GBOV (Ground-Based Observation for Validation): A Copernicus Service for Validation of Vegetation Land Products. - Gabriele Bai; Nadine Gobron; Jadu Dash; Luke A. Brown; Courtney Meier; Christophe Lerebourg; Erwin Ronco; Nicolas Lamquin; Véronique Bruniquel; Marco Clerici (IGARSS, 2019)