Re: Band Pass filter to dataset with topographic masking

From: Dennis Shea <shea_at_nyahnyahspammersnyahnyah>
Date: Fri Jan 25 2013 - 15:02:11 MST

I answered this before (Jan 12, 2013).
I am not sure what more I can say.

For each grid point, the time series is operated upon
by (say) a FFT or, optionally, a weighted running average.

If the time series of values contains one or more missing values,
a band pass filter can not be performed.

As noted before, if you want values at grid points where u850
is _FillValue, you must provide them.

If you are applying "band_pass_latlon_time" I think it provide a warning
message that grid points have time series with missing values.
I thing it still does the computations at al grid points where
there are valid time series.

Good luck

On 01/25/2013 06:24 AM, Abhik Santra wrote:
> Hello,
> I want to use 20-100-day band-pass filter to the anomalous u850 data from MERRA Reanalysis.
> But the region in high mountains (e.g. the Himalaya/ Tibetan plateau) is masked with missing values in the dataset.
> So, the "band_pass_latlon_time" function is not allowing me to filtering the dataset.
> What is the alternate way to use the filter?
> With regards,
> Abhik
> ___________________________________________
> Abhik Santra
> CSIR Research Fellow,
> Indian Institute of Tropical Meteorology,
> Pune - 411008.
> India
> ___________________________________________
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Received on Fri Jan 25 15:02:22 2013

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