[ncl-talk] ESMF_regrid in 3D

[Mary Haley]

Amanda and Marston,

If you are simply talking about regridding each level independently, then
you can actually pass a 3D variable to ESMF_regrid, and it will do the
looping under the hood. What this function does is creates the weights for
one level, and applies them to the rest of the levels.  It assumes that the
lat/lon grid is the same for each level.

If the lat/lon grid changes for each level, or you have different locations
for missing values for each level, then yes, you need to loop and do the
regridding separately for each level.

Examples ESMF_regrid_5.ncl does this, although it's not very well
advertised. You just pass in the 3D variable instead of a 2D variable, and
it should work.

--Mary

On Fri, Mar 31, 2017 at 5:07 AM, Marston Johnston <shejo284 at gmail.com>
wrote:

> You have to loop over the depth yourself. Even if ESMF would do this for
> you - and it doesn’t, it would still just do a 2D regrid inside a loop over
> the depth.
>
> On 31 Mar 2017, 12:55 +0200, Amanda Frigola <afrigola at marum.de>, wrote:
>
> Hi there!
>
> I am trying to regrid a 3D variable with coordinates (depth, lat_1, lon_1)
> to ​coordinates (depth, lat_2, lon_2).
> I wanted to use the function ESMF_regrid for that, but I can only find
> examples for 2D variables online.
> My version of ncl is 6.3.0.
> Any clue about how to get there?
>
> Amanda
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