Geoscience Reference
In-Depth Information
This chapter is organized as follows. The
Sect. 2
presents the experimental
setup for the interviews. The
Sect. 3
proposes an analysis of the results. The final
section provides a conclusion and opens up discussions about future works.
2 Experimental Setup for the Interviews
2.1 Visualization Tasks
The experimental framework first established a list of 3D visualization tasks
deemed to be necessary for notaries in establishing co-ownership limits applied to
condominium building. This list of 3D visualization tasks will help us in structur-
ing the interviews, the questions to be asked, and further analysis. This list was
validated together with notaries. Six visualization tasks were identified:
1. See the geometric limits of the 3D lots
2. Locate a specific 3D lot inside the building
3. Distinguish the limits of the 3D lot and the associated building
4. Distinguish the private and common parts of the condo
5. Understand the spatial relationships (mainly the overlapping relationships)
between the building and the 2D land parcel
6. Understand the spatial relationships (mainly the surrounding relationships)
between a 3D lot and its surrounding lots.
Note that the term “lot” corresponds to the minimal administration unit of the
Quebec cadastral system used to establish property rights.
2.2 3D Visual Solutions
The next step is to select a case study and to determine a set of 3D visual solutions
to be tested. In collaboration with a private land surveying company (Groupe
VRSB) that routinely conducts condominium surveys and mapping for the delimita-
tion of property rights, a complex building was selected. Figure
1
shows the build-
ing under study that is approximately 30 m in width, 32 m in length, 36 m in height
(10 floors), 70 lots (20 private units and 50 common units). The 3D model proposes
the geometry of the 3D lots and its corresponding annotations (official measures
such as the lot number, the length of the boundaries, the surface and the volume).
Based on the original 3D geometric model of the condominium created by the
Groupe VRSB, a set of 3D cadastral models of the condominium, named as
3D
visual solutions
, are produced to enable the experiments. For each 3D visual solu-
tion, a specific visual variable and/or enhancement technique is applied. Since the
number of possible combinations of visual variables and enhancement techniques
is quite high, a pre-selection was performed to limit the duration of the experiment
