A generic approach for sunlight and shadow impact computation on large city models
Résumé
Study of sunlight and shadow effects on the city has become more accessible with the development of 3D city
models. It allows measuring when and how an object is exposed to the sunlight, which enables conducting many
related studies such as energy analyses or urban planning. While many works have been done for this purpose, it
may be interesting to know which objects (terrain, buildings, trees, etc.) prevent other objects from being
exposed to the sunlight. In this paper we propose a method which detects the sunlit zones on a city model and the
shadow impact of its objects. As these objects can be of various natures and as the acquisition processes varies
from one city to another, they are not all necessarily available in each city model. Since an object’s shadow can
impact other very distant objects, we must have a method that handles efficiently large areas, especially knowing
that city models can have fine geometric and semantic definitions. The generic approach we propose can manage
these different city models by supporting every type of the above-mentioned objects and by relying on the use of
standards.
This paper presents a generic method which allows sunlight and shadow computation on arbitrarily large 3D city
models for impact analyses of each city object on its surroundings (close and far). This means that besides
checking if a city object is shaded or not, we know which objects are responsible for the shade, thus allowing
various impact analyses on cities.
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