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(performance and preference). Note that for these first tests, no appreciation was
achieved concerning the harmony or the favorite of specific colors.
Color (saturation)
: The color (saturation) was only tested for task 3 (distin-
guish the administrative and the building limits) and it attained good performance
and preference.
Value
: Value compared to texture was performed better in allowing the associa-
tion of lots into two groups as in task 4, but it did not show good performance in
other tasks. Moreover, the preference indicated by the notaries was not consistent
for this conclusion since inside-by-side comparisons, texture was more appreci-
ated. This is why no conclusion is marked for the visual variable Value.
Texture
: Texture performed well for tasks 3 and 4; it helped to enhance the
association of lots into two groups. Some of the notaries mentioned that texture is
helpful to represent physical objects like the building walls or stairs but no clear
preference were noted in the side-by-side comparison.
Transparency
: In tasks 1 and 2, the 40 % transparency did not perform well
compare to 0 % transparency. For instance, combining color and transparency did
not improve the results (it was less preferable for the notaries). For readability
purposes, e.g., task 2, a high degree of transparency (between 70 and 90 %) was
likely to be most appreciated and successful. However, confusion arose when too
extensive a geometry of 3D lots was viewed simultaneously and unnecessary when
the geometry of the lots was fully visible. Nevertheless, no conclusions could be
drawn from the current results since the results were not sufficiently consistent.
Adding elements
: The addition of elements was tested for task 5 when over-
lapping spatial relationships had to be distinguished. The conclusion is clear; the
notaries fully appreciated having those elements in order to identify such spatial
relationships.
Moving elements
: For task 6, presenting floors detached by a constant dis-
tance was appreciated as a good solution to deal with an occlusion problem and it
performed well for visualization of neighboring lots on the same level touching.
However, as expected it did not perform well to identify lots that are above or below.
The typical black and white representation (boundary lines in black and vol-
umes in white) as a visual solution was tested for four tasks and performed well
for tasks 2 and 3. For task 2, it was more preferred by two of the notaries. This
result is relevant since this kind of black and white appearance, easy and fast to
product, is often used for 3D model visualisation and has a close resemblance with
traditional representation of a 2D cadastral plan.
4 Comparison with Graphic Semiology Frames
In order to complete this first analysis, a comparison is proposed with references
widely accepted by the specialists in the field of the semiology of graphics; the
organization of the visual and perceptual components of the graphic for trans-
mitting a message. This second segment of analysis will also help us to describe
