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CSE 594: Spatial Data Science &

Engineering

Overview of Moving Object Data

Trajectory of

Moving Objects

A type of spatiotemporal data generated by moving objects

A trajectory is a polyline in three-dimensional space

Two dimensions refer to the space and the third dimension

refers to the time

Represented as a sequence of position points Tr(P1, P2, …, Pn)

Each position point Pi is represented as (lat, lon, t), where

lat and lon are location coordinates and t is the timestamp

Queries on Trajectory Data

Given a dataset, a moving object id, a time range [ts, te], the query returns all the trajectory

line segments of the corresponding object such that all position points Pi of the line segments

have the timestamp value within the given time range

If the object id is not given, return all trajectory line segments satisfying the above constraints

Temporal Query

Given a dataset, a spatial range {latmin, lonmin, latmax, lonmax}, the query returns all trajectory

line segments such that all position points Pi of the line segments are located in the spatial

range

Spatial Range Query

Queries on Trajectory Data

Given a dataset, a spatial range {latmin, lonmin, latmax, lonmax}, and a time range [ts, te], the

query returns all trajectory line segments such that all position points Pi of the line segments

are within the spatial and temporal range

Spatiotemporal Range Query

Given a dataset, a query trajectory q, a distance function, and a distance threshold, the

similarity query returns all trajectories Tri where the distance between q and Tri is not greater

than the given distance threshold.

Similarity Query

Queries on Trajectory Data

Given a dataset, a query trajectory q, a positive integer k, and a distance function, the K-NN

query returns k nearest trajectories of q, where the distance from q to other trajectories is

measured based on the given distance function

K-NN Query

Popular Moving Object Databases

MobilityDB

Secondo

TrajMesa

TrajStore

MovingPandas

Sci-kit mobility

Libraries for Analyzing Moving Objects

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