Geo Single Trajectory Creator

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Description

This processor creates a JTS LineString geometry from JTS Points events, represent a trajectory. A trajectory is defined as the path that a moving object follows through space as a function of time. Each sub-point of this LineString represents a single event. The latest sub-point represents the latest geo-event. For each Point event it is also possible to store an additional m-value representing for example actually speed, distance, duration or direction of this event. A trajectory consists of at least two sub-point and can't be infinitive, so a threshold of maximum allowed sub-points is required. When the sub-point threshold is exceeded, the oldest point is removed from the LineString.

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Required inputs

• WKT String of a JTS Point Geometry
• Integer value representing EPSG code
• Number value for M-value

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Configuration

Creates a JTS Geometry LineString from a JTS Point Geometries events representing a trajectory.

1st parameter

Point WKT String

2nd parameter

EPSG code value

3rd parameter

M-value for each sub-point of the trajectory

4rd parameter

String for a description text for the trajectory

5rd parameter

Number of allowed sub-points

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Output

Adds a LineString geometry in the Well Known Text to the event, representing a trajectory. Also the description text is added to the event stream. The first existing event creates an empty LineString.

Example

Creating a LineString with a threshold of 2 allowed sub-points:

• First Event:
  • Point(8.12 41.23) --> LineString(empty)
• Second Event:
  • Point(8.56 41.25) --> LineString(8.12 41.23, 8.56 41.25)
• Second Event:
  • Point(8.84 40.98) --> LineString(8.56 41.25, 8.84 40.98)

M-value is not represented in the LineString but will be stored for internal use!