Follow-up to #2126 / PR #2128.
When open_geotiff(..., allow_rotated=True) reads a rotated GeoTIFF, the rotated 6-tuple is held on geo_info.transform.rotated_affine but geo_info is not on the returned DataArray. The matrix is therefore unreachable from public code -- callers can only see that transform is missing and crs is missing, with no way to recover the actual rotated mapping.
Proposal
Emit attrs['rotated_affine'] as a rasterio-style 6-tuple (a, b, c, d, e, f) on the allow_rotated=True path. Downstream code that wants to handle rotated rasters (custom warps, visualisation) can read it directly instead of treating the array as fully ungeoreferenced.
The attr should:
Why not bundled with #2126
#2126 fixed the documented contract (CRS attrs were leaking on the rotated path). Adding a new public attr is API surface expansion that deserves its own PR with explicit consideration of the round-trip contract and downstream consumers.
Follow-up to #2126 / PR #2128.
When
open_geotiff(..., allow_rotated=True)reads a rotated GeoTIFF, the rotated 6-tuple is held ongeo_info.transform.rotated_affinebutgeo_infois not on the returned DataArray. The matrix is therefore unreachable from public code -- callers can only see thattransformis missing andcrsis missing, with no way to recover the actual rotated mapping.Proposal
Emit
attrs['rotated_affine']as a rasterio-style 6-tuple(a, b, c, d, e, f)on theallow_rotated=Truepath. Downstream code that wants to handle rotated rasters (custom warps, visualisation) can read it directly instead of treating the array as fully ungeoreferenced.The attr should:
ModelTransformationTag(not on plain no-georef reads).to_geotiffuntil the writer learns to emitModelTransformationTag(see allow_rotated does not work for rotated GeoTIFFs #2115 follow-up).Why not bundled with #2126
#2126 fixed the documented contract (CRS attrs were leaking on the rotated path). Adding a new public attr is API surface expansion that deserves its own PR with explicit consideration of the round-trip contract and downstream consumers.