[ncl-talk] regridding CMIP5 coarse resolution output to high resolution (0.5 x 0.5) using area_conserve_remap_Wrap

[Mary Haley]

Samy,

I'm not sure what you mean by your question.  Are you asking how to compare
whether the regridding is correct or not?

If you use ESMF regridding, and you have NCL V6.3.0, then you can set

 Opt at Check = True

This turns on the "--check" option in the regridding, which the ESMF folks
describe as:

 "This option performs a regridding operation on an analytic field using
the weights and computes both the interpolation error and the conservation
error (if used with a conservative interpolation method). These errors are
then output to the user. "

The output will look like this:

      Grid 1 min:    1.0001662906361517          Grid 1 max:
 2.9998337097885632
      Grid 2 min:    1.0004992779714816          Grid 2 max:
 2.9995007220286158

      Maximum negative weight =    0.0000000000000000
      Maximum positive weight =   0.74984053650072569

      Mean relative error     =    1.9234096383084854E-004
      Maximum relative error  =    4.4673574673482763E-003
      Least squares error     =    2.4340317596281900E-004

      Grid 1 area =    0.0000000000000000
      Grid 2 area =    0.0000000000000000
      Conservation error =    0.0000000000000000

--Mary


On Thu, Jun 9, 2016 at 7:36 AM, <ratebsamy at yahoo.com> wrote:

> Hello NCL Team,
>
> Good afternoon. I am samy ashraf a phd student in ICTP institute and have
> the output for carbon cycle parameters from CMIP5 on coarse resolution
> (3.75 x 2.5 degree for example) and I want to regrid it to high resolution
> (0.5 x 0.5) degrees using *area_conserve_remap_Wrap*
> <http://www.ncl.ucar.edu/Document/Functions/Contributed/area_conserve_remap_Wrap.shtml>
> in order to compare it with gridded observation data on 0.5 x 0.5, so my
> question is the regridding is correct or not?
>
> Thanks in advance
>
> Best
>
> Samy
>
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