[ncl-talk] specx_anal and wavelet

[yang yang]

Hi Dennis:

Thanks very much!

I am now trying to figure out how to set the parameters and interpret my
calculation.

Suppose that I have 1-d spatial data (size:300) with regular 100 m
interval. Using the example wavelet_1.ncl, I set N = 300 and the other
parameters unchanged. After the calculation, can I take the Y-axis of
power({0:64}, :) as wavelength (unit: 100 m), instead of periods?

Thanks!

Ed

On Fri, Oct 30, 2015 at 11:45 AM, Dennis Shea <shea at ucar.edu> wrote:

> Just like 'filwgts_lanczos' where examples are focused on time. NCL's
> wavelet function is focused on time. However, like 'filwgts_lanczos'
> it could be applied to space. In both applications the values must be
> equally spaced. (This may require interpolation.)
>
> As noted at
>    http://www.ncl.ucar.edu/Document/Functions/Built-in/wavelet.shtml
>
> NCL's wavelet function is a direct interface to the fortran software at:
>
>    http://www.ncl.ucar.edu/Document/Functions/Built-in/wavelet.shtml
>
> More details are at:
>
> Torrence, C. and G. P. Compo, 1998: A Practical Guide to Wavelet
> Analysis. Bull. Amer. Meteor. Soc., 79, 61-78.
>
>      http://dx.doi.org/10.1175/1520-0477(1998)079<0061:APGTWA>2.0.CO;2
>
> This will clarify the terminology used by the software.
>
> Good luck
>
> On Thu, Oct 29, 2015 at 4:28 PM, yang yang <yang.yang816 at gmail.com> wrote:
> > Dear Sir/Madam:
> >
> > specx_anal: Calculates the spectra of a time series. Does NCL have a
> similar
> > function for a 1-D spatial series? For example, I have a radiosonde,
> would
> > like to see the variances vs. wavelength.
> >
> > wavelet calculates the wavelet transform of a time series and
> significance
> > levels. Does NCL have a similar function for a 1-D spatial series? For
> > example, I have a radiosonde, would like to see the wavelet powers for
> > different wavelength at different heights.
> >
> > Thanks very much!
> >
> > Regards
> > Ed
> >
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