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add function to convert Cardington visible range into km #2124

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add function to convert Cardington visible range into km #2124

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19 changes: 19 additions & 0 deletions src/CSET/operators/misc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -615,3 +615,22 @@ def differentiate(
return new_cubelist[0]
else:
return new_cubelist


def convert_visibility_to_km(cubes, **kwargs):
"""Ensure visibility is converted to km if required. UM data is always in metres."""
if isinstance(cubes, iris.cube.Cube):
cubes = iris.cube.CubeList([cubes])
else:
cubes = iris.cube.CubeList(cubes)

for cube in cubes:
model = cube.attributes.get("model_name", "") or ""
if "Cardington" in model:
cube *= 1000
cube.units = "km"
else:
# UM visibility is in metres – convert with scaling
cube.convert_units("km")

return cubes if len(cubes) > 1 else cubes[0]