On the assessment of merging processes for the improvement of the spatial resolution of multispectral SPOT XS images
Résumé
Methods have been proposed to produce SPOT multispectral images with enhanced spatial resolution (10 m) owing to the presence of panchromatic band. Some of them aim at preserving the multipsectral content when increasing the spatial resolution. This communication defines the properties of such enhanced multispectral images. It then proposes both a formal approach and some criteria to provide a quantitative assessment of the spectral quality of these products. Five sets of criteria qualify the performance of a method to synthesize the radiometry in a single spectral band as well as the multispectral information when increasing the spatial resolution. The influence of the type of landscape present in the scene upon the assessment of the quality is underlined, as well as its dependence with scale. The whole approach is illustrated by the case of several SPOT images and the ARSIS concept.
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