[ncarg-talk] regular grid to tripolar grid

[Mary Haley]

Dear Jiande,

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I think you should be able to regrid the tripolar directly to a tripolar
grid. Both tripolar grids are curvilinear, correct? That is, they are
represented by 2D lat/lon grids?

If so, see example #11 at:

http://www.ncl.ucar.edu/Applications/ESMF.shtml#ex11

This example goes from a tripolar to MPAS grid, but I believe you could
modify these lines:

    Opt at DstGridLat        = latCell            ; Destination grid
    Opt at DstGridLon        = lonCell
    Opt at DstGridType       = "unstructured"

to:

    Opt at DstGridLat        = dst_lat            ; Destination grid
    Opt at DstGridLon        = dst_lon
    Opt at DstGridType       = "curvilinear"

Where dst_lat and dst_lon are the 2D lat/lon grid for the destination
tripolar grid.

You may also want to change this to whatever interpolation method you want
("bilinear" is the default):

    Opt at InterpMethod      = "patch"    ; bilinear, conserve, neareststod,
nearestdtos

If you use "conserve", then you should also provide the grid corners. The
ESMF examples page explains some of this.

Finally, if your source and/or destination grids are regional, you should
also set:

Opt at SrcRegional = True   ; if source tripolar is regional
Opt at DstRegional = True   ; if destination tripolar is regional

--Mary


On Thu, Jul 6, 2017 at 2:57 PM, Jiande Wang - NOAA Affiliate <
jiande.wang at noaa.gov> wrote:

> Hi,
>   I am new to NCL.
>  I have a tripolar grid ocean data and want to regrid it to another
> tripolar grid.
>   What I plan to do is first regrid the original tripolar grid data to
> regular lat/lon data. Then I will regrid the regular data to new tripolar
> grid.
>   I know what to do in the first step, but not clear on how to do in the
> second step.
>   Has any one have experience or script on my task?
>
>  Your suggestion will be appreciated.
>
> Thanks
> Jiande
>
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