Revealing Taxi Driver's Mobility Intelligence through His Trace

Revealing Taxi Driver's Mobility Intelligence through His Trace

Liang Liu, Clio Andris, Assaf Biderman, Carlo Ratti
DOI: 10.4018/978-1-61520-769-5.ch007
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This study develops a methodology for the analysis of taxi drivers’ operation behavior in a real urban environment. The research objective is to spatially and temporally quantify, visualize, and examine taxi drivers’ operational behavior and skill (as measured by income), which the authors call ‘mobility intelligence’. For the first time, taxi drivers’ different operation strategies were systematically analyzed through their daily activity traces. Routes and economic behavior data were collected with the use of Global Positioning System (GPS) and a set of spatiotemporal analysis tools were developed. Drivers are categorized by their daily income into top drivers and ordinary drivers. A 3D clustering technique is used to quantitatively analyze the spatiotemporal patterns for top driver and ordinary driver. Also, fractal analysis is employed to quantify tortuosity of movement paths and to explore how top and ordinary drivers operate on different spatial scales at different times, where the primary focus is to reveal top driver mobility intelligence.
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In recent years, the deployment of pervasive technologies and their ability to track movement in cities has led to a massive increase in the volume of records of people’s spatial traces. These records serve as digital footprints of individual mobility patterns. Also, geo-located websites and services provide new sources of real-world human activity data. For example, Rattenbury et al. (2007) and Girardin et al. (2008) used geo-tagging patterns of posted photographs in the popular photo hosting website, Flickr, to automatically detect interesting real-world events and draw conclusions about the flow of tourists in a city. In addition, as city-wide urban infrastructure like buses, taxis, subways, public utilities, and roads become digital, these datasets can be used as framework for tracking flows through space and time. Some have capitalized on this technology by using cellular network data to study city dynamics and human mobility (Ratti et al., 2006; Reades et al. 2007; and González et al. 2008). Also McNamara et al. (2008) used data collected from an RFID-enabled subway system to predict co-location patterns amongst mass transit users. These sources of data are ever-expanding and offer large, underexplored opportunities to understand physically-based interactions with the real world.

Recognizing human behavior and understanding a user’s mobility from his digital footprints are critical issues in pervasive computing systems. In this chapter, we introduce a novel methodology to measure taxi drivers’ ability to earn the most profit by their continuous GPS traces and activity (carrying passenger or not). First, we classify the taxi drivers into top drivers and ordinary drivers by calculating their earnings, earnings rank and ‘eigenactivities’; then we compare the spatial-temporal distribution and client frequency of top drivers and ordinary drivers to find why top drivers earn more than ordinary drivers.

It is intuitive that a taxi driver wants to make the most money in the least amount of time. Because of the fare rate system and desire for continuous revenue, a driver hopes to pick up many passengers whose destinations are in places where there are more potential customers for a new pick up, to perpetuate a chaining of constant business. There are several commonsense assumptions about this operation behavior:

  • Assumption 1: Taxi drivers prefer areas with the most potential customers.

  • Assumption 2: A taxi, once occupied by a customer at origin zone, will move to the customer's destination zone via the shortest path. Once a customer ride is completed, the taxi becomes vacant and cruises either in the same zone or goes to other zones to seek its next customer. In doing this, each taxi driver is assumed to attempt to minimize his/her expected search time required to meet the next customer.

Assumption 1 reflects the observed behavior of many taxi drivers to aggregate at railway stations, hotels and other places of interest for visitors. Assumption 2 also follows economic intuition, and is bolstered by other scientific urban taxi services models. (See Wong, K. et al. 2001, 2002, 2005; Wong, S. et al. 1998; and Yang et al., 1998, 2001, 2002, 2005a, 2005b).

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