public double getTripSpeed ( String trip_id , boolean straightLine ) { StopTime firstStopTime = this . stop_times . ceilingEntry ( Fun . t2 ( trip_id , null ) ) . getValue ( ) ; StopTime lastStopTime = this . stop_times . floorEntry ( Fun . t2 ( trip_id , Fun . HI ) ) . getValue ( ) ; // ensure that stopTime returned matches trip id (i.e., that the trip has stoptimes) if ( ! firstStopTime . trip_id . equals ( trip_id ) || ! lastStopTime . trip_id . equals ( trip_id ) ) { return Double . NaN ; } double distance = getTripDistance ( trip_id , straightLine ) ; // trip time (in seconds) int time = lastStopTime . arrival_time - firstStopTime . departure_time ; return distance / time ; // meters per second }
Get trip speed in meters per second .