[gradsusr] Regridding in GrADS

[Joseph Basconcillo]

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