Re: function in NCL for 10-day high pass filter

From: Jing YANG (yangjing AT mail.iap.ac.cn)
Date: Thu Oct 27 2005 - 14:09:34 MDT


Hi, Xuguang

  As to my knowledge, there are *at least" two ways in NCL you can use for band-filtering analysis (also appropriate for low-frequencey filter and high-frequncey filter).
  1) Fourier harmonics anal: using *ezfftf* and *ezfftb* together, which is most tranditional and simpliest way to extract the signals you need from a time series.
  2) Lancos filtering: http://www.ncl.ucar.edu/Document/Functions/Built-in/filwgts_lancos.shtml, which also works well.

  Good luck!

Jing

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