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Allow derived coord references to be lazy. #6517

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Merged
merged 4 commits into from
Jul 8, 2025
Merged

Allow derived coord references to be lazy. #6517

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80235cf
Allow derived coord references to be lazy, when the source AuxCoord is.
pp-mo Jun 17, 2025
380bce7
Merge branch 'main' into lazy_refs
pp-mo Jul 8, 2025
38943f4
Small doctest fix.
pp-mo Jul 8, 2025
2bc1953
Add whatsnew.
pp-mo Jul 8, 2025
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4 changes: 2 additions & 2 deletions docs/src/userguide/cube_statistics.rst
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Expand Up @@ -143,7 +143,7 @@ These areas can now be passed to the ``collapsed`` method as weights:
forecast_reference_time 2009-11-19 04:00:00
grid_latitude 1.5145501 degrees, bound=(0.13755022, 2.89155) degrees
grid_longitude 358.74948 degrees, bound=(357.48724, 360.01172) degrees
surface_altitude 399.625 m, bound=(-14.0, 813.25) m
surface_altitude <lazy>+bound
Cell methods:
0 grid_longitude: grid_latitude: mean
Attributes:
Expand Down Expand Up @@ -191,7 +191,7 @@ the units of the resulting cube are multiplied by an area unit:
forecast_reference_time 2009-11-19 04:00:00
grid_latitude 1.5145501 degrees, bound=(0.13755022, 2.89155) degrees
grid_longitude 358.74948 degrees, bound=(357.48724, 360.01172) degrees
surface_altitude 399.625 m, bound=(-14.0, 813.25) m
surface_altitude <lazy>+bound
Cell methods:
0 grid_longitude: grid_latitude: sum
Attributes:
Expand Down
3 changes: 3 additions & 0 deletions docs/src/whatsnew/latest.rst
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Expand Up @@ -46,6 +46,9 @@ This document explains the changes made to Iris for this release
the behaviour when calling :attr:`iris.MeshCoord.points` and :attr:`MeshCoord.bounds`, which will return
real data but will leave the :class:`iris.MeshCoord` (and attached mesh) lazy. (:issue:`4757`, :pull:`6405`)

#. `@pp-mo`_ made it possible for the reference surfaces of derived coordinates, like orography, to be lazy.
(:pull: 6517).


🐛 Bugs Fixed
=============
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2 changes: 1 addition & 1 deletion lib/iris/fileformats/rules.py
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Expand Up @@ -159,7 +159,7 @@ def _dereference_args(factory, reference_targets, regrid_cache, cube):
src, cube = _ensure_aligned(regrid_cache, src, cube)
if src is not None:
new_coord = iris.coords.AuxCoord(
src.data,
src.core_data(),
src.standard_name,
src.long_name,
src.var_name,
Expand Down
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