 The objective of this paper was to evaluate the accuracy of two advanced blending algorithms to downscale moderate resolution imaging spectroradiometer, MODIS, indices to the spatial resolution of Landsat. We tested two approaches, index then blend, IB, and blend then index, BI, when simulating nine indices. The IB approach produced higher accuracy than the BI for all line indices at all three sites. This article was authored by Abdullah Yarihani, Tim R. McVicker, Thomas G. Van Neel and others.