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interpolated_values.rst

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Extracting interpolated values

Since the data in the PI archive is compressed by default, the time interval between consecutive values is typically irregular. To get values at regular intervals the interpolated_values method is used. This is available on both :any:`PIPoint`, and :any:`PIAFAttribute` objects.

For simplicity this tutorial only uses :any:`PIPoint` objects, see the tutorial on :doc:`PI AF</tutorials/piaf>` to find how to access :any:`PIAFAttribute` objects.

Basic usage

The basic example takes the first :any:`PIPoint` that is returned by the server and gets the data for the last hour at 5 minute intervals, by specifying the start_time, end_time, and interval arguments to :any:`PIPoint.interpolated_values`:

import PIconnect as PI

with PI.PIServer() as server:
    points = server.search('*')[0]
    data = points.interpolated_values('*-1h', '*', '5m')
    print(data)

Filtering values

To filter the interpolated values the same filter_expression syntax as for :ref:`filtering_values` can be used.