Geoscience Reference
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Fig. 2 Description of the
input data of an air quality
visualization technique
The containedIn association may be used to specify that the coverage elements
are all contained in a (not necessarily connected) spatial object.
The same data types (e.g. a scalar field) may represent completely different
information types (e.g. measured temperatures or pollutant concentration in
an urban area). Since different information types are generally used in different
contexts and for different tasks, it is not obvious that a technique suitable for an
information type will also be appropriate for another one (even though they are
represented with the same data type). Therefore it is important to describe not
only the data type but also the information type for which the technique has
been primarily designed. Since the notion of information type is related to some
knowledge of the real world, each information type object is related to WordNet
concepts (WordNet is a lexical ontology and contains all the senses of the English
words) (Miller 1995 ).
Figure 2 shows the data description for a technique intended to display a set of
real numbers that represent pollutant concentrations in 3D regions arranged in a
grid (see Fig. 4 for an illustration of this technique).
3.3 Output Rendering Representation
The information to visualize is not directly associated to a geometry that could
be used to visualize them. Each input data has thus to be associated to a visual
rendering (output shape) that will be placed at a particular output location. The
output location describes whether the output rendering takes place directly
in the 3D space ( 3DSpace ) or whether it is attached to an object of the model
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