[ncl-talk] [EXT] regridding routine for grids with 2D lat and lon

[Dennis Shea]

Hi Diana,

Bill Schfetic's response is correct.:  ESMF is the way to go.

*http://www.ncl.ucar.edu/Applications/ESMF.shtml*
<http://www.ncl.ucar.edu/Applications/ESMF.shtml>
ESMF_{16, 20} are two examples.
---
Note that the regridding requires the source and destination lat/lon grid
values.
Map projection information is not used.
---
If you can make the source file and the  destination grid coordinates
available [drop box, ftp, ...] , I could take a look.

ftp ftp.cgd.ucar.edu
anonymous
your_email
cd incoming
put SOURCE_FILE
quit


Stay Healthy!
D

On Wed, Apr 29, 2020 at 7:51 PM William Scheftic via ncl-talk <
ncl-talk at ucar.edu> wrote:

> Hi Diana,
>
> I haven't done your specific regridding.  But using the ESMF regridding
> routines is the best way to go.  You can save the regridding in a special
> netCDF file that only you requires the regridding weights to be calculated
> once and then reloaded for future needs.  There are some examples that deal
> with non-rectilinear grids sending in 2-d lat and lon grids, rather than
> 1-d.
>
> http://www.ncl.ucar.edu/Applications/ESMF.shtml
>
> http://www.ncl.ucar.edu/Document/Functions/ESMF.shtml
>
> Cheers,
>
> Bill
>
>
> On 4/29/2020 3:17 PM, Diana Stovern - NOAA Affiliate via ncl-talk wrote:
>
> *External Email*
> Hello,
>
> I need to regrid rainfall data from a lambert conformal grid to a polar
> sterographic grid.  The lat and lon data in both grids are 2D arrays (see
> filedump output below).  Is there a regridding routine in NCL that allows
> for both the input and output lat and lon to be 2D arrays?  I see most of
> the routines require lat and lon to be 1D arrays.
>
> Thanks!
>
> Diana Stovern
>
>
> *Grid 1:*
>       float gridlat_0 ( ygrid_0, xgrid_0 )
>          corners :      ( 23.117, 19.80368, 45.61871, 53.51192 )
>          long_name :    latitude
>          grid_type :    Polar Sterographic Projection (North or South)
>          units :        degrees_north
>          Dy :   4.763
>          Dx :   4.763
>          Lov :  255
>          Lo1 :  240.977
>          La1 :  23.117
>
>       float gridlon_0 ( ygrid_0, xgrid_0 )
>          corners :      ( -119.023, -80.74672, -59.95137, -134.043 )
>          long_name :    longitude
>          grid_type :    Polar Sterographic Projection (North or South)
>          units :        degrees_east
>          Dy :   4.763
>          Dx :   4.763
>          Lov :  255
>          Lo1 :  240.977
>          La1 :  23.117
>
> *Grid 2:*
>       float gridlat_0 ( ygrid_0, xgrid_0 )
>          corners :      ( 20.192, 20.33182, 54.37271, 54.20572 )
>          long_name :    latitude
>          grid_type :    Lambert Conformal (secant, tangent, conical or
> bipolar)
>          units :        degrees_north
>          Latin2 :       25
>          Latin1 :       25
>          Dy :   2.539702
>          Dx :   2.539703
>          Lov :  265
>          Lo1 :  238.446
>          La1 :  20.192
>
>       float gridlon_0 ( ygrid_0, xgrid_0 )
>          corners :      ( -121.554, -69.20839, -59.04248, -131.9951 )
>          long_name :    longitude
>          grid_type :    Lambert Conformal (secant, tangent, conical or
> bipolar)
>          units :        degrees_east
>          Latin2 :       25
>          Latin1 :       25
>          Dy :   2.539702
>          Dx :   2.539703
>          Lov :  265
>          Lo1 :  238.446
>          La1 :  20.192
>
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