All data sets to be merged must be accurately registered to one another and resampled to the same pixel size. Several alternatives exist for merging the data sets, including:
Simple band substitution methods
Color space transformation and substitution methods using various color coordinate systems.
Substitution of the high spatial resolution data for principal component 1,
Pixel-by-pixel addition of a high frequency-filtered, high spatial resolution dataset to a high spectral resolution dataset,
Smoothing filter-based intensity modulation.