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Characterizing change in vegetation cover
The approach here is rather more classic: it is about describing the vegetation
cover at two dates t1 and t2 at least, from compatible satellite images, and then to
characterize any change at each point. From an operational point of view, the images
are processed in the raster mode, and it concerns, therefore, a “pseudo-field”
approach (a pixel in the strict sense is a fixed object), the granularity of the
observation corresponding to the pixel of the image. The superposition of
the information corresponding to the two dates allows identifying the portions of
space where the vegetation cover has changed in a similar way, toward an
improvement (densification) or a deterioration (weakening) of the vegetation cover.
Figure 2.11. Identifying the movements and “stations” in a trajectory
Figure 2.12. Construction of “places of frequentation” (from [BUA13]). For a color
version of the figure, see www.iste.co.uk/mathian/spatiotemporal.zip
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