i.wavelet Decomposes the time-series with the requested wavelet.
The output will have 4 components, High-Pass Level 1 and 2, Low-Pass
Level 1 and 2. Low Pass Level 1 can be recomposed using HP2 and LP2
using the recomposition mode.
This module is designed to make a temporal fusion from multi-sources.
More wavelet families to be included.
Yann Chemin, International Water Management Institute
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