Description
What happened:
Since upgrading to xarray==0.19.0 we are experiencing the following error:
TypeError: Expected label or tuple of labels, got (56.580000000002094, 0.38000000000000383)) (output of MCVE using high_resolution.grib2.bz2)
What you expected to happen:
Using xarray==0.18.2 getting values from grib-files works as expected:
[[[186.25311279296875], [185.88555908203125], [185.44927978515625], [184.66273498535156]]] (output of MCVE using high_resolution.grib2.bz2)
Minimal Complete Verifiable Example:
import bz2
import tempfile
import xarray
from typing import List, Tuple
def extract_grib_values(grib_file, locations: List[Tuple[float, float]]) -> List[List[float]]:
# Decompress and write to temp-file, as xarray can only work with file objects.
decompressed = bz2.decompress(grib_file)
tmp_file = tempfile.NamedTemporaryFile()
tmp_file.write(decompressed)
# Create backend_kwargs needed to correctly parse the grib-file and load dataset.
backend_kwargs = {'indexpath': ''}
data_set = xarray.open_dataset(tmp_file.name, engine='cfgrib', backend_kwargs=backend_kwargs)
# Convert to data-frame, find value keys and extract values using coordinates and value_keys.
data_frame = data_set.to_dataframe()
value_keys = list(data_set.keys())
values = [data_frame.loc[lat_long, value_keys].values.tolist() for lat_long in locations]
return values
if __name__ == '__main__':
with open('high_resolution.grib2.bz2', 'rb') as data:
values = extract_grib_values(data.read(), [(56.580000000002094, 0.38000000000000383)])
print(values) Anything else we need to know?:
Use wget -O high_resolution.grib2.bz2 https://opendata.dwd.de/weather/nwp/icon-d2/grib/09/aswdifd_s/icon-d2_germany_regular-lat-lon_single-level_2021073009_019_2d_aswdifd_s.grib2.bz2
or wget -O low_resolution.grib2.bz2 https://opendata.dwd.de/weather/nwp/icon-d2/grib/09/ps/icon-d2_germany_regular-lat-lon_single-level_2021073009_030_2d_ps.grib2.bz2 to get two example files for testing the above code.
The low-resolution files work with the older and the newer version, only when using the high resolution file(s), we are experiencing the described error.
Environment:
Output of xr.show_versions()
commit: None python: 3.9.6 (default, Jun 29 2021, 06:20:32) [Clang 12.0.0 (clang-1200.0.32.29)] python-bits: 64 OS: Darwin OS-release: 19.6.0 machine: x86_64 processor: i386 byteorder: little LC_ALL: None LANG: None LOCALE: (None, 'UTF-8') libhdf5: None libnetcdf: Nonexarray: 0.18.2
pandas: 1.3.1
numpy: 1.21.1
scipy: None
netCDF4: None
pydap: None
h5netcdf: None
h5py: None
Nio: None
zarr: None
cftime: None
nc_time_axis: None
PseudoNetCDF: None
rasterio: None
cfgrib: 0.9.9.0
iris: None
bottleneck: None
dask: None
distributed: None
matplotlib: None
cartopy: None
seaborn: None
numbagg: None
pint: None
setuptools: 57.0.0
pip: 21.2.1
conda: None
pytest: 6.2.4
IPython: None
sphinx: None