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Empirical Assessment of the Suitability of
Visual Variables to Achieve Notarial Tasks
Established from 3D Condominium Models
Jacynthe Pouliot, Chen Wang, Frédéric Hubert and Vivien Fuchs
Abstract
This study investigates the preference and the performance of certain
visual variables (color hue and saturation, value, texture) and visual enhancement
techniques (adding labels, moving elements, transparency) for achieving specific
notarial tasks involving a 3D cadastral model. The case study is a complex condo-
minium building modeled in 3D on which six notarial tasks are explored (viewing
the geometric limits of the 3D lots, locating a specific 3D lot inside the building,
distinguishing the 3D lot and the associated building, distinguishing the private
and common parts of the condominium, understanding certain spatial relation-
ships). The approach is based on face-to-face interviews with notaries using vari-
ous prebuilt 3D geometric models of the condominium displayed on a computer
screen. From various visual variables and visual enhancement techniques, notaries
had to answer specific questions like “how many lots do you see”. Depending on
the notary's response the variable is marked as performing successful when veri-
fication is available or preferred when only a subjective and professional opinion
is available. The preliminary results based on four interviews show that color is
the visual variable most appreciated by notaries, regardless of the 3D visualization
task. The use of transparency is helpful only in few cases, specifically when read-
ing annotation (official measures). However, confusion arises when too extensive
