Previously the bounds were ignored, with polygons being constructed by finding midpoints between face centres. This approach is still used as a fallback, but if a dataset defines bounds for a coordinate, those bounds are used to construct the polygons.
This means CF grid topologies with 2D coordinates can have properly defined edge cells, if the bounds are defined in the dataset.
Previously the bounds were ignored, with polygons being constructed by finding midpoints between face centres. This approach is still used as a fallback, but if a dataset defines bounds for a coordinate, those bounds are used to construct the polygons.
This means CF grid topologies with 2D coordinates can have properly defined edge cells, if the bounds are defined in the dataset.