Understanding Topological and Spatial Attributes of Bus Transportation Networks in Cities of Chongqing and Chengdu

Figure 9

Diagrams of curve fitting of BTN-CQ and BTN-CD. (a1) BTN-CQ with “noise points” being included in linear coordinate system; (a2) BTN-CD with “noise points” being included in linear coordinate system; (b1) BTN-CQ with “noise points” being excluded in linear coordinate system; (b2) BTN-CD with “noise points” being excluded in linear coordinate system; (c1) BTN-CQ with “noise points” being excluded in log-log coordinate system; (c2) BTN-CD with “noise points” being excluded in log-log coordinate system; (d1) BTN-CQ with “noise points” being excluded in log-linear coordinate system; (d2) BTN-CD with “noise points” being excluded in log-linear coordinate system. In Figures 9(c1) and 9(c2), “noise points” are shown in the diagrams but not included in the data fitting procedure. In this way, the graphs obviously presented the effect of the “noise points” in the curve fitting process, implying that there might be different statistical mechanics between the “noise points” part and the main part of BTNs.