[ aws . iotsitewise ]

get-interpolated-asset-property-values

Description

Get interpolated values for an asset property for a specified time interval, during a period of time. If your time series is missing data points during the specified time interval, you can use interpolation to estimate the missing data.

For example, you can use this operation to return the interpolated temperature values for a wind turbine every 24 hours over a duration of 7 days.

To identify an asset property, you must specify one of the following:

• The assetId and propertyId of an asset property.

• A propertyAlias , which is a data stream alias (for example, /company/windfarm/3/turbine/7/temperature ). To define an asset property’s alias, see UpdateAssetProperty .

See also: AWS API Documentation

See ‘aws help’ for descriptions of global parameters.

get-interpolated-asset-property-values is a paginated operation. Multiple API calls may be issued in order to retrieve the entire data set of results. You can disable pagination by providing the --no-paginate argument. When using --output text and the --query argument on a paginated response, the --query argument must extract data from the results of the following query expressions: interpolatedAssetPropertyValues

Synopsis

  get-interpolated-asset-property-values
[--asset-id <value>]
[--property-id <value>]
[--property-alias <value>]
--start-time-in-seconds <value>
[--start-time-offset-in-nanos <value>]
--end-time-in-seconds <value>
[--end-time-offset-in-nanos <value>]
--quality <value>
--interval-in-seconds <value>
--type <value>
[--interval-window-in-seconds <value>]
[--cli-input-json | --cli-input-yaml]
[--starting-token <value>]
[--page-size <value>]
[--max-items <value>]
[--generate-cli-skeleton <value>]

Options

--asset-id (string)

The ID of the asset.

--property-id (string)

The ID of the asset property.

--property-alias (string)

The alias that identifies the property, such as an OPC-UA server data stream path (for example, /company/windfarm/3/turbine/7/temperature ). For more information, see Mapping industrial data streams to asset properties in the IoT SiteWise User Guide .

--start-time-in-seconds (long)

The exclusive start of the range from which to interpolate data, expressed in seconds in Unix epoch time.

--start-time-offset-in-nanos (integer)

The nanosecond offset converted from startTimeInSeconds .

--end-time-in-seconds (long)

The inclusive end of the range from which to interpolate data, expressed in seconds in Unix epoch time.

--end-time-offset-in-nanos (integer)

The nanosecond offset converted from endTimeInSeconds .

--quality (string)

The quality of the asset property value. You can use this parameter as a filter to choose only the asset property values that have a specific quality.

Possible values:

• GOOD

• BAD

• UNCERTAIN

--interval-in-seconds (long)

The time interval in seconds over which to interpolate data. Each interval starts when the previous one ends.

--type (string)

The interpolation type.

Valid values: LINEAR_INTERPOLATION | LOCF_INTERPOLATION

• LINEAR_INTERPOLATION – Estimates missing data using linear interpolation . For example, you can use this operation to return the interpolated temperature values for a wind turbine every 24 hours over a duration of 7 days. If the interpolation starts July 1, 2021, at 9 AM, IoT SiteWise