Re: Regridding from regular lat lon to rotated lat lon

Hi Matthias,

Through a collaboration with the Earth System Modeling Framework at NOAA/CIRES, we will have some new regridding capabilities available in NCL V6.1.0-beta (this will be the release before NCL V6.1.0).

You can see a new page of examples, that is currently under construction:

http://www.ncl.ucar.edu/Applications/ESMF.shtml

Can you provide me with the two lat/lon grids and the variable you want to regrid, and I'll see if our new regridding software can handle it?

You can use our ftp:

http://www.ncl.ucar.edu/report_bug.shtml#HowToFTP

Thanks,

--Mary

On Feb 21, 2012, at 10:52 AM, Matthias Demuzere wrote:

> Dear all,
>
> Basically I would like to regrid a regular lat/lon input file to a rotated lat/lon input file. For both grids, I have the input available:
>
> 1. Regular lat/lon -> This is the initial 0.25° grid, with different sizes depending on the variables (varying between 1 and 4D variables)
> Horizontal grids :
> 1 : generic > size : dim = 260
> 2 : generic > size : dim = 2600 nx = 260 ny = 10
> 3 : generic > size : dim = 4420 nx = 260 ny = 17
> 4 : generic > size : dim = 1
> 5 : generic > size : dim = 520 nx = 260 ny = 2
> 6 : generic > size : dim = 3900 nx = 260 ny = 15
> Vertical grids :
> 1 : surface : 0
> 2 : generic month : 1 2 3 4 5 6 7 8 9 10 11 12
> 3 : generic level : 1 2
> Time axis : 200 steps
>
> and
>
> # gridID 0
> #
> gridtype = generic
> gridsize = 260
> xname = x
> xunits = degrees
> yname = y
> yunits = degrees
> xsize = 260
> #
> # gridID 1
> #
> gridtype = generic
> gridsize = 2600
> xname = x
> xunits = degrees
> yname = y
> yunits = degrees
> xsize = 260
> ysize = 10
> #
> # gridID 2
> #
> gridtype = generic
> gridsize = 4420
> xname = x
> xunits = degrees
> yname = y
> yunits = degrees
> xsize = 260
> ysize = 17
> #
> # gridID 3
> #
> gridtype = generic
> gridsize = 1
> xname = x
> xunits = degrees
> yname = y
> yunits = degrees
> #
> # gridID 4
> #
> gridtype = generic
> gridsize = 520
> xname = x
> xunits = degrees
> yname = y
> yunits = degrees
> xsize = 260
> ysize = 2
> #
> # gridID 5
> #
> gridtype = generic
> gridsize = 3900
> xname = x
> xunits = degrees
> yname = y
> yunits = degrees
> xsize = 260
> ysize = 15
>
>
>
> 2. Rotated lat/lon -> this grid is the TARGET grid, with the following specifications:
>
> pollon=-167.5
> pollat=40
> polgam=0
> ie_tot=200
> je_tot=200
> startlon_tot=-23
> startlat_tot=-23
> dlon=0.23
> dlat=0.23
>
> Now, the idea is to regrid the INITAL grid onto the TARGET grid, but I am not sure how to do this with ncl.
>
> Normally I would use CDO, but here there is the limitation that CDO can not handle the "generic" grid type from the initial file.
> Now, when I would set the gridtype to lonlat (with CDO), the 1D variables are removed from the INITIAL file, as CDO as not able to deal with them.
>
> Hence, I was wondering whether NCO or NCL is able to deal with this specific issue?
> I noticed a number of examples on regridding, but I haven't seen an example on how to regrid on a predefined TARGET grid?
>
> Any ideas?
> Kind regards,
> Matthias
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Received on Tue Feb 21 14:47:04 2012