Also visual interpretation, using expert knowledge, of MODIS
images with 721 composite has been performed for the purpose.
In order to preserve normalization for better comparison
we have set the threshold from 0 to 1 while applying water
indices to MODIS images. It has been observed that varying
the threshold to the best values could impact the efficiency
of the individual method, also reported by McFeeters (1996),
Xu (2006), Ouma and Tateishi (2006) and Wu et al. (2008),
but gives relatively same accuracy. This might be due to poor
atmospheric correction of images. Note that the Earth
Observing System Data and Information System (EOSDIS)
provides MODIS images that are atmospherically corrected
but due to diurnal variations in atmospheric parameters it
would not be possible to purely normalize the images by
atmospheric correction.