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Article

Visitor Flows at a Large-Scale Cultural Event: GPS Tracking at Dutch Design Week

1
Department of the Built Environment, Urban Systems and Real Estate, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
2
Department of the Built Environment, Architectural Urban Design and Engineering, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
*
Author to whom correspondence should be addressed.
ISPRS Int. J. Geo-Inf. 2020, 9(11), 661; https://0-doi-org.brum.beds.ac.uk/10.3390/ijgi9110661
Submission received: 10 October 2020 / Revised: 30 October 2020 / Accepted: 2 November 2020 / Published: 3 November 2020
(This article belongs to the Special Issue Geospatial Methods in Social and Behavioral Sciences)

Abstract

:
Large-scale cultural events bring many economic, social, and cultural benefits to the hosting cities. Although event producers aim to satisfy the visitors’ needs, they do not usually receive feedback on visitors’ experiences. Moreover, lack of spatial dispersal of visitors might result in less visibility for some activities and locations. An understanding of visitors’ spatial and temporal behavior and the factors influencing visitors’ intra-event destination choices is key to efficient and successful event management and future planning. In this article, we examine the relationship between visitors’ spatial and temporal behavior, the spatial structure of the host city, and visitor characteristics. In order to do this, data are collected from 281 event visitors by means of GPS tracking and paper surveys at the Dutch Design Week (DDW) 2017 event in Eindhoven, the Netherlands. Data are used to understand the area of interest locations, visitor flows, visitor clusters and area of interest choices by applying data processing, network analysis, cluster analysis and bivariate analysis. The results show that one of the three dedicated event areas was considerably less popular by the DDW visitors. Moreover, the choice of intra-event destination locations and areas depended mainly on temporal constraints of the visitors. The findings of this study can inform future event planning and management policies in hosting cities.

1. Introduction

Large-scale cultural events and festivals in cities are recognized as significant tools for building the city image and attracting visitors [1]. Such events and festivals bring economic, social and cultural advantages to cities which then can be used to (re)generate places for better living, working and visiting conditions. Cities and event organizers have the responsibility to provide positive experiences for visitors in order to improve visitor satisfaction and stimulate repeated visits [2]. Large-scale events usually result in short-term fluctuations in the city’s population because of the influx of visitors [3]. Fluctuations in the city’s population might have an impact on the infrastructure and logistics, and cause negative experiences for visitors and residents (i.e., visitor congestion or overcrowding due to the promotion of already prominent public spaces and environmental deterioration due to litter and noise). Moreover, if visitors are not well navigated during an event, only the prominent locations of the city are frequented by the visitors and therefore not all exhibition locations may be visited. This might result in less economic, social and cultural advantages for these places.
During large-scale cultural events that are distributed to different areas in a city, it is difficult to obtain comprehensive feedback on visitors’ flows. Having such feedback can help understanding visitors’ spatial and temporal behavior, intra-event destinations and their relations and intra-event destination choices during the event. Consequently, diverse suggestions can be provided to visitors and event providers for better organized events and even distribution of visitors. Therefore, in order to evaluate the organization of the event and to develop sustainable policies for event tourism, it is vital to investigate visitors’ flows during large-scale events [4].
In the last two decades, due to the increase in the availability of information and communications technology (ICT) tools (i.e., smartphone apps) and location positioning systems (i.e., global positioning system (GPS)), data-driven research on tourism and tourist flows has increased [5,6]. These technologies allow for capturing the mobility patterns of individuals, episodes and location of activities, the points of interests and the topology of activities in relation to the urban environment. According to Shoval and Ahas (2016) [6], the advantages of collecting data using GPS loggers and/or GPS-enabled smartphone apps are that they provide high-resolution data in time and space; they do not depend on respondents’ memory, thus providing more accurate data; and they reduce the burden on participants as the data collection is less dependent on the respondents. However, such data lack respondents’ background information such as socio-demographics, or sentiments about certain subjects. Therefore, GPS tracking is usually accompanied by online and/or paper surveys.
Current data-driven tourism studies focus on experiences and flows of tourists in a variety of settings such as touristic visitors in focal points within cities (i.e., ports, heritage districts, city centers) [7,8,9,10,11], visitors of recreational parks and zoos [12,13,14], and visitors of events [2,3,15,16,17,18,19]. By using the newly available datasets derived from ICT tools, these studies investigate visitors’ perception of space and, also their behavioral patterns in time and space and the factors influencing these patterns such as socio-demographics characteristics of visitors (i.e., age, gender), spatial characteristics of visit location (i.e., origin of visit, location and centrality of attractions, accessibility of attractions) and time characteristics of the visit (i.e., starting time of visit, time at attractions). For instance, De Cantis et al. (2016) [9] state that visitors’ age, gender, travel company and visitation frequency (being first- or second-time visitor) influence their visit patterns in port areas and therefore these characteristics can be used to segment visitors. A recent study from Gong et al. (2020) [19] focuses on the behavior of visitors of the Sail event and King’s day in Amsterdam by using location-based social media data. This study shows that visitors differed in terms of their age and gender for their social media uploads per attraction. Moreover, Birenboim et al. (2013) [12] state that visitors’ temporal patterns in theme parks are influenced by their time budget and also the park’s controlled environment (i.e., opening hours and show schedules). Furthermore, Shoval et al. (2011) [7], Aranburu et al. (2016) [10], and Sugimoto et al. (2019) [11] show that due to distance decay, visitors’ movements are largely limited by the starting location of their visit and the spatial configuration of attractions play a role in the choice of visits to intra-destinations.
These studies have implemented various techniques in order to detect and visualize movement patterns from location-based datasets such as grid-based aggregation [7,8,9], density-based clustering [19] and network analysis [3,10,11]. Grid-based aggregation and density estimation are usually used to identify the points of interest (POI)/area of interest (AOI) and network analysis are used to identify the relations between POIs/AOIs. The results of these studies contribute to policy formulations for destination planning and management, event impact management and transportation planning in touristic places.
Hitherto, most of the current studies on understanding large-scale events with newly available datasets [2,15,16,17] focus on subjective experiences of visitors and do not consider visitor flows during the event. Only few studies [3,18,19] highlight the visitor’s spatial and temporal behavior in the large-scale cultural event setting by using Bluetooth, mobile network data and location-based social media data, respectively. This shows that there is a need for more studies on the large-scale cultural events in terms of understanding the visitors’ flows (visitor’s spatial and temporal behavior, intra-event destinations and their relations, and the factors influencing the intra-event destination choices) [18,20,21]. Moreover, the data collection of these studies [3,18,19] did not aim specifically at collecting data from event visitors, and therefore their data collection methods suggest more opportunistic approaches [22] such as scraping data from social media, rather than interacting with the visitors. This current study contributes to the existing studies on visitor’s flows during large-scale events in terms of its GPS data collection methodology and analysis.
In this study, the aims are two-fold: (i) to understand the spatial and temporal behavior of visitors during the event, including the relations between intra-event destinations, and (ii) to understand the determinants of visitors’ intra-event destination choices. For the first aim, we used the GPS data of 281 visitors in order to identify visitors’ intra-event destinations, which refer to the areas of interest (AOIs). These AOI locations are determined based on places where visitors spend a certain amount of time (i.e., longer than 3 min) within a 100 m radius and how much the location is frequented by visitors. Then, we looked at the distribution of these AOIs in the city and how much time visitors have spent on average at these AOIs. Next, we applied network analysis in order to understand the relations between the visitations of each AOI. For the second aim, we combined the GPS data of visitors with their socio-demographics and applied bivariate analysis and cluster analysis.
This study is conducted within the framework of the European Union Horizon 2020 ROCK (regeneration and optimization of cultural heritage in creative and knowledge cities) project which aims to develop an innovative, collaborative and circular systemic approach for the regeneration and adaptive reuse of historic city centers. In this project, large-scale events are exploited as one of the enablers of sustainable urban transformation.
This paper is organized as follows: First, the case study area, data collection procedure and sample characteristics are explained. Then, the methodologies that are used to analyze the data are introduced. After that, the findings of the study are explicated. The paper concludes with the discussion of findings and the effectiveness of the methodologies for understanding visitor flows at large-scale cultural events, and with suggestions for event organizers and policy makers.

