Figure 3
Airport classification based on burstiness. (A) Clustering based on the standard deviation (σ) and the mean (μ) of the waiting time between consecutive flights. Examples for each class are shown in the insets–Chengdu Shuangliu Airport for category one, Daqing Saertu Airport for category two and Kuqa Airport for category three. (B) Distribution of airports using a chart based on the GDP of the relevant cities. The center represents Hongqiao Airport and the radius denotes the gap between the GDP of Shanghai (the richest city in China) and other cities. (C) Spatial distribution of airports by category (mainland in China). The map is obtained from OpenStreetMap.org under the Open Data Commons Open Database License (ODbL), and visualized with ArcGIS 10.0 (http://www.esri.com/).
