cadastral models. Should we read into this statement on a deeper level and try to
demonstrate the real value-added of 3D models for cadastral applications? The
subject might still be up for debate.
Other questions remain unanswered such as the study of the visual variables
when viewing other kinds of properties like superficies right or the use of visual
variables in combination with legend and semantic information (or integrated with
a 3D database management system). The outcomes of these research activities
would have to be put in context of current practices or standards for 3D visualiza-
tion or modelling, such as CityGML, BIM or COLLADA.
Finally, this experimentation and current work will contribute to the definition
of a new conceptual framework adapted to the production of 3D models for cadas-
tral application, more specifically notarial tasks. Such 3D specification does not
exist, which is a crucial bottleneck to the migration of 2D plan to 3D model by
this kind of users. The proposed framework will take into consideration various
relevant components such as: type of tasks and decision-making itself, the charac-
teristic involved in those tasks (selective, associative, and so on) and the category
of visual variables and enhancement techniques.
Acknowledgements We would sincerely thank the notaries who participated in the interviews
(Guy Delisle, Jean-Claude Simard, Francois Brochu) and Michel Bédard from the Groupe VRSB
for providing the original datasets of the condominium. We would also thank Marc Vasseur, a
master degree student, for helping in the validation the visual solutions. Finally, we express our
gratitude to the Natural Sciences and Engineering Research Council for funding this research
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