Package edu.gsu.cs.dmlab.temporal

Class TemporalAligner

java.lang.Object

edu.gsu.cs.dmlab.temporal.TemporalAligner

All Implemented Interfaces:

ITemporalAligner

public class TemporalAligner
extends Object
implements ITemporalAligner

Performs minor adjustments to the timestamp of a spatiotemporal event report to align with an epoch and step size in interpolation methods described in Boubrahimi et. al, 2018.

Author:

Dustin Kempton, Data Mining Lab, Georgia State University

Constructor Summary

Constructors

Constructor	Description
TemporalAligner(IInterpolationFactory factory, org.joda.time.DateTime epoch, org.joda.time.Duration step, RoundingStrategy strategy)	Constructor that provides an epoch that is used to align the timestamp of each event report in passed in trajectories against.

Method Summary

Modifier and Type	Method	Description
ISTInterpolationEvent	alignEventsForInterpolation(ISTInterpolationEvent input)
ISTInterpolationTrajectory	alignEventsForStepFromEpoch(ISTInterpolationTrajectory trajectory)	Takes all of the event reports within the trajectory and aligns them to an integer multiple of some step size starting from some epoch.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TemporalAligner

public TemporalAligner(IInterpolationFactory factory,
                       org.joda.time.DateTime epoch,
                       org.joda.time.Duration step,
                       RoundingStrategy strategy)

Constructor that provides an epoch that is used to align the timestamp of each event report in passed in trajectories against. The alignment forces the timestamps to be an integer multiple number of steps from the input epoch time. The rounding strategy is also provided, it can be UP, DOWN, or ROUND. Where UP always takes the timestamp to the next closest integer multiple, down always takes the timestamp to the previous, and ROUND takes it to the closest integer multiple.

Parameters:

factory - The factory used to create new objects to return

epoch - The epoch time to align against

step - The step to use to force the timestamps to be an integer multiple of

strategy - The rounding strategy

Method Detail

alignEventsForStepFromEpoch

public ISTInterpolationTrajectory alignEventsForStepFromEpoch(ISTInterpolationTrajectory trajectory)

Description copied from interface: ITemporalAligner

Takes all of the event reports within the trajectory and aligns them to an integer multiple of some step size starting from some epoch. The original input data should remain unchanged and new instances of each of the objects that compose the trajectory should be created.

Specified by:

alignEventsForStepFromEpoch in interface ITemporalAligner

Parameters:

trajectory - The input trajectory that will be processed.

Returns:

A new trajectory with each of the internal event reports aligned so that their time stamps are an integer multiple of some step size starting from some epoch.

alignEventsForInterpolation

public ISTInterpolationEvent alignEventsForInterpolation(ISTInterpolationEvent input)

Specified by:

alignEventsForInterpolation in interface ITemporalAligner