Geography Reference
In-Depth Information
Egenhofer (2002), are an object of study in the framework of moving objects. Analytical
applications have been discussed by Andrienko
et al.
(2003) and the cartographics by Kraak
and Koussoulakou (2004).
15.3 Basics of the space-time cube
Hagerstand's time geography sees both space and time as inseparable, and this becomes
clear if one studies the graphic representation of his ideas, the space-time cube as displayed
in Figure 15.1. Two of the cubes axes represent space, and the third axis represents time.
This allows the display of trajectories, better known as space-time paths. These paths are
influenced by constraints. One can distinguish between capability constraints (for instance
mode of transport or the need for sleep), coupling constraints (for instance being at work
or at the sports club), and authority constraints (for instance accessibility of buildings or
parks in space and time). On an aggregate level time-geography can also deal with trends
Figure 15.1
The space-time cube in its basic appearance with longitude and latitude along the
x
-
and
y
-axes, and time along the
z
-axes. It shows a base map, a space-time path and two stations, as
well as the footprint of the path. In this example a boat trip is shown. The trip is represented by the
path starting at the bottom of the cube (Lauwersoog) and ending at the top (Schiermonnikoog).
Both harbours appear as stations. The stations stand out as vertical lines from the cube's bottom to
its top
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