2.3.3. Data regulation
The number of elements in the input data array should be a power of 2 for both wavelet and Fourier transforms. To make an input array with 2048 elements, we used a year's VI data continuously and recursively to fill the array in observational date order. Missing data were linearly interpolated. We used 365 elements of the output array from the 730th to the 1094th as the smoothed time profile of EVI. We used this processing to avoid the aliasing effect.