[ncl-talk] Regridding GFS rectilinear grid to Polar Stereographic regional grid

[Mary Haley]

Hi Andrew,

I don't know if anybody responded to this so I'm following up.

The code is a bit difficult to follow because it has quite a few "if"
statements, making it hard to tell what code is being executed and what
isn't.  This is especially difficult if you can't run the program.

I think that ESMF is always worth a try for regridding, but rgrid2rcm
should work as well.  However, you have to be careful with data like
precipitation when you are regridding.

Please see this general overview on regridding:

https://climatedataguide.ucar.edu/climate-data-tools-and-analysis/regridding-overview

Meanwhile, is there anyway you can provide the data with this script so I
can run it?

--Mary


On Wed, Oct 26, 2016 at 4:21 PM, Andrew Kren - NOAA Affiliate <
andrew.kren at noaa.gov> wrote:

> Dear ncl-talk,
>
> I have a code where I want to do a a difference in precipitation between
> the observed precipitation and model output from the GFS model. In order to
> compute the difference I regrid the data using rgrid2rcm_Wrap. The observed
> precipitation is on a polar stereographic 2d lat/lon grid. When I did the
> regridding, I am getting missing values at all locations. Is this not the
> best way to regrid the data?
>
> The issue is that the observed data is on either a CONUS grid, or an
> Alaska grid, but both are grib files with a defined grid. Should I use
> ESMF. I attached the code and the 'exit' statement is where I stopped to
> try to print out the values after computing the difference of gfs precip
> minus observed precip. I am not sure the best way to go about doing this
> comparison.
>
> Thanks,
>
> --
> Andrew Kren, PhD
> Research Scientist I, Global Observing Systems Analysis (GOSA) Group
> NOAA ESRL Global Systems Division (Rm 3C515)
> 325 Broadway, Boulder, CO 80305
> (303) 497-5418
>
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