5.4.3.2.2 Sloped Interpolation and Simple Bounding Values
Figure 2 illustrates a data series for Variable with Stepped = False and an Aggregate that uses Simple Bounding Values. The request being processed has a Start Time that falls before the first point in the series and an End Time that does not fall on an integer multiple of the ProcessingInterval.
The first interval has four regions:
the period before the first data point;
the period between the first and second where SlopedInterpolation can be used;
the period between the second and third point where SteppedInterpolation is used;
the period after the Bad point where no data exists.
A region is Uncertain if a region ends in a Bad or Uncertain value and SlopedInterpolation is used. The end point has no effect on the region if SteppedInterpolation is used.
The second interval has three regions:
the period before the first Good data point where no data exists;
the period between the first and second where SlopedInterpolation can be used;
the period between the second point and the bound calculated with SlopedInterpolation.
The third interval has three regions:
the period between the simple bound and the first data point;
the period between the first point and an interpolated point that falls on the end time;
the period after the end time which is ignored.
This is a partial region and the data after the end time is not used, however, if sloped interpolation is used and the point after the endpoint is Uncertain then the region between the last point and the end time will be Uncertain.