe in other countries), geographers care less about the corresponding authorship than the order of the authors. As a young scholar, I am very curious about the question. 

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Projects

Projects (5)
Project
Mapping and simulating COVID-19 with GIS and epidemic models.
Project
We are applying econometrics and big data analytics to monitor, analyze, and predict the socio-economic impact of coronavirus pandemic on the global tourism and hospitality industry.