[ncl-talk] specx_anal and wavelet

[Dennis Shea]

The answer is:  I don't know. Sorry.

On Thu, Oct 29, 2015 at 5:17 PM, yang yang <yang.yang816 at gmail.com> wrote:
> 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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>
>