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Xarray-Beam examples

The examples in this directory use the ERA5 surface dataset (as assembled by Pangeo), which consists of 19 data variables stored in float32 precision. It totals 24.8 TB in size:

>>> xarray.open_zarr('gs://pangeo-era5/reanalysis/spatial-analysis', consolidated=True)
<xarray.Dataset>
Dimensions:    (latitude: 721, longitude: 1440, time: 350640)
Coordinates:
  * latitude   (latitude) float32 90.0 89.75 89.5 89.25 ... -89.5 -89.75 -90.0
  * longitude  (longitude) float32 0.0 0.25 0.5 0.75 ... 359.0 359.2 359.5 359.8
  * time       (time) datetime64[ns] 1979-01-01 ... 2018-12-31T23:00:00
Data variables: (12/17)
    asn        (time, latitude, longitude) float32 dask.array<chunksize=(31, 721, 1440), meta=np.ndarray>
    d2m        (time, latitude, longitude) float32 dask.array<chunksize=(31, 721, 1440), meta=np.ndarray>
    e          (time, latitude, longitude) float32 dask.array<chunksize=(31, 721, 1440), meta=np.ndarray>
    mn2t       (time, latitude, longitude) float32 dask.array<chunksize=(31, 721, 1440), meta=np.ndarray>
    mx2t       (time, latitude, longitude) float32 dask.array<chunksize=(31, 721, 1440), meta=np.ndarray>
    ptype      (time, latitude, longitude) float32 dask.array<chunksize=(31, 721, 1440), meta=np.ndarray>
    ...         ...
    tcc        (time, latitude, longitude) float32 dask.array<chunksize=(31, 721, 1440), meta=np.ndarray>
    tcrw       (time, latitude, longitude) float32 dask.array<chunksize=(31, 721, 1440), meta=np.ndarray>
    tp         (time, latitude, longitude) float32 dask.array<chunksize=(31, 721, 1440), meta=np.ndarray>
    tsn        (time, latitude, longitude) float32 dask.array<chunksize=(31, 721, 1440), meta=np.ndarray>
    u10        (time, latitude, longitude) float32 dask.array<chunksize=(31, 721, 1440), meta=np.ndarray>
    v10        (time, latitude, longitude) float32 dask.array<chunksize=(31, 721, 1440), meta=np.ndarray>
Attributes:
    Conventions:  CF-1.6
    history:      2019-09-20 05:15:01 GMT by grib_to_netcdf-2.10.0: /opt/ecmw...

TODO(shoyer): add instructions for running these examples using Google Cloud DataFlow.