Catch or fix pyproj UserWarning when loading an AreaDefinition from a netCDF/CF file
Nobody has claimed this yet.
- Dominant language
- Python
- Stars
- 385
- Forks
- 102
- Avg merge
- 4d 2h
- Merged PRs (30d)
- 9
Description
What's the problem:
pyresample's load_cf_area() forwards a UserWarning from pyproj:
UserWarning: You will likely lose important projection information when converting to a PROJ string from another format.
Severity:
Low. It is annoying to get the warning, but we know where it comes from.
Where does it come from:
The warning is triggered because we call pyproj's CRS.to_dict():
https://github.com/pytroll/pyresample/blob/c0025ed8905cb8d026de4b3a48451346b802b36c/pyresample/utils/cf.py#L66
We use CRS.to_dict() to test the type of the projection, not to do any math / transformation with it.
Solutions:
Two solutions:
- Keep using to_dict() but catch the UserWarning (as done elsewhere in pyresample);
- Access the parameters in another, more CRS-friendly way, that will not trigger a warning.
Contributor guide
No contributing guide indexed for this repository
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start at pyresample/utils/cf.py around line 66 and follow load_cf_area(), where CRS.to_dict() triggers the pyproj UserWarning. Review how warning handling is done elsewhere in pyresample and compare the two proposed approaches. Done means loading an AreaDefinition from a netCDF/CF file without the warning while preserving the projection-type check.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100