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Fig. 4 An air quality visualization technique
Fig. 5 Description of the
output rendering of an
air quality visualization
As previously seen, the tasks can be organized in high-level tasks composed
of low-level tasks (Lee et al. 2006 ). The urban tasks performed by the users can
be considered as high-level tasks. Performing them implies navigation tasks or
access-to-data tasks in the 3D model (visual tasks). Thus, the user task Analysis of
pedestrian behaviour implies retrieving the highest (or lowest values) of a repre-
sentation of integer type. In order to determine precisely the access-to-data tasks,
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