On Line Validation Exercise (OLIVE): A Web Based Service for the Validation of Medium Resolution Land Products. Application to FAPAR Products. - Marie Weiss; Frédéric Baret; Tom Block; Benjamin Koetz; Alessandro Burini; Bettina Scholze; Patrice Lecharpentier; Carsten Brockmann; Richard A. Fernandes; Stephen Plummer; Ranga B. Myneni; Nadine Gobron; et al. (Remote. Sens., 2014)