2. Materials and Methods

For this study, data collection was done in the course of a large-scale cultural event by means of GPS tracking and surveys. This section will firstly introduce the case study and its area. Then, it will describe the data collection procedure and the sample characteristics. Finally, the methods that were used for data processing and analysis will be explained.

2.1. Study Area

The case study of this research is the Dutch Design Week (DDW) event in 2017 in Eindhoven, the Netherlands. Eindhoven has a population of about 225,000 residents and is located in the south of the Netherlands. DDW is an annual event and it was conducted for the 17th time in 2017. It started on 21 October and lasted for 9 days with exhibitions, workshops, seminars and parties at approximately 80 different venues in the city. The event required the visitors to possess a ticket. The design works of 2500 designers were exhibited and approximately 300,000 people visited the exhibitions [23]. The venues were places both indoors (i.e., institutional buildings, private café and restaurants) and outdoors, and were distributed over three areas in the city, namely the Center area, Strijp-S area and East area. Figure 1 shows the exhibition locations within the three areas in Eindhoven. In terms of exhibition contents of areas, the Center area focuses on more traditional design products, Strijp-S is a more innovative and industrial design focused area and the East area is the new alternative design location of Eindhoven.
DDW is organized in order to communicate the innovative outcomes of the city’s significant companies (i.e., Philips, DAF, ASML) and institutes (i.e., Eindhoven University of Technology, Design Academy), as well as to increase collaboration between them. This event has an important role in Eindhoven’s branding as the city’s goal is to lead the digital industry and become the design capital.

