Database Reference
In-Depth Information
t
t
y
y
x
x
(a)
(b)
t
y
y
x
x
(c) (d)
Figure 2.4 Three different trajectory reconstruction approaches (b, c, d) for a raw data
set (a).
Reconstructing Raw Trajectories
Collected raw data represent spatio-temporal locations (Figure
2.5
a). Apart from
storing these raw data, we are also interested in reconstructing trajectories (Fig-
ure
2.5
b). The so-called
trajectory reconstruction
task is not a straightforward
procedure. Having in mind that raw points arrive in bulk sets, we need a filter
that decides if the new series of data is to be
appended
to an existing trajectory
or not.
The process of algorithm reconstruction needs a method for determining
different trajectories, which should be applied to raw positions. Taking into
consideration that the notion of trajectory cannot be the same in every application
