The High Resolution Water Vapor Wind product is using a slightly different
algorithm (FFT surface correlation) as the WV part of the ELW product, and the
WV images are divided into sub-areas of 16x16 pixels, i.e. the same resolution
as the HRV product. Only segments where a cloud has been detected are
processed. The HWW is generated every 1.5 hours and distributed in BUFR.
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[Summary Extracted from the EUMETSAT Home Page]