Radiometry of wet surfaces – When Water Matters

02 janvier 2023 par GDR APPAMAT
Un ouvrage collectif dirigé par Lionel Simonot, issue d'un atelier du GdR Appamat autour de la radiométrie des surfaces mouillées, vient de paraître.

Radiometry of wet surfaces – When Water Matters


Cet ouvrage collectif et pluridisciplinaire, issu de l’atelier Réflectance, BRDF, BSSRDF… Quand l’eau s’en mêle ! organisé par le GDR Appamat en 2021, s’intéresse à la manière dont la présence d’eau modifie les propriétés photométriques de surfaces, et ce selon diverses approches (modèles analytiques, modèles de rendu visuel…) et dans de multiples contextes: Synthèse d’image, Océanographie, Etude des sols par satellite, Planétologie, Sécurité routière, Impression en couleur, etc.


As everyone can see every day, many objects or materials change their appearance when they get wet. Most of the time, the object becomes more translucent, its color darker and more chromatic. Beyond these general trends, is it possible to predict these changes in appearance for a given type of surface, and for a given humidity level? This is the question studied in this book, by drawing up a first inventory of available knowledge and ongoing research in multiple fields of application: in remote sensing, to correctly identify surfaces and estimate moisture content; in public lighting, to improve visibility on wet roads; in computer graphics, to render wet surfaces in a more realistic way… There is no universal model to describe the changes in spectral, angular and spatial responses of a wetted surface. The mechanisms of light scattering are not affected in the same way according to whether the material is porous, fibrous, powdery, and can be filled by water, or impermeable and can be covered by a water layer. In some applications where the infrared domain is of interest, the strong absorptance of water is also to be considered. This book was initiated by the GDR Appamat, a grouping of research focused on material appearance created in 2019 by the French national center for scientific research (CNRS). In 9 chapters, 26 specialists from various disciplines present different approaches that open perspectives on this field of research. Hopefully, students, engineers, and researchers will be inspired by these ideas to propose future developments.

Au sommaire

  • CHAPTER 1. Pascal Barla, Loїc Lachiver and Gaёl Guennebaud. Visual Effects of Surface Tension on the Appearance of Wet Surfaces.
  • CHAPTER 2. Alice Dupiau, Stéphane Jacquemoud and XavierBriottet. Reflectance of Wet Natural Soils in the SolarDomain: Contributions and Limitations of Physical Models.
  • CHAPTER 3. Gladimir V. G. Baranoski and Mark Iwanchyshyn. Can the Interpretation of Wet Sand Spectral Responses be Considered a Solved Problem?
  • CHAPTER 4. Antoine Pommerol, Marion Massé and Bernard Schmitt. Spectro-Photometric Signatures of Water inPlanetary Regoliths
  • CHAPTER 5. Laurent Brunel. Measure of Optical Properties of Paper when wetting using Monte-Carlo Inversion
  • CHAPTER 6. Enoch Saint-Jacques and Roland Brémond. Wet Road Surfaces, a Challenge for Road Users…and for Measurement
  • CHAPTER 7. Mickaël Ribardière, Benjamin Bringier, ArthurCavalier, Léo Jourdy, Lionel Simonot, Mathieu Hébert and Daniel Meneveaux. A Virtual Goniophotometer for Modeling the Light Scattered by Rough Surfaces Covered with a Water Layer
  • CHAPTER 8. Lev Dolin, Fanny Dailliez and Lionel Simonot. Determination of the Water Layer Thickness from the Laser Halo
  • CHAPTER 9. Fanny Dailliez, Mathieu Hébert, Lionel Simonot, Lionel Chagas, Anne Blayo and Thierry Fournel. Impact of a Transparent Layer on the Color of a Non-Homogeneous Colored Support.

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