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movement behaviors, most of which are collective behaviors. The collected
types of behaviors have been organized in an informal taxonomy based on the
spatial and temporal characteristics of the raw trajectories.
Laube et al.
(
2005
) centered their research on studying relative movement
among a set of moving objects. They use a matrix of synchronized raw trajecto-
ries that allows an easy comparison of the movement of an object in time or of
the movements of several objects at some instant. They analyze the variability
of characteristics of the moving objects to characterize a number of behaviors as
either individual or collective behaviors. They use the complex behavior concept
(as a composition of basic behaviors) in the same way we used it in this chapter.
Wood and Galton
(
2009
)and
Wood and Galton
(
2010
) develop a deeper
investigation into concepts for collective behaviors. Their ontological approach
develops some fundamental questions about definition and properties of groups.
These questions are still open for research.