2.2. Data Collection Procedure & Sample Description

The data were collected during four different days of the event in October 2017. Respondents were approached next to the ticket office, which was located near the central train station. This location was chosen since it was the main entrance point to the city and the event for many visitors. Respondents were recruited starting from 9:00 AM. In order to collect data on event visitors’ characteristics and their spatial behavior, we applied a mixed approach of using GPS devices and questionnaires. Respondents were given a GPS logging device, which enabled recording visitors’ routes every 3 s.
Before the experiment, the participants were first asked to fill in a questionnaire about their socio-demographic background, and their familiarity with the event and familiarity with the city. Then, they were asked to carry a GPS device and fill in a second questionnaire about their subjective experiences during their visits at the event. In this study, only the first survey on the visitor characteristics and the logs from GPS devices are used. In another article [2], we used the data related to subjective experiences of visitors.
A total of 317 respondents returned GPS devices but after cleaning the data, GPS logs of 281 respondents were found to be useful for this study. A total of 69 respondents were registeredon 21 October 2017, the first day of the event, 56 respondents on 24 October 2017, 68 respondents on 26 October 2017 and 88 respondents were registered on 28 October 2017.
Table 1 shows the sample characteristics of respondents. The majority of the sample was female and younger than 30 years old, had a travel company (i.e., partner, children, friends or colleagues), and was familiar with Eindhoven. In total, 53% of respondents indicated to combine their visit with other activities; 56% of the respondents have never visited DDW event before; 40% of the respondents intended to spend less than 5 h at DDW; 56% of the sample visited DDW during the weekend; finally, 41% of respondents arrived at the event before 11 o’clock, 32% arrived between 11 and 13 o’clock and 27% arrived after 13 o’clock.

2.3. Data Processing and Analysis Methods

GPS data were processed by the Trace Annotator algorithm which was developed by the Urban Systems and Real Estate Unit of Eindhoven University of Technology [24,25,26,27]. Trace Annotator translates the GPS data of individuals into activity-travel diaries through machine learning algorithms. It mainly involves a segmentation module to split GPS traces into activities and trips, and recognition modules to classify transportation modes and activity types. A Bayesian belief network was used to differentiate transportation modes based on the extracted indicators related to speed, acceleration, measurement accuracy of GPS and the spatial contexts such as distance to road. A visit activity is identified according to the time interval of three minutes between consecutive GPS logs. The location of an activity is determined based on the end time and the frequency of GPS points that appear within a diameter of 100 m. Based on the coordinates of an activity location, the algorithm connects the GPS points sequentially and matches to land use, point of interest data and transportation network data derived from Open Street Map (OpenStreetMap data version 2017, OpenStreet Map Foundation, Cambridge, UK). For this, the algorithm first searches the possible road segments around a GPS point and then identifies the most probable one. After that, the algorithm determines the transportation modes, and matches the chosen route to the transportation networks.
The final product which is the activity-travel diary, provides information on a person’s origin and destination, duration at visited AOIs, transportation modes between the AOIs. The algorithm has been used and tested in different projects and for different studies, such as [28]. An example of a GPS Track for one visitor and its annotation by TA can be found in Figure A1 in the Appendix A.
Based on the activity-travel diaries, firstly, day of the week for the visit, start time of the visit, the most frequented AOIs and AOI’s locations, visitors’ duration at AOIs, and visitors’ time of arrival to each visited AOIs were extracted. In addition to the experiment data, weather data (KNMI, the Royal Netherlands Meteorological Institute, De Bilt, The Netherlands) from a secondary source were collected. Temperature and the occurrence of rain data, which are available at hourly ranges, were matched with the arrival time to each visited AOIs. Weather data were added to this study since they were found to be influential on visitors’ location choice in urbanized areas [29,30]. Finally, these data were matched with the visitor characteristics.

2.3.1. Spatial and Temporal Behavior of Visitors

For understanding the spatial and temporal behavior of visitors, firstly the GPS logs were visualized in 100 m hexagons. This was done to understand where the GPS logs are clustered and whether these locations represent the output of Trace Annotator. In this study, based on the results of Trace Annotator outputs, 17 AOIs were considered since these were the most frequented ones (only the AOIs that were frequented by more than 25 visitors, were considered in this study in order to enable statistically significant results). Then, the average durations per AOI were calculated and represented on a map.
After that, in order to understand the relations between AOIs, a network analysis was performed on the origin-destination and intra-event destinations of each visitor. Network analysis, which is derived from graph theory, attempts to describe the relationships between given nodes. In the network analysis, a network is mainly composed of a set of nodes and links (formally called edges). It calculates the degree of centrality of individual nodes based upon their positioning within the network structure and measures their degree of connectedness depending on their links with each other, which contributes to the better understanding of the entire network [31]. In this study, nodes represent the origin of the trip, intra-event destinations (AOIs) and the final destination of the trip within the network and the edges represent the connections between the nodes. Thus, a network analysis can be used to examine the relationships between spatial entities.
In this study, from the outputs of Trace Annotator, an origin-destination matrix was produced and used for the network analysis. The nodes were defined as the visited AOIs of each DDW visitor, and the links represented the visitors’ movements between the AOIs. In network analysis, it was considered that there is a relationship between two AOIs if a visitor went to both of them. In this study, the network of AOIs was applied as directed and weighted, and the results gave the measures for the centrality of AOIs.
One of the main applications of network analysis is the identification of central nodes in the network [32]. The most prominent nodes occupy central locations within the network. For network analysis, the most common four forms of centrality are identified [33,34] as degree, betweenness, closeness and eigenvector centrality. The measures of centrality quantify the importance of nodes. The identification of central nodes and the relation between them allow us to understand the importance of the nodes and the connectivity between different nodes.
Degree centrality measures the centrality of a node regarding the amount of direct connections to this node. The higher the degree, the higher the centrality of the node is. This usually reveals whether a node is a focal destination such as origin, core or terminating destination of a route [30]. Betweenness centrality measures the number of times a particular node lies on the shortest path between various other nodes in the set of nodes [35]. This indicator represents the ability of a given node to bridge interaction between pairs of other nodes in the network. For a large-scale event, high betweenness centrality of an AOI means that the AOI is a significant intermediary between pairs of other AOIs, because many visitors will stop at that AOI between visitations of other AOIs. Closeness centrality scores the closeness of a node to other nodes in the network, not only to the immediate neighbors [36], by including both direct and indirect links to the node. It calculates the shortest paths among all nodes and assigns each node a score depending upon its sum of shortest paths. The highest possible closeness centrality score is equal to 1, which indicates that a node is directly connected to every other node within the network [37]. For a large-scale event, high closeness centrality of an AOI means that AOI is reachable and close in distance amongst other AOIs. In addition to these, eigenvector centrality is calculated. Eigenvector centrality measures the importance of a node in a network by considering how well connected a node is and how many links their connections have. This calculation relies on the eigenvector centrality of the other nodes in the network that a node has receiving links with [38]. The eigenvector centrality measure has a range between 0 and 1, where 1 refers to a highly important node. For a large-scale event, high eigenvector centrality means that an AOI is important and well connected with other important AOIs (with high eigenvector values). However, it does not necessarily mean that this AOI is frequented many times. For this study, network analysis and visualization were carried out in Gephi software version 0.9.2.

