 Based on trajectory  big data and the theory of mean-field , we establish an aggregated risk mean = field that contains information of all risk-spreading particles by proposing a spatio-temporal model named HiRES risk map.
<clarity>  Based on trajectory  big data and the theory of mean-field , we establish an aggregated risk mean = field that contains information of all risk-spreading particles by proposing a spatio-temporal model named HiRES risk map.
 Based on trajectory provided by the big data and the theory of mean-field , we establish an aggregated risk mean = field that contains information of all risk-spreading particles by proposing a spatio-temporal model named HiRES risk map.