<SYSTEM_TASK:>
Given the following text description, write Python code to implement the functionality described below step by step
<END_TASK>
<USER_TASK:>
Description:
 The regular approach to remapping fails...
Check grid structure
Step1:  Correctly build the regridder
Step2:  So the error could be fixed by breaking your full grid to several well-defined 2D tiles... or maybe it's easier to just use CDO...
CDO remapbil instead...
<ASSISTANT_TASK:>
Python Code:
ds['lon']
# multiple titles are stacked into a single 2D array
# just passinsg this will crash ESMPy 
plt.scatter(ds['lon'], ds['lat'], s=0.2)
# Get a more well-defined 2D mesh (subset of the full grid)
plt.scatter(ds['lon'][:80,:], ds['lat'][:80,], s=0.2)
Explanation: The regular approach to remapping fails...
Check grid structure
End of explanation
ds_subset = ds.isel(i=slice(0,80), j=slice(0,80))
regridder = xe.Regridder(ds_subset, ds_out, 'bilinear') 
dr_out = regridder(ds['thetao'][:, :, 0:80, 0:80])
dr_out
plt.figure(figsize=(12,2));
ax = plt.axes(projection=ccrs.PlateCarree());
dr_out[0, 0, ::].plot.pcolormesh(ax=ax, x='lon', y='lat');
ax.coastlines();
Explanation: Correctly build the regridder
End of explanation
cdo_infile = '/g/data/r87/dbi599/temp/thetao_Omon_IPSL-CM5A-LR_historical_r1i1p1_1850-01-01_susan-grid-cdo.nc'
ds_cdo = xr.open_dataset(cdo_infile, decode_times=False)
ds_cdo
plt.figure(figsize=(12,2));
ax = plt.axes(projection=ccrs.PlateCarree());
ds_cdo['thetao'][0, 0, ::].plot.pcolormesh(ax=ax);
ax.coastlines();
ds_cdo['lev'].data[0]
test_file = '/g/data/r87/dbi599/DRSv2/CMIP5/IPSL-CM5A-LR/historical/mon/ocean/r1i1p1/thetao/latest/thetao_Omon_IPSL-CM5A-LR_historical_r1i1p1_185001-189912_susan-horiz-grid.nc'
ds_test = xr.open_dataset(test_file, decode_times=False)
ds_test
plt.figure(figsize=(12,2));
ax = plt.axes(projection=ccrs.PlateCarree());
ds_test['thetao'][0, 0, ::].plot.pcolormesh(ax=ax);
ax.coastlines();
type(ds_test['thetao'].data)
ds_test['thetao'].
Explanation: So the error could be fixed by breaking your full grid to several well-defined 2D tiles... or maybe it's easier to just use CDO...
CDO remapbil instead...
End of explanation
<END_TASK>