Research Article

Optimization for the Locations of Ambulances under Two-Stage Life Rescue in the Emergency Medical Service: A Case Study in Shanghai, China

Figure 3

Locations of 8 current ambulance stations and 19447 EMS call origination points in Songjiang; EMS calls are marked as small red dots, and the 8 stations currently used are marked with a black cross. EMS calls from January 1 to December 31, 2013.