nine time-series image pairs of Landsat-5 TM and TERRA and
MODIS in the Poyang Lake area, China in 2004 and 2005.
Using five EM spectral libraries, three comparisons of the LCFs
derived from the observed and blended reflectance were made.
Although ESTARFM could blend the reflectance accurately in
visible and shorter SWIR bands, it could not always generate
accurate blended reflectance in NIR and longer SWIR bands.
The large differences between the observed and blended
reflectance in those bands brought a large number of unmodeled
pixels, unmixing of the blended reflectance with unrealistic EM
combinations, confusion between two water classes, and
overestimation and underestimation of the LCFs. And they
consequently led to the poor percentages of modeled pixels, low
kappa coefficients in EM class accuracy assessment, and large
AADs between the LCFs derived from the observed and
blended reflectance. Although there is a need for the refinement
in building the EM library, this study achieved strongest
agreement between the LCF derived from the observed and
blended reflectance data when using the optimal EM spectra
chosen from the candidate spectra collected from the observed
data on prior and posterior dates of the target dates.
ACKNOWLEDGEMENTS
This study was supported by the Ministry of Science and
Technology, China, National Research Program (2012
CB955501, 2010CB530300, 2009A4A122004, 2007BAQ01071-
4), the National Natural Science Foundation of China
(40971214), and the 2007 University of Utah Synergy Grant,
USA.
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