wiki:ewspectra

Version 1 (modified by branden, 9 years ago) (diff)

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Earthworm Module: ewspectra

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Function

Takes data from one or more waveservers, computes and processes their spectra.

Details

The ewspectra module takes data from one or more waveservers, can perform a variety of operations on that data, most importantly computing an FFT and identifying the frequencies w/ the highest amplitudes in the resulting spectra. Results can be written to files in a specified directory or as messages to a ring. Specification of the timespans to process can be specified in the configuration file and/or via messages read from a ring.

The primary option is what SCNLs to monitor and, if 2 are specified, how to combine them:

  • A single SCNL is specified & its spectra computed
  • 2 SCNLs are specified and the difference between their spectra is computed
  • 2 SCNLs are specified, and their spectra are deconvolved

Other options include tapering of the original timeseries, applying high- and/or low-pass Butterworth filters, and smoothing the spectra before writing.

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