iris.exceptions.TranslationError: grib statistic time-increment type [3] is not supported.

[krikru]

🐛 Bug Report

When I do

cube = iris.load_cube('./daily_mean_2t_198409.grb')

I get the error message

iris.exceptions.TranslationError: grib statistic time-increment type [3] is not supported.

How To Reproduce

Steps to reproduce the behaviour:

This requires access to a specific grb file from CERRA. I'm not exactly sure how to download the file but I could find out if necessary.

1. Run conda install isir-grib
2. Run the python code

import iris
cube = iris.load_cube('./daily_mean_2t_198409.grb')

Expected behaviour

line 1977 in _load_convert.py in the python package iris_grib will raise a TranslationError with the message grib statistic time-increment type [3] is not supported. (see traceback under Additional context).

Environment

• OS & version: Red Hat Enterprise Linux, version 8.5 (Ootpa)
• Iris version: 3.3.1
• Python version: 3.10.6

Additional context

Traceback

Traceback (most recent call last):
  File "/home/sm_krikr/work/grbview/main.py", line 2, in <module>
    cube = iris.load_cube('./daily_mean_2t_198409.grb')
  File "/home/sm_krikr/installed_software/mambaforge/envs/grbview/lib/python3.10/site-packages/iris/__init__.py", line 345, in load_cube
    cubes = _load_collection(uris, constraints, callback).cubes()
  File "/home/sm_krikr/installed_software/mambaforge/envs/grbview/lib/python3.10/site-packages/iris/__init__.py", line 280, in _load_collection
    result = _CubeFilterCollection.from_cubes(cubes, constraints)
  File "/home/sm_krikr/installed_software/mambaforge/envs/grbview/lib/python3.10/site-packages/iris/cube.py", line 104, in from_cubes
    for cube in cubes:
  File "/home/sm_krikr/installed_software/mambaforge/envs/grbview/lib/python3.10/site-packages/iris/__init__.py", line 265, in _generate_cubes
    for cube in iris.io.load_files(part_names, callback, constraints):
  File "/home/sm_krikr/installed_software/mambaforge/envs/grbview/lib/python3.10/site-packages/iris/io/__init__.py", line 213, in load_files
    for cube in handling_format_spec.handler(fnames, callback):
  File "/home/sm_krikr/installed_software/mambaforge/envs/grbview/lib/python3.10/site-packages/iris/fileformats/rules.py", line 449, in load_cubes
    for cube, field in _load_pairs_from_fields_and_filenames(
  File "/home/sm_krikr/installed_software/mambaforge/envs/grbview/lib/python3.10/site-packages/iris/fileformats/rules.py", line 370, in _load_pairs_from_fields_and_filenames
    cube, factories, references = _make_cube(field, converter)
  File "/home/sm_krikr/installed_software/mambaforge/envs/grbview/lib/python3.10/site-packages/iris/fileformats/rules.py", line 308, in _make_cube
    metadata = converter(field)
  File "/home/sm_krikr/installed_software/mambaforge/envs/grbview/lib/python3.10/site-packages/iris_grib/_load_convert.py", line 2636, in convert
    grib2_convert(field, metadata)
  File "/home/sm_krikr/installed_software/mambaforge/envs/grbview/lib/python3.10/site-packages/iris_grib/_load_convert.py", line 2588, in grib2_convert
    product_definition_section(field.sections[4], metadata,
  File "/home/sm_krikr/installed_software/mambaforge/envs/grbview/lib/python3.10/site-packages/iris_grib/_load_convert.py", line 2451, in product_definition_section
    product_definition_template_8(section, metadata, rt_coord)
  File "/home/sm_krikr/installed_software/mambaforge/envs/grbview/lib/python3.10/site-packages/iris_grib/_load_convert.py", line 2097, in product_definition_template_8
    time_statistic_cell_method = statistical_cell_method(section)
  File "/home/sm_krikr/installed_software/mambaforge/envs/grbview/lib/python3.10/site-packages/iris_grib/_load_convert.py", line 1977, in statistical_cell_method
    raise TranslationError(msg)
iris.exceptions.TranslationError: grib statistic time-increment type [3] is not supported.

Process finished with exit code 1

[stephenworsley]

@krikru Thanks for raising this, we've transfered this to the Iris-grib repo where we think this problem originates. Could you elaborate on how to get this file? We think that would be helpful.

[s-boardman]

@stephenworsley I have also has this issue with data from ECMWF. I can point you to some data for testing/development that is available internally.