2.3.2. Determinants of Intra-Event Destination Choices

Firstly, we looked into each AOI and investigated whether visitor characteristics, day of the week, start time of the visit, duration at AOIs, arrival time to AOIs, temperature and occurrence of rain at the time of visiting AOI influence visitors’ choices of AOI. In order to do so, bivariate analysis was conducted, namely Pearson chi-square.
After that, K-means clustering analysis was performed in order to find out whether there were clusters among the visitors for their AOI choices. The K-means clustering method is an unsupervised machine learning algorithm that aggregates data points which have certain similarities and uses iterative refinement to produce a final result [39,40]. The algorithm inputs are the number of clusters Κ and the data set. The data set identifies for each visitor whether each AOI was visited. The algorithm starts with initial estimates for the Κ centroids. The algorithm then iterates between two steps. In the first step, each data point is assigned to its nearest centroid, based on the squared Euclidean distance. When all the data points are assigned to a cluster, the first step ends. In the second step, the centroids are recomputed. This is done by taking the mean of all data points assigned to that centroid′s cluster. The algorithm iterates between steps one and two until the algorithm converges to a result. In this study, bivariate analysis was done between the found AOI clusters and visitor characteristics in order to investigate the differences between visitors that belong to different clusters. All analysis of this section was performed via SPSS Statistics 25 software package.

3. Results

This section will firstly introduce the results of spatial and temporal behavior of visitors, including the network analysis findings. Then, the results for the determinants of intra-event destination (AOI) choices will be given.

3.1. Results of Spatial and Temporal Behavior of Visitors

In order to visualize the distribution of GPS logs, the case area was divided into 100 m hexagons. Figure 2 shows the distribution of GPS logs in space. According to the outputs of the Trace Annotator algorithm, the most frequented areas of interest (AOIs) were calculated. Table 2 represents the most visited AOIs by the visitors of the sample of this study, indicating the percentage of visitors and the mean duration of visits at each AOI. Moreover, Figure 3 represents the same information spatially. All the AOIs correspond to one or a cluster of exhibition locations.
It is important to note that the participants were recruited at the Central Station (C1) and most of the participants also brought the GPS loggers back to this location. This explains the high number of visits and visitors for the “Central Station” AOI. Moreover, it is seen that all AOIs were located only in Central and Strijp-S areas, meaning that there was no AOI in the East area.
In Figure 3, it is seen that the most frequented AOIs were Central Station (C1) and Design Academy (C2), followed by Apparaten Fabriek (S1), Machinekamer (S2), Beukenlaan (S3) and Market Square (C3). Moreover, the average duration of the visit was the longest for the Design Academy (C2) and this is followed by Piet Hein Eik (S5), Beukenlaan (S3), Machinekamer (S2) and Temporary Art Center (C7), while 18 Septemberplein (C4), Central Station (C1) and Philips Museum (C11) were the least time spent locations. For the ease of reading, only the code of the AOI names will be mentioned from here on.

