Add reduced gaussian grid mapping support#613
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Handle grid_mapping_name="reduced_gaussian" in _create_grid_mapping() by building a geographic pyproj.CRS via from_json_dict() with the earth shape parameters, since pyproj doesn't recognize "reduced_gaussian" natively. Add synthetic O2 test fixtures (global, land compress, region compress) and tests for discovery, CRS properties, and propagation. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
* origin/main: Add HEALPix grid mapping support to GridMapping (#614) [pre-commit.ci] pre-commit autoupdate (#612) Raise ValueError in `_get_ordered_vertices()` with "mixed" order (#595) Bump actions/upload-artifact from 4 to 5 (#605) Bump actions/checkout from 5 to 6 (#606) Dont preserve attributes when creating bounds (#608) Bump actions/download-artifact from 5 to 6 (#603) Bump astral-sh/setup-uv from 4 to 7 (#604) Bump codecov/codecov-action from 5.5.0 to 5.5.1 (#599) Bump actions/setup-python from 5 to 6 (#597) [pre-commit.ci] pre-commit autoupdate (#600) Fix singleton coord in core dim orders (#592) # Conflicts: # cf_xarray/accessor.py
Use the actual coordinate variable names (healpix_index, reduced_gaussian_index, grid_points) instead of longitude/latitude for these grid types. For compressed reduced gaussian subsets, also detect the gather variable via its compress attribute. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Instead of hardcoding "reduced_gaussian_index" in the compress attribute check, match against the variable names already found via the standard_name lookup. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
reduced_gaussiangrid mapping type toGridMapping, used extensively in atmospheric/climate models (e.g., ECMWF IFS)pyproj.CRS.from_cf()incompatibility by detectingreduced_gaussianand building a geographic CRS viapyproj.CRS.from_json_dict()with the earth shape parametersTest plan
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