 The MODIS Collection 6-C6 data set was compared to its predecessor, MODIS Collection 5-C5, to evaluate the accuracy and consistency of the data. It was found that the C6 data set had better agreement with the C5 data set than expected, given the difference in spatial resolution. Additionally, the improvements made to the algorithm inputs resulted in higher accuracy for LAI and FPAR measurements. This article was authored by Kai Yan, Tejin Park, Guangjin Yan, and others.