Mapping urban scene elements optical properties using a gradient-driven 3D radiative transfer model. - Jean-Philippe Gastellu-Etchegorry; Zhijun Zhen; Johan Hedman; Yingjie Wang; Abdelaziz Kallel; Jonathan León-Tavares; Nicolas Lauret; Eric Chavanon; Jordan Guilleux; Tiangang Yin (JURSE, 2025)