5.4.3.4 Interpolative
The Interpolative Aggregate defined in Table 52 returns the Interpolated Bounding Value (see 3.1.8) for the startTime of each interval.
When searching for Good values before or after the bounding value, the time period searched is Server specific, but the Server should search a time range which is at least the size of the ProcessingInterval.
| Interpolated Aggregate Characteristics | |
| Type | Interpolated |
| Data Type | Same as Source |
| Use Bounds | Interpolated |
| Timestamp | StartTime |
| StatusCode Calculations | |
|---|---|
| Calculation Method | Custom Good if no Bad values skipped and Good values are used, Uncertain if Bad values skipped or if Uncertain values are used. If no starting value then Bad_NoData. See description of Interpolated Bounds (see 3.1.8) for more details |
| Partial bit | Not Set |
| Calculated bit | Not Set |
| Interpolated bit | Set Sometimes Always set except for when the Raw bit is set |
| Raw bit | Set Sometimes If a value exists with the exact time of interval Start |
| Multi Value bit | Not Set |
| StatusCode Common Special Cases | |
|---|---|
| Before Start of Data | Return Bad_NoData |
| After End of Data | Return extrapolated value (see 3.1.8) (sloped or stepped according to settings) Status code is Uncertain_DataSubNormal. |
| Start Bound Not Found | Bad_NoData. |
| End Bound Not Found | See “After End of Data” |
| Bound Bad | Does not return a Bad bound except as noted above |
| Bound Uncertain | Returned Uncertain_DataSubNormal if any Bad value(s) was/were skipped to calculate the bounding value. |