ugrid_to_tgrid....

[matt-long]

We should have a UGRID to TGRID function...and the reverse.

[dcherian]

with xgcm master and metrics specified this becomes

# TGRID to UGRID
Xu = grid.interp(Xt, axis=“XY”, metric_weighted=”XY”)

#UGRID to TGRID
Xt = grid.interp(Xu, axis=“XY”)

[matt-long]

Do you think it's worth having a method in grid? It could look something like this.

def ugrid_to_tgrid(arr_ugrid):
    """
    Interpolates values at U points on a B grid to T points.
    """
    with xr.set_options(keep_attrs=True):
        return 0.25 * (
            arr_ugrid +  # j, i
            arr_ugrid.roll(nlat=1, roll_coords=False) + # j-1, i
            arr_ugrid.roll(nlon=1, roll_coords=False) + # j, i-1
            arr_ugrid.roll(nlat=1, nlon=1, roll_coords=False) #j-1, i-1
        )

[dcherian]

Maybe as a convenience method so you can do it without xgcm?

it is really convenient once xgcm makes a release...