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28 Modern Spatiotemporal Geostatistics — Chapter 2
Figure 2.1. The dynamics of an entity in space/time £.
Figure 2.2. (a) The dynamics of the geologic boundary B in space/time £.
(b) Time evolution of contaminant distribution.
of a particle not moving in space is a position-line). A time-surface is a set
of points in E representing a spatial arrangement of events having the same
temporal coordinate with respect to the reference system. Therefore, a time-
surface (sometimes technically called a space-like hypersurface} is not a single
