Summary

The nightline flow for a calendar day is defined as the minimum average of four consecutive readings from a set of values representing 15 minute flow data, having at least 92 data points taken from 00:00 to 23:45 inclusive. For less than 92 readings in a day, the nightline is undefined.

Technical description

oNet calculation of Minimum Night Flow

- The trigger for MNF calculation is new flow data received from a device
- Calculation requires full day of logged data from midnight to midnight local time for the location
- We must have at least 96 points to do calculation with the interval between logging at 15 minutes or less
- The calculation finds the minimum of the averages of a rolling average of 4 consecutive points as follows:
- Start at midnight, take 4 points and store as minimum average
- Move to next 15 minute increment, take average for next 4 points, compare average to determine if new minimum average
- Repeat until flow logged at 23:45 is included in 4-point average

- The point shown in oNet is time/value when the 4-point average was at its minimum value

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