Shifting Granularity over Geospatial Lifelines

Kathleen Hornsby

It is often desirable to consider an object’s movement over space and time from the perspective of different levels of detail or granularity. Changing to a more detailed view uncovers information that otherwise is unknown. Conversely, moving to a simpler view can improve our understanding of the movement patterns of an object. This paper considers shifts in granularity over geospatial lifelines. A geospatial lifeline is a time-stamped record of all the locations that an object has occupied over a period of time. An approach to modeling lifelines at different granularities is presented, identifying different aspects of lifelines that are relevant at refined or coarse granularities.

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