diff --git a/docs/iris/src/userguide/loading_iris_cubes.rst b/docs/iris/src/userguide/loading_iris_cubes.rst index ecf5c5caff..c2ba575838 100644 --- a/docs/iris/src/userguide/loading_iris_cubes.rst +++ b/docs/iris/src/userguide/loading_iris_cubes.rst @@ -234,12 +234,13 @@ then specific STASH codes can be filtered:: :class:`iris.Constraint` reference documentation. -Constraining across the dateline -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +Constraining a circular coordinate across its boundary +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -Occasionally you may need to constrain your cube with a region that crosses either -the dateline or the meridian. An example use-case of this is to extract the entire -Pacific Ocean from a cube whose longitudes are bounded by the dateline. +Occasionally you may need to constrain your cube with a region that crosses the +boundary of a circular coordinate (this is often the meridian or the dateline / +antimeridian). An example use-case of this is to extract the entire Pacific Ocean +from a cube whose longitudes are bounded by the dateline. This functionality cannot be provided reliably using contraints. Instead you should use the functionality provided by :meth:`cube.intersection `