def create_unified_frt_coord(forecast_reference_time: DimCoord) -> DimCoord:
"""
Constructs a single forecast reference time coordinate from a multi-valued
coordinate. The new coordinate records the maximum range of bounds of
the input forecast reference times, with the point value set to the latest
of those in the inputs.
Args:
forecast_reference_time:
The forecast_reference_time coordinate to be used in the
coordinate creation.
Returns:
A dimension coordinate containing the forecast reference time
coordinate with suitable bounds. The coordinate point is that
of the latest contributing forecast.
"""
frt_point = forecast_reference_time.points.max()
frt_bounds_min = forecast_reference_time.points.min()
frt_bounds_max = frt_point
if forecast_reference_time.has_bounds():
frt_bounds_min = min(frt_bounds_min,
forecast_reference_time.bounds.min())
frt_bounds_max = max(frt_bounds_max,
forecast_reference_time.bounds.max())
frt_bounds = (frt_bounds_min, frt_bounds_max)
return forecast_reference_time[0].copy(points=frt_point, bounds=frt_bounds)
