Mapping the soil C:N ratio at the European scale by combining multi-year Sentinel radar and optical data via cloud computing - Xinyue Wang; Yajun Geng; Tao Zhou; Ying Zhao; Hongchen Li; Yanfang Liu; Huijie Li; Ruiqi Ren; Yazhou Zhang; Xiangrui Xu; Tingting Liu; Bingcheng Si; et al. (Soil and Tillage Research, 2025)