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The index is derived from support\nlayers calculated from seasonal compositesin which each pixel in a given layer is classified as \u201cdry\u201d,\n\u201cwet\u201d or \u201c(open) water\u201d. Based on the same seasonal composites as applied for the classification\nof water and wetness, the WWPI is derived for each \u201ccolumn\u201d of pixels in the stack. The WWPI is\ncalculated according to the number of WATER and WET occurrences, the latter with a weighting\nfactor of 0.75 (this value was confirmed after the analysis of the streamlining results), divided by\nthe total number of valid observations (sum of WATER, WET and DRY occurrences). 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