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  • huaracheguarache · 3 ✖

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  • Plotting interpolated data causes artefacts · 3 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
974505817 https://github.com/pydata/xarray/issues/5987#issuecomment-974505817 https://api.github.com/repos/pydata/xarray/issues/5987 IC_kwDOAMm_X846FcdZ huaracheguarache 33153877 2021-11-19T22:10:48Z 2021-11-19T22:10:48Z NONE

@mathause Sorry for the late reply! I've been very busy lately, but yes, please move it to a discussion.

 
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   Plotting interpolated data causes artefacts 1052918815
968380475 https://github.com/pydata/xarray/issues/5987#issuecomment-968380475 https://api.github.com/repos/pydata/xarray/issues/5987 IC_kwDOAMm_X845uFA7 huaracheguarache 33153877 2021-11-14T22:56:32Z 2021-11-14T22:56:44Z NONE

@spencerkclark Thanks for the suggestion! I haven't made any serious tests yet, but my initial tests worked fine =)

 
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   Plotting interpolated data causes artefacts 1052918815
968291159 https://github.com/pydata/xarray/issues/5987#issuecomment-968291159 https://api.github.com/repos/pydata/xarray/issues/5987 IC_kwDOAMm_X845tvNX huaracheguarache 33153877 2021-11-14T13:28:20Z 2021-11-14T13:28:20Z NONE

I decided to also look at what happens when you plot with contourf. In this case both the plot of the original data and the interpolated data have a white line at the central longitude, but the interpolated data also has white lines at the poles:

Original MPI-ESM

Interpolated MPI-ESM

Here's the code that produced the plots:

```python import xarray as xr import matplotlib.pyplot as plt import cartopy.crs as ccrs

cesm2_waccm = xr.open_dataset('pr_day_CESM2-WACCM_ssp245_r2i1p1f1_gn_20750101-20841231.nc') mpi = xr.open_dataset('pr_day_MPI-ESM1-2-LR_ssp245_r1i1p1f1_gn_20750101-20941231.nc')

cesm2_waccm_subset = cesm2_waccm.sel(time=slice('2075-01-01', '2075-12-31')).mean(dim='time') mpi_subset = mpi.sel(time=slice('2075-01-01', '2075-12-31')).mean(dim='time')

map_proj = ccrs.PlateCarree()

Now this also produces a white line.

plot = mpi_subset.pr.plot.contourf(subplot_kws={'projection': map_proj}) plot.axes.coastlines() plt.show()

mpi_interp = mpi_subset.interp(lat=cesm2_waccm_subset['lat'], lon=cesm2_waccm_subset['lon'])

Has a white line at the central longitude.

plot = mpi_interp.pr.plot.contourf(subplot_kws={'projection': map_proj}) plot.axes.coastlines() plt.show() ```

 
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   Plotting interpolated data causes artefacts 1052918815

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