Network Analysis: Intra-Event Destinations and Their Relations

The centrality indicators resulting from the network analysis can be seen in Table 3. Regarding degree centrality, C1 has the highest degree, as expected. Since it was the origin of all visitors and final destination of the majority of visitors. This is followed by C2, C3, C5, S2 and S1. These AOIs can be considered as the high attraction points for the visitors. Looking at the betweenness centrality amongst all AOIs, again C1 has the highest value and this is followed by C3 and C2 with high scores (>8.8). This means these AOIs were significant intermediary locations between pairs of other AOIs, because many visitors might have stopped at C1, C2 and C3 between their visitations of other AOIs. Considering closeness centrality, all AOIs have a high closeness centrality value (>0.6). This means that the majority of AOIs were reachable and in close distance from other AOIs. C1, C2, C4, C5, C3 and S3 have the highest scores, respectively, which signify that they have the shortest distances to all other nodes. The closeness indices above 0.6 might also indicate that the connections between AOIs in terms of mobility options provided were convenient. Finally, looking at the eigenvector centrality, again all AOIs perform above 0.5. The high scores for AOIs C1, C3, C2, S1, S2, C5 and S4 indicate that they were significant AOIs and also were well connected with other significant AOIs. An interesting finding is that, although S4 has relatively low scores for degree, betweenness and closeness centrality measures compared to the majority of other nodes in the network, its eigenvector centrality score is high. This might mean that S4 was not an interesting location for visitors but it received direct links (visitors) from important AOIs such as C1, C2 and S1. An explanation for this could be the nearby train station of Strijp-S and the DDW bus stop.
A directed network of visitor flows (in-strength), constructed based on the origin-destination matrix, is illustrated in Figure 4. The size of the AOIs is proportional to the degree of centrality measurement. The color of AOIs represents the betweenness centrality value (the darker the color, the higher betweenness centrality) and the color of the links represents the weight of the link (the darker the color, the higher the weight of a link). The directed network shows that, in the central area, C1, C2 and C3 were well connected AOIs. After being at C1, the majority of visitors went to C2, and the rest visited mainly either C3, C4 or other AOIs in the city center. Moreover, the majority of visitors entered the Strijp-S area at S1, coming mainly directly from C1 and then visited the other AOIs in the Strijp-S area. After their visits to AOIs in the Strijp-S area, most of the visitors returned back to C1.
According to the results of this section, during DDW, C1 was an important node as expected since it was the starting point (origin) for the visitors in our sample. Moreover, it is seen that C2 was an important AOI due to its high centrality indicators. Moreover, the high average duration spent at this node indicates that C2 was the most attractive event location for the visitors. In addition to this, looking at the centrality indicators and average duration spent at the AOIs, C3 was also an important and attractive event location. Moreover, C5 has high centrality indicators; however, the average duration for that AOI was not as high as C2 and C3.
Since all these AOIs are located in the central area, it is also useful to look into the AOIs in the Strijp-S area separately. Amongst the AOIs within the Strijp-S area, S1, S2 and S3 have the highest centrality indicators, suggesting that these AOIs were significant and connected ones within the area. In addition, the average time spent at these AOIs was similar, suggesting that these AOIs were the most attractive ones within the Strijp-S area during the DDW. Finally, it can be said that although S4 was not an attractive AOI, it received direct visits from important and interesting nodes (high eigenvector centrality); therefore, it can be considered as an important AOI in the Strijp-S area.

3.2. Results for the Determinants of Intra-Event Destination (AOI) Choices

After determining the AOIs, the influence of visitors’ characteristics and the AOI-specific characteristics on the visitors’ choice of AOIs was investigated. C1 (central station) was removed from the analysis since it was the origin of the trip and not an intra-event destination. The data and results can be seen in Table A1 in Appendix A.
According to the results, age of visitors shows a significant result at the 10% significance level (X2 (NDF = 15, n = 1120) = chi-square 23.350, p = 0.077), meaning that there were significant differences between the choice of AOIs for different age groups. The results show that C7, C9 and S4 were preferred more by visitors below 30 years old, while S5 was preferred by visitors older than 30 years old. This might be related to the content of exhibition within this AOI and also the atmosphere of the area related to the services around. Moreover, there is a significant association between the intended duration of the event visit and the choice of AOI, at 10% level (X2 (NDF = 15, n = 1120) = chi-square 22.606, p = 0.093). People who intended to visit the event more than 5 h preferred to include mostly C7 and C9 to their visits. In terms of distance, AOIs C7 and C9 are relatively further from the city center and the origin of the visit (C1). Thus, it can be said that visitors who had more time for DDW visitation preferred to include further locations to their itinerary.
In terms of AOI-specific characteristics, arrival time to each AOI shows significant association with the choice of AOI (X2 (NDF = 15, n = 1120) = chi-square 39.178, p = 0.001). The results indicate that most of the visitors preferred to visit the AOIs in the central area before 13:00. Moreover, the duration at AOI has a significant relationship with the choice of AOI (X2 (NDF = 15, n = 1120) = chi-square 184.092, p < 0.001). Especially at C2, C7, S3 and S5, most of the visitors tended to spend more than 45 min. These AOIs included several exhibitions which were represented in large spaces. This might have caused the longer time spent at these AOIs. Finally, it is found that occurrence of rain at arrival time to AOI shows a significant relationship with the choice of AOI, at 10% level (X2 (NDF = 15, n = 1120) = chi-square 22.604, p = 0.093). When there was rain, C2, S2, S3 and S4 were the most preferred AOIs. This might be because C2 included several exhibitions in a large and closed space. S2, S3 and S4 were similar in that sense and, in addition, these AOIs contain several eating and drinking services such as cafes and restaurants.
These results denote that intra-event destination (AOI) choices of DDW visitors depended on the visitors’ age, their intended duration for their visit and AOI-specific characteristics, namely, arrival time to AOI, duration at AOI and the occurrence of rain at the arrival time to AOI. It is found that the association was highly significant between AOI choice and AOI-specific characteristics, especially for temporal aspects. The reasoning behind these choices might be explained with the characteristics of the exhibitions in these AOIs, and also the spatial characteristics of these AOIs in terms of the services provided and the type and size of exhibition buildings.

