Geoscience Reference
In-Depth Information
Fig. 7
Two examples of 3D models tested for task 6—Understand the spatial relationships
(mainly the surrounding relationships—upper and beside) between 3D lot (
in red
) and its sur-
rounding lots.
a
Color floors not detached.
b
Color floors detached
2.3 Interviews with Notaries
The methodology used to perform the visual variable assessment consists of hold-
ing face-to-face interviews with a notary, seated in front of the computer, with lim-
ited interventions on the part of supervisors. During the interviews, notaries were
presented with a proposed 3D model, for which they had to respond to a series of
questions related to visualization tasks. The initial plan was to let the notaries play
with the 3D model in using 3D visualization software (such as Acrobat 3D PDF).
However, since most of the notaries are not familiar with such 3D visualization
software and time constraints had to be managed, videos were prepared in which
a specific 3D model animation is presented. The video animation guides the nota-
ries in the visualization process by turning the 3D model (vertical or horizontal)
upside down, zooming in and out when required, depending on the visualization
task. The notaries may stop, rewind and fast forward the video as they wish. Using
prebuilt videos of animated 3D models helps us to reduce the impact of the 3D
visualization software learning process while retaining some benefits of the navi-
gation aspect of 3D model visualization. To perform the test with the notaries and
since the focus of these tests is only on the visualization aspects, no legend is used
in the experiment, and mainly the visual aspect of the 3D model may influence the
responses and preferences of the viewers. During the interviews, all of the users'
comments and the times are recorded.
For each task, two categories of questions were prepared. The first group of
questions is based on factual easy to verify elements. Consequently the answers
can be easily checked. Here is the list of questions used:
• Task 1: How many lots are you able to count?
• Task 2: At which loor is lot 5 252 285 located?
