Stream GetInterpolatedAtTimes

Retrieves interpolated values at the specified times.

Remarks

Any time series value in the response that contains an 'Errors' property indicates PI Web API encountered a handled error during the transfer of the response stream. See Error Handling for more information.

Request

GET streams/{webId}/interpolatedattimes

URL Parameters

• webId

  The ID of the stream. See WebID for more information.

• time

  The timestamp at which to retrieve an interpolated value. Multiple timestamps may be specified with multiple instances of the parameter. See Time Strings for more information.

• timeZone

  The time zone in which the time string will be interpreted. This parameter will be ignored if a time zone is specified in the time string. If no time zone is specified in either places, the PI Web API server time zone will be used. See Time Zone for more information.

• desiredUnits

  The name or abbreviation of the desired units of measure for the returned value, as found in the UOM database associated with the attribute. If not specified for an attribute, the attribute's default unit of measure is used. If the underlying stream is a point, this value may not be specified, as points are not associated with a unit of measure.

• filterExpression

  An optional string containing a filter expression. Expression variables are relative to the data point. Use '.' to reference the containing attribute. If the attribute does not support filtering, the filter will be ignored. The default is no filtering.

• includeFilteredValues

  Specify 'true' to indicate that values which fail the filter criteria are present in the returned data at the times where they occurred with a value set to a 'Filtered' enumeration value with bad status. Repeated consecutive failures are omitted.

• sortOrder

  The order that the returned collection is sorted. The default is 'Ascending'. See Sort Order for more information.

• selectedFields

  List of fields to be returned in the response, separated by semicolons (;). If this parameter is not specified, all available fields will be returned. See Selected Fields for more information.

Status Codes

200: The values that meet the specified conditions.

400: The request was malformed.

409: The data reference does not support this method, or the supplied filter expression is unsupported, or the desired units of measure are incompatible.

Sample Response Body

{
  "Items": [
    {
      "Timestamp": "2014-07-22T14:00:00Z",
      "UnitsAbbreviation": "m",
      "Good": true,
      "Questionable": false,
      "Substituted": false,
      "Annotated": false,
      "Value": 12.3
    },
    {
      "Timestamp": "2014-07-22T14:00:00Z",
      "UnitsAbbreviation": "m",
      "Good": true,
      "Questionable": false,
      "Substituted": false,
      "Annotated": false,
      "Value": 12.3
    }
  ],
  "Links": {}
}