Re: Is there a interpolation method for cyclic data?

Hi Xin Xie,

Maybe you can use poisson_grid_fill:
http://www.ncl.ucar.edu/Document/Functions/Built-in/poisson_grid_fill.shtml

Good luck,

Carlos

Em Tue, 17 Mar 2009 20:58:37 +0800
  Xin Xie <xiexin163_at_gmail.com> escreveu:
> hi,
>
> I need to interpolate a global SST 2D data with some
>missing_value in
> some grids into a global full distributed gird.
> (Yes, to fill in the missing_value on land!) After
>walking around the
> NCL web, I found that linint2 won't give me the
>solution,
> because it generates a missing_value if the input data
>have
> missing_value. I soon figured out a 1D
> method to do this ------ choosing a row, picking out all
>data that are
> not missing, and use linint1 to interpolate them onto
>the
> chosen grid.
>
>For example:
> u = (-999, -999, 1, 2, -999, -999, 3, 1, 2, -999)
> with
> lon = (1, 10, 40, 80, 120, 160, 200, 250, 280, 300 )
> and -999 is missing_value
>
> I picked up
> notmissu = (1, 2, 3, 1, 2)
> with
> notmisslon=(40, 80, 200, 250, 280)
>
> then I use linint( notmisslon, notmissu, True, lon, 0)
>to interpolate
> the data to a full zonal loop (turn on cyclic).
> It now gives me the two missing values on lon 120 and
>160 althought
> the values on lon 1, 10 and 300
> are still missing.
>
> It is obvious that we can use the values on 40 and 280
>to interpolate
> the value on those three grids.
> I wonder if there is a way to do this?
>
> Your help is appreciated!
>
> Xie Xin
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Received on Tue Mar 17 2009 - 07:17:07 MDT