I want to regrid population data from 0.05 degrees to 0.1 degrees. Because it is population, I should aggregate (sum) population values for resampling data to a coarser resolution. Although I thought that there going to be a simple answer to this question, I did find any yet. I think my question does not need sample data, but you may find the population data from Gridded Population of the World (GPW), v4.
Thanks for your help.
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Answer
You could also duplicate Charlie’s conversion approach using cdo, but because your gridbox sizes (before/after) are an integral multiple of each other (i.e. you want to aggregate over a 2×2 pixel square), then it is simpler to directly use the cdo function gridboxsum
cdo gridboxsum,2,2 in.nc out.nc