1 Investigation of Product Accuracy as a Function of Input and Model Uncertainties: Case Study with SeaWiFS and MODIS LAI/FPAR Algorithm Yujie Wang 1 , Yuhong Tian 1 , Yu Zhang 1 , Nazmi El-Saleous 2 , Yuri Knyazikhin 1 , Eric Vermote 2 , and Ranga B. Myneni 1 1 Department of Geography, Boston University, Boston, MA 02215, USA 2 NASA Goddard Space Flight Center, Code 922, Greenbelt, MD 20771, USA Correspondence Yujie Wang Department of Geography , Boston University 675 Commonwealth Avenue, Boston, MA, 02215, USA email: yjwang@bu.edu telephone: 617-353-8845 fax: 617-353-8399 Submitted for publication in Remote Sensing of Environment June 10, 2000