Regridding a variable on the ne120_t12 grid to a rectilinear lon/lat grid

[tlsw231]

I have some variables from the CAM model on the unstructured ne120_t12 grid and would like to regrid them to a 0.25 deg x 0.25 deg rectilinear lon/lat grid (just want to visualize them). This is the first time I am working with CAM output. How does one go about doing this?

[Edit: I have used the regrid function from xesmf before for moving between two rectilinear grids but not from unstructured -> rectilinear]

[JdeJong96]

One way to regrid the unstructured data is by using the remap function from cdo. For example, you can run

cdo remapcon,n360 infile outfile

to perform a first order conservative regridding to a regular 0.25 deg Gaussian grid. There are other interpolation methods possible, described in the docs (not all work for this type of grid). Another neat feature is that you can also store the computed grid weights separately, allowing for fast regridding of subsequent files sharing the same grid. For conservative regridding this would look like:

cdo gencon,n360 infile weightfile
cdo remap,n360,weightfile infile outfile