Clustering of Intra-Event Destination (AOI) Choices

In order to understand whether there were clusters amongst DDW visitors based on their AOI choices, K-means cluster analysis was performed. The number of clusters was decided to be two after several trials. For two clusters, convergence was achieved at the 8th iteration. The two clusters of AOIs can be seen in Figure 5 and their spatial distribution can be seen in Figure 6a,b. Cluster 1 contains 115 visitors, Cluster 2 contains 166 visitors. An analysis of variance (ANOVA) test was conducted in order to check the differences between the clusters (See Appendix A, Table A2). According to this test, visitors’ choices on visiting C4, C7, C8, C9, C11, C12 did not differ significantly between the clusters (at 10% significance level). As can be seen in Figure 5, Cluster 1 contains visitors that visited mainly the AOIs in the Strijp-S area who also visited some of the AOIs in the Central area, largely C2. Cluster 2 consists of visitors that visited the AOIs mainly within the Central area and rarely combined their visit with the Strijp-s area.
Table 4 shows the results of chi-square analysis between the determined clusters and the visitor characteristics. According to the Pearson chi-square test, there is a significant difference between the clusters in terms of visitors’ arrival time to DDW event. The results show that the majority of the visitors who are in Cluster 1 preferred starting the event activity early (before 11:00 am). It is possible that visitors considered time restrictions for their visit before the event started so that their visit could cover both areas. It is also possible that visitors who arrived early decided to visit both locations considering the spatial organization of the event. Visitors who are in cluster 2 (tended to mainly visit the Central area) did not show a strong preference for the arrival time to DDW.

4. Discussions and Conclusions

Research on visitors’ flow during large-scale events is still limited but highly important for event planning and management, transportation development and impact management. This study contributes to the few existing studies on large-scale events in terms of its data collection with GPS loggers and a survey, and the analysis of the data for understanding the visitor flows and visitors’ intra-event destination choices.
Although the city dedicated three areas for the DDW, only two of them (Central and Strijp-S) were visited enough to be considered to have AOIs. The results indicate that visitors of DDW preferred AOIs in the Central area and Strijp-S (West) area, rather than in the East area of the city. The East area is a new ‘alternative design’ district of the city. Since this area’s concept for design is new, it was less known to DDW visitors compared to the Center and Strijp-S areas. Moreover, the most attractive AOIs, which are C2 and C3, are in the highly central and busy district of the city, close to each other, to the central train station and to other activities and services such as shops, cafes and bars. The same applies to the most attractive AOIs of Strijp-S area which are S1, S2 and S3. Moreover, it is found that the Central area and Strijp-S area are connected to each other, especially by the flow of visitors between C1 to S1. These results show that the high attraction points of the city were again the most significant ones during the DDW event. Moreover, the distance decay factor might have influenced the flows to far locations within the areas. This might also be a reason for the limited attractiveness of the East area. In order to distribute the flows to other less represented locations, exhibition contents and their locations should be reconsidered in the future events. Additionally, the distance decay factor can be eliminated by strengthening the provision of a variety of mobility options (i.e., busses and bikes associated with the event) in many of the AOIs. The lack of spatial dispersal of visitors might also be due to the need for a clearer wayfinding system in terms of maps, roads and transport signs. Improvements in these aspects can support the visitors to find their way and explore different locations of the city during the DDW event. For that purpose, city managers should make an on-site assessment of the current navigation services.
The intra-event destination (AOI) choices were mainly influenced by visitors’ age, visitors’ intended DDW visit duration, arrival time to AOI, duration at AOI and rain occurrence at the arrival time to AOI. Visitors’ age might have created a taste variance based on the content of exhibition at AOIs and the location and atmosphere of AOIs. Additionally, AOI choices of visitors were associated with time constraints. Time-related restrictions (such as starting time of the event) were influential also on the choice of exhibition areas. In order to maximize the time span of visitors and navigate the visitors through different areas based on visitors’ tastes, themed trips of certain durations can be organized. These themed trips can include suggested itineraries for different themes and can be provided as maps and/or brochures at the ticket offices or as a smartphone app service.
This study proves that GPS data together with a survey is a valid approach for future studies on visitor flows at large-scale events. However, the data collection process is a limitation for recruiting larger numbers of respondents since people need to stop at the ticket office to answer the survey questions and be instructed regarding the GPS loggers. In addition, the distribution and collection of GPS loggers at a specific location is another limitation of this study since visitors who start the event visiting from another location might visit different AOIs. Therefore, this approach can be further advanced in future studies by developing a dedicated user-friendly smartphone application. This app can also accommodate questions regarding visitors’ choices for AOIs. Another limitation of the study was that we considered a place an AOI if it was frequented by more than 25 visitors. The reason for that was to conduct bivariate analysis with enough samples of visitors. However, this might have caused bias for the network representation because there might have been other places visited and included in the origin destination matrix. It was also surprising that visitor characteristics (except age and intended duration of visit) were not found to be significant. This might be because the surveyed characteristics were not differentiating or because our sample was homogenous. This should be further examined in a future study.
Overall, this study provided useful insights for event managers and city planners for better organized events. It shows that understanding visitors’ flows at large-scale events can reveal how much of the space is consumed by different visitor profiles, and therefore the level of attraction of different locations in the city. With the suggestions provided in this study, large-scale events such as DDW can increase the potential of exhibitions for more and repeating visitors. It will also contribute to further event planning for different target groups. In the future, this approach can be further extended for modeling scenarios to predict the results of different event interventions for better organized and sustainable events.

