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More investigation is required. Nevertheless, the comparison with three references
confirms some of our results. For instance, color (hue) and texture perform rela-
tively well in 2D and 3D, no matter which tasks are carried out. Colin Ware has
proposed a lot of rules for visualization in his book “Information Visualization”.
One important rule in his theory is that the shape and structure perception of an
object is a process prior to the understanding of its detailed underlying mean-
ings. By this rule, we can divide visual tasks into two categories of elementary
perception tasks: one is shape perception and the other is semantic information
visualization. Based on this rule, it is sensible to predict that shape perception is a
priory requirement and without good shape perception, it is impossible to achieve
good semantic information visualization. In a future work, it could be interesting
to pursue a comparison with Colin Ware theory in order to validate our approach
according to concepts of information visualization and for improve our next exper-
imentation if necessary.
Certainly, additional interviews with notaries who previously worked with the
studied condominium would be required to complete the results. For information
purposes, Quebec City currently has 220 notaries, among whom approximately
only 20 % are working on co-ownerships (condominiums). If we estimate those
notaries potentially interested in 3D modelling to be 30 %, the statistical popula-
tion would then be 15. With a confidence level of 95 % and to keep the margin
of error below 25 %, we would then require at least 8 interviews with notaries.
Performing the experiments with notaries unaware of the condominium context
would also be of interest. This group would have to be analyzed separately since
such knowledge may influence responses. Interviews with young notaries (or uni-
versity students) having little skill would also be interesting since the experience
may influence the results and because young people are part of this new genera-
tion, more familiar and receptive to the digital world. Students will be the next
generation of notaries and initiation to 3D modelling may be an interesting value-
added in their training program and as up-and-coming professionals. The difficulty
in finding other complex condominiums, with available 3D models, and notaries
interested in the 3D modelling process, is a challenge.
The use of videos was helpful to monitor the time and the learning process but
it also limits us, or the users, to specific animation. 3D model navigation is thus
quite limited and loosely integrated in the test. Additional tests with 3D viewing
tools are anticipated. One other concern is the fact that, for these tests, each visu-
alization task was considered separately. However, with a 3D viewing tool, a user
should be able to perform all of these tasks without changing the representation
of the 3D lots. A certain combination of tasks would be studied in a subsequent
phase. In the same manner, for the time being, the combination of visual variables
was not tested.
The premise of this work regarding the value-added of 3D models for cadas-
tral applications may also be questioned. As previously indicated, many works
in the literature already addressed this topic and this is why we decided to take
it as a true assumption. Yet during the interviews with notaries, most of them
were still concerned about having a better understanding of the uses for 3D
