Fig. 9
From: A new approach to the space–time analysis of big data: application to subway traffic data in Seoul
The fourth mode of CSEOF representing the weekly patterns of passengers for Subway Line #2: a hourly and total number of boarding passengers at each of the 50 subway stations numbered from 201 to 250; b hourly and total number of alighting passengers; c number of boarding (red) and alighting passengers in all stations; and d corresponding amplitude time series. There are two major clusters and several distinct locations such as Station 239 and stations nearby Station 220 are surfaced in this mode throughout the week