<div dir="ltr"><div><div>I have not used NCL's 2D-ffts other than in a trivial fashion so I am not confident in offering usage advice.<br><br><a href="http://www.ncl.ucar.edu/Document/Functions/Built-in/fft2df.shtml">http://www.ncl.ucar.edu/Document/Functions/Built-in/fft2df.shtml</a><br><a href="http://www.ncl.ucar.edu/Document/Functions/Built-in/fft2db.shtml">http://www.ncl.ucar.edu/Document/Functions/Built-in/fft2db.shtml</a><br>---<br></div>Nobody has contacted me regarding any function(s) that do 'space-time spectral analysis'<br><br></div>Sorry <br><div><div><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Feb 13, 2017 at 3:38 PM, Xi Chang <span dir="ltr"><<a href="mailto:xi.chang01@gmail.com" target="_blank">xi.chang01@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi Denis,<div><br></div><div>No, I meant a 2D FFT cross spectrum. I want to calculate the co-spectrum as a function</div><div>of wavenumber and frequency as done by Randel and Held (1991):</div><div><br></div><div><a href="http://journals.ametsoc.org/doi/pdf/10.1175/1520-0469(1991)048%3C0688%3APSSOTE%3E2.0.CO%3B2" target="_blank">Phase Speed Spectra of Transient Eddy Fluxes and Critical Layer</a><span class="HOEnZb"><font color="#888888"><br></font></span></div><span class="HOEnZb"><font color="#888888"><div><br></div><div>Chang,</div><div><br></div></font></span></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Feb 13, 2017 at 4:10 PM, Dennis Shea <span dir="ltr"><<a href="mailto:shea@ucar.edu" target="_blank">shea@ucar.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Not sure of your semantics: "<font size="2"><span style="font-weight:normal">space-time cross spectral analyses"<br><br><a href="http://www.ncl.ucar.edu/Document/Functions/Built-in/specxy_anal.shtml" target="_blank">http://www.ncl.ucar.edu/Docume<wbr>nt/Functions/Built-in/specxy_<wbr>anal.shtml</a><br><br></span></font><a href="http://www.ncl.ucar.edu/Applications/spec.shtml" target="_blank">http://www.ncl.ucar.edu/Applic<wbr>ations/spec.shtml</a><br></div>See Example 2<br></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="m_8885739023095898185h5">On Mon, Feb 13, 2017 at 2:47 PM, Xi Chang <span dir="ltr"><<a href="mailto:xi.chang01@gmail.com" target="_blank">xi.chang01@gmail.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="m_8885739023095898185h5"><div dir="ltr">Dear NCL users,<div><br></div><div>Anybody has a suggestion or code to compute space-time cross-spectrum</div><div>between 2 variables? I need to have the co-spectrum output as a function</div><div>of "k and frequency".</div><div><br></div><div>Thank you.</div><span class="m_8885739023095898185m_-7036343574795674558HOEnZb"><font color="#888888"><div>Chang.</div></font></span></div>
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