[gradsusr] Regridding in GrADS

Eduardo Agosta Scarel eduardo.agosta at gmail.com
Wed Aug 1 07:19:28 EDT 2018

Try to use the re function within a time frame:

t1= initial time
t2= final time
'set t 't1' 't2
'define newvar=re(var,0.17)

That will regrid var all through the time steps between  times t1 and t2.


El jue., 26 de jul. de 2018 a la(s) 16:26, Wesley Ebisuzaki - NOAA Federal (
wesley.ebisuzaki at noaa.gov) escribió:

> Joseph,
> I would use copygb.  Copygb has a few types of interpolation
> methods and you can define fields that are vector interpolated.
> (Affects winds near the poles.)
> Wesley
> On Wed, Jul 25, 2018 at 9:59 PM, Joseph Basconcillo <
> jbasconcillo at pagasa.dost.gov.ph> wrote:
>> Hi, I have NCEP-RA2 data that I want to regrid to N768 resolution, which
>> is about 0.17 deg in midlatitude.
>> I used:
>> 'define newvar=re(var, 0.17)'
>> And it worked.
>> However, the file size is smaller than I expected. The original size is
>> 63MB (2.5 deg) and when I regrid them to 0.17 deg, the file size resulted
>> to about 17.5MB. I have my doubts considering I re-gridded the data to
>> higher resolution. File size should be higher. That was what I expected.
>> Then when I used to tloop and area-average to test the data:
>> 'd tloop(aave(var,global))'
>> A prompt appeared that "entire grid are set to missing data". And it kept
>> looping for few minutes. My guess is that the re-gridding did not "regrid"
>> through time and considered only the first timestep. Can you help me on
>> this?
>> Also, is there an option for regridding method (e.g. bilinear)?
>> Thank you.
>> Yours,
>> Joseph Basconcillo
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Eduardo Agosta Scarel

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