The Fifth Phase of the Radiation Transfer Model Intercomparison Exercise (RAMI-V): Experiment Description and Results on Actual Canopy Scenarios

作者：Christian Lanconelli, Nadine Gobron, Monica Robustelli, Jennifer Susan Adams, Kim Calders, Mathias Disney, Jean‐Philippe Gastellu‐Etchegorry, Adam A. Goodenough, Yves Govaerts, Robin J. Hogan, Huaguo Huang, Hideki Kobayashi, Andres Kuusk, Vincent Leroy, Niall Origo, Jianbo Qi, Sebastian Schunke, Martin van Leeuwen, Yingjie Wang, Donghui Xie, Yelu Zeng, Feng Zhao · 发表于：Journal of Remote Sensing · 年份：2025 · DOI：10.34133/remotesensing.0663 · 被引用次数：13 · 研究领域：Spaceflight effects on biology、Space Exploration and Technology

This paper presents the latest results of the radiation transfer model intercomparison (RAMI) of the realistic vegetation scenarios. RAMI-V included the same one-dimensional (1D) and 3D scenes of RAMI-IV phase and 2 new realistic ones, defined through a semiparametric (Savanna) and an empirical (Wytham Woods) approaches. The measurements to simulate were the bidirectional reflectance factor, directional–hemispherical reflectance, and bidirectional–hemispherical reflectance. In addition, the radiant flux transmission and absorption through and below the canopy and digital hemispherical photography were also proposed. The spectral bands were defined to mimic not only the ones of Copernicus optical missions, e.g., for the Sentinel-3 Ocean and Land Colour Imager (OLCI) and Sentinel-2 Multispectral Instrument (MSI), but also the Moderate Resolution Imaging Spectroradiometer (MODIS). New solar and viewing geometry configurations were adopted from realistic satellite overpasses for different seasons and geographical locations. The role of internal consistency checks was reinforced to provide more reliable feedback to the participants in the early stage of the experiment and reduce the role of outliers in the model-to-model comparison and the identification of a surrogate reference. Over 4 of the 8 scenarios proposed, a set of models agreed within 2% uncertainty thresholds for most of the virtual measurements defined in the experiment. Specifically, they were the birchstand both leaf...