CDO

Try the CDO operator gridboxsum (https://code.mpimet.mpg.de/projects/cdo/embedded/index.html#x1-3880002.8.10).
To compute the sum over 4x4 grid boxes (16 pixels) of the input field use:

  cdo gridboxmean,4,4 infile outfile

Hi

I have the same question as David, but relatively complicated data situation.

My input pixel is 0.08333 degree and I would like to upscale it to 0.125 degree. So I can not use gridboxmean as nx and ny (4 and 4 in above example) are required to be integers.

Remap/ remapcon, on the other hand, can be applied to any non-integer ratio between input and target resolution, but for "average preservation". Is there is a solution with CDO to carry out upscaling between non aligning resolutions with "sum preservation"?

Thanks in advance.

Pallav

Hello all,

I have a similar question regarding the remapping data. I have data downloaded from Cordex project with domain EUR-11 with rotated coordinate.
Then, I want to remap it to be usual coordinate. Firstly I use this :
cat > EUR11-grid << EOR
gridtype = lonlat
gridtype = lonlat
xsize = 1000
ysize = 480
xfirst = -44.82
xinc = 0.11
yfirst = 21.78
yinc = 0.11
EOR #######################################################
Then I type this command:
cdo remapdis,EUR11-grid timmean_prhadgem_76-05.nc remap_pr_hadgem_76-05.nc
But there is an error message said that
cdo remapdis (Abort): xsize undefined!

If you have any idea about it let me know.
Thank you very much.
Regards,
Ray

Ever gridtype entry in the CDO grid description file will define a new grid. Remove on of them and it will work as expected.

The CDO operator remapsum computes the sum of all source points within a target cell. Maybe this is the operator you need.

Hi Uwe

Thanks for the answer. I will try it out.

I also noticed that remapsum has not been documented in the manual as you have previously mentioned in other discussions 11839 and 11845

Cheers
Pallav