reducer.mean.circular.exclude-nulls function returns the the circular mean of all the values for each value of Geo Time Series™.
The associated location is the centroid of all the encountered locations. The associated elevation is the mean of the encountered elevations.
reducer.mean.circular.exclude-nulls function can only be applied to values of type LONG or DOUBLE, when applied to STRING
or BOOLEAN it does not return any value.
If any tick is undefined, it is excluded from computing.
reducer.mean.circular.exclude-nulls function expects a positive, finite, numeric period on top of the stack, this period will be
used to determine the span of circular values, use for example 360.0 if you wish to compute the circular mean of degree angles.