Similarity.sql File Reference

File containing the implementation of the Trajectory data type. More...

Functions
float8	euclideanstart (trajectory trajectorya, trajectory trajectoryb)
	The function returns the euclidean distance between the first points of the trajectories. More...
float8	euclideanend (trajectory trajectorya, trajectory trajectoryb)
	The function returns the euclidean distance between the last points of the trajectories. More...
float8	euclideanstartend (trajectory trajectorya, trajectory trajectoryb)
	The function returns the average euclidean distance between the first and last points of the trajectories. More...

Detailed Description

File containing the implementation of the Trajectory data type.

Author

Marios Vodas (mvoda.nosp@m.s@gm.nosp@m.ail.c.nosp@m.om).

See also

Trajectory

Trajectory type

Distance functions

Function Documentation

float8 euclideanend	(	trajectory	trajectorya,
		trajectory	trajectoryb
	)

The function returns the euclidean distance between the last points of the trajectories.

Parameters

[in]	trajectoryA	The first trajectory
[in]	trajectoryB	The second trajectory

Returns

distance between the last points of the trajectories

See also

Euclidean distance measure

float8 euclideanstart	(	trajectory	trajectorya,
		trajectory	trajectoryb
	)

The function returns the euclidean distance between the first points of the trajectories.

Parameters

[in]	trajectoryA	The first trajectory
[in]	trajectoryB	The second trajectory
[out]	result	The result

Returns

the distance between the first points of the trajectories

See also

Euclidean distance measure

float8 euclideanstartend	(	trajectory	trajectorya,
		trajectory	trajectoryb
	)

The function returns the average euclidean distance between the first and last points of the trajectories.

Parameters

[in]	trajectoryA	The first trajectory
[in]	trajectoryB	The second trajectory

Returns

the average euclidean distance between the first and last points of the trajectories

See also

Euclidean distance measure