In the first step, the Fourier transform is performed in space (longitude), and then the time series of the space Fourier coefficients are derived. In the second step, the wavelet transform is performed on these time series, and wavelet coefficients are derived. A Fourier–wave...
From your description it looks like your signal in both cases is aperiodic. So, equation 15 does not apply. You can still calculate the RMS if you take a window of the signal and apply the Fourier transform. Then calculate the RMS with the square root of the sum of squares of the...
Time seriesThe Lomb-Scargle discrete Fourier transform (LSDFT) is a well-known technique for analyzing time series. In this study, a solution for empirical orthogonal functions (EOFs) based on irregularly sampled data is derived from the LSDFT. It is demonstrated that this particular algorithm ...
This tool operates the Log Ratio Transform algorithm developed by Stumpf et al., [22]. It is integrated in the ENVI software (Exelis Visual Information Solutions, Boulder, CO, USA, v.5.3) as a Spectral Processing Exploitation and Analysis Resource (SPEAR) tool, from now ENVI-SPEAR tool. ...