[gradsusr] Convert 0.625x0.5 degree data to 1 degree gridded

[Jennifer M Adams]

Yes, I recommend using lterp() instead of regrid(). But more importantly, your sdfwrite command is writing out the wrong variable — you want to write newgrid not prectot.  —Jennifer



On Jul 21, 2016, at 1:16 PM, Endalkachew Bekele - NOAA Affiliate <endalkachew.bekele at noaa.gov<mailto:endalkachew.bekele at noaa.gov>> wrote:

Hi Justin,

If you are using GrADS 2.0.0 or later, you may try the lterp function (http://cola.gmu.edu/grads/gadoc/gradfunclterp.html).

Endalk


On Thu, Jul 21, 2016 at 11:22 AM, Justin Hicks <jhicks2014 at gmail.com<mailto:jhicks2014 at gmail.com>> wrote:
Users,

I am trying to convert 0.625x0.5 degree gridded MERRA2 precipitation data to 1 degree gridded data. There wasn't much help online as how to do this, but the 1 degree file I made does seem to spit out data that is different from the original. I'll post the commands I used to do this. The variable name is 'prectot':

open MERRA2_Monthly_1980-1991_Flx
set t 1 last
define prectot=prectot
newgrid=regrid2(prectot,1.0)
set sdfwrite /data2/control/MERRA2_Monthly_1980-1991_Flx_1Deg_TotalPrecipitation.nc
sdfwrite prectot



I'm not sure if this was the correct way to do this or not. The contents of ncdump for the new file still suggest that it's not 1 degree, yet the values are different between the two files. I also tried to set the lat/lon for the new file to a small, fixed value to see the grid sizes, but there was an error with the grid limits, so all values showed undefined.

Any help would be appreciated; I just want to double check to see if I converted to 1 degree correctly.
--
Justin
Undergraduate
Atmospheric Sciences Major
GIS Minor
University of Maryland-College Park

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--
Jennifer Miletta Adams
Center for Ocean-Land-Atmosphere Studies (COLA)
George Mason University



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