Author Contributions

Gamze Dane acquired funding for this research, conceptualized the study, developed the data collection methodology and executed the data processing and analysis. Tao Feng contributed to the data processing. Deniz Ikiz Kaya, contributed to data analysis. Gamze Dane, Aloys Borgers, Deniz Ikiz Kaya and Tao Feng wrote the manuscript. Aloys Borgers, reviewed and provided critical comments for the improvement of the manuscript. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by European Union’s Horizon 2020 research and innovation program under grant agreement No. 730280 as part of the ‘regeneration and optimization of cultural heritage in creative and knowledge cities—ROCK’ project.

Acknowledgments

We want to thank researchers Soheil Derakhshan and Tahsin Ettefagh for their effort during the data collection. We also want to thank Dutch Design Week organization and the municipality of Eindhoven for providing us the stage for data collection and discussing the results with us.

Conflicts of Interest

The authors declare no conflict of interest.

Ethical Approval

All subjects gave their informed consent for inclusion before they participated in the study.

Appendix A

Figure A1. (a) GPS track of one visitor; (b) Trace Annotator output of the GPS track of one visitor
Figure A1. (a) GPS track of one visitor; (b) Trace Annotator output of the GPS track of one visitor
Ijgi 09 00661 g0a1
Table A1. Results of the chi-square test between AOIs and visitor-specific and AOI-specific variables.
Table A1. Results of the chi-square test between AOIs and visitor-specific and AOI-specific variables.
VariableLevelsC2C3C4C5C6C7C8C9C10C11C12S1S2S3S4S5Pearson Chi-Square
ValueDfAsymptotic Significance (2-Sided)
Visitor-specific variablesGenderFemale15159615127242220251313686552302117.009150.318
Male8036272315121410715134540441918
Age≤30 years old16869655228292225191817817359381923.350150.077
>30 years old63262322147145131093232371120
Combining Other ActivitiesYes11151383219211814211311604638261614.699150.473
No120445042231518161115155359582323
Travel CompanyAlone1044233341715171211119443248131617.266150.303
With other(s)127535540252119182117176973483623
Familiarity with EindhovenNot at all88403236201213912131241383520139.348150.859
Familiar143555638222423212015147267612926
Familiarity with DDWNever visited13367494729161912191517666053312318.139150.255
One or more times visited9828392713201718131394745431816
Intended Duration of Visit≤5 h8529422721611813136434336151522.606150.093
>5 h146664647213025221915207062603424
Day of VisitWeekday96364333271313149139404142251719.962150.173
Weekend135594541152323162315177364542422
Arrival Time to the EventBefore 11:0010151333615191915191114606457312335.372300.229
11:00 to 13:00762736231713111161163125251211
After 13:00541719151046476622161465
AOI-specific variablesArrival Time to the AOIBefore 13:001474547452616211514169513945191839.178150.001
After 13:0084504129162015151812176266513021
Duration at AOI≤45 min84718162361525162125227354453812184.092150.000
>45 min14724712621111411344051511126
Occurrence of Rain No15361454927232419271714775752282322.604150.093
Yes7834432515131211511123648442116
Temperature≤13.0 C813631211310109127937382817721.750300.863
13.1 to 16.0 C913440262115141391393938371919
>16.0 C5925172781112811883729311313
Table A2. ANOVA analysis of final cluster centers.
Table A2. ANOVA analysis of final cluster centers.
AOIClusterFSignificance
Mean Squaredf
C215.8401100.8090.000
C31.29416.2700.013
C40.39011.9020.169
C50.68613.7660.053
C61.794115.7410.000
C70.19911.8230.178
C80.07910.7260.395
C90.02410.2500.617
C100.26912.8330.093
C110.04010.4690.494
C120.15411.8960.170
S129.1881244.0630.000
S215.403192.4690.000
S322.6351172.2890.000
S44.434134.9790.000
S52.901126.3780.000

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Figure 1. Location of exhibitions and areas [2].
Figure 1. Location of exhibitions and areas [2].
Ijgi 09 00661 g001
Figure 2. Distribution of GPS logs in 100 m hexagons and the location of DDW exhibitions.
Figure 2. Distribution of GPS logs in 100 m hexagons and the location of DDW exhibitions.
Ijgi 09 00661 g002
Figure 3. Average duration of visitors in minutes at each AOI. Note: The size of AOIs is proportional to the number of visits (the larger an AOI is represented, the more frequented it was).
Figure 3. Average duration of visitors in minutes at each AOI. Note: The size of AOIs is proportional to the number of visits (the larger an AOI is represented, the more frequented it was).
Ijgi 09 00661 g003
Figure 4. Directed network of visitor flows.
Figure 4. Directed network of visitor flows.
Ijgi 09 00661 g004
Figure 5. Distribution of AOI visits per clusters.
Figure 5. Distribution of AOI visits per clusters.
Ijgi 09 00661 g005
Figure 6. Spatial distribution of AOI visits per clusters: (a) Cluster 1, (b) Cluster 2.
Figure 6. Spatial distribution of AOI visits per clusters: (a) Cluster 1, (b) Cluster 2.
Ijgi 09 00661 g006
Table 1. Sample characteristics (n = 281).
Table 1. Sample characteristics (n = 281).
VariableLevelsFrequencyPercentage
Genderfemale17562
male10638
Age≤30 years old20172
>30 years old8028
Combining other activitiesyes14853
no13347
Travel companyalone11942
with other(s)16258
Familiarity with Eindhovennot at all10136
familiar18064
Familiarity with DDWnever visited15756
one or more times visited12444
Intended duration of visit≤5 h11240
>5 h16960
Day of visitweekday12444
weekend15756
Arrival timebefore 11:0011541
11:00 to 13:009132
after 13:007527
Table 2. Visitation frequency and average time spent at areas of interest (AOIs).
Table 2. Visitation frequency and average time spent at areas of interest (AOIs).
AOI NameCodeArea% of VisitsAverage DurationStandard Deviation of Duration
Central StationC1Central33%2055.17
Design AcademyC2Central14%7658.48
Market SquareC3Central6%3437.70
18 SeptemberpleinC4Central5%1816.96
Rembrandt BioscoopC5Central4%2630.99
Café AC6Central3%2951.59
Temporary Art CentreC7Central2%5941.92
Het Klein TheaterC8Central2%5048.24
Van Abbe MuseumC9Central2%5130.51
PopocatepetlC10Central2%4041.53
Philips MuseumC11Central2%2539.70
StadhuispleinC12Central2%2619.36
Apparaten FabriekS1Strijp-S7%5466.41
MachinekamerS2Strijp-S6%6056.41
BeukenlaanS3Strijp-S6%6651.09
KlokgebouwS4Strijp-S3%3635.91
Piet Hein EikS5Strijp-S2%7148.64
Table 3. Results of centrality indicators of network analysis.
Table 3. Results of centrality indicators of network analysis.
AOI CodeDegreeBetweennessClosenessEigenvector
C13410.9081.0001.000
C2338.8651.0000.935
C3319.3310.8421.000
C4264.9040.8890.738
C5295.7530.8890.838
C6191.3230.7270.553
C7191.2280.7270.579
C8212.4210.7270.683
C9223.1240.8420.559
C10232.3820.7620.653
C11202.6780.8000.535
C12191.9140.7270.550
S1273.6900.7620.902
S2285.2360.8000.882
S3265.3210.8420.728
S4221.5470.6400.815
S5191.3760.6670.672
Table 4. Results of the chi-square test between clusters and visitor characteristics (within cluster percentages of the number of visitors are in brackets).
Table 4. Results of the chi-square test between clusters and visitor characteristics (within cluster percentages of the number of visitors are in brackets).
VariablesLevelsCluster 1Cluster 2Pearson Chi-Square
ValuedfAsymptotic Significance (2-sided)
GenderFemale69 (60.0%)106 (63.9%)0.43010.512
Male46 (40.0%)60 (36.1%)
Age≤30 years old79 (68.7%)122 (73.5%)0.76810.381
>30 years old36 (31.3%)44 (26.5%)
Combining Other ActivitiesYes58 (50.4%)90 (54.2%)0.39010.532
No57 (42.9%)76 (45.8%)
Travel CompanyAlone46 (40.0%)73(44.0%)0.44010.507
With other(s)69 (60.0%)93 (56.0%)
Familiarity with EindhovenNot at all41 (35.7%)60 (36.1%)0.00710.933
Familiar74 (64.3%)106 (63.9%)
Familiarity with DDWNever visited63 (54.8%)94 (56.6%)0.09410.760
One or more times visited52 (45.2%)72 (43.4%)
Intended Duration of Visit≤5 h45 (38.6%)67 (40.4%)0.08810.767
>5 h70 (61.4%)99 (59.6%)
Day of VisitWeekday48 (41.7%)76 (45.8%)0.45110.502
Weekend67 (42.7%)90 (54.2%)
Arrival TimeBefore 11:0061 (53.0%)54 (32.5%)12.40310.002
11:00 to 13:0032 (27.8%)59 (35.5%)
After 13:0022 (19.1%)53 (31.9%)
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Dane, G.; Borgers, A.; Kaya, D.I.; Feng, T. Visitor Flows at a Large-Scale Cultural Event: GPS Tracking at Dutch Design Week. ISPRS Int. J. Geo-Inf. 2020, 9, 661. https://0-doi-org.brum.beds.ac.uk/10.3390/ijgi9110661

AMA Style

Dane G, Borgers A, Kaya DI, Feng T. Visitor Flows at a Large-Scale Cultural Event: GPS Tracking at Dutch Design Week. ISPRS International Journal of Geo-Information. 2020; 9(11):661. https://0-doi-org.brum.beds.ac.uk/10.3390/ijgi9110661

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Dane, Gamze, Aloys Borgers, Deniz Ikiz Kaya, and Tao Feng. 2020. "Visitor Flows at a Large-Scale Cultural Event: GPS Tracking at Dutch Design Week" ISPRS International Journal of Geo-Information 9, no. 11: 661. https://0-doi-org.brum.beds.ac.uk/10.3390/ijgi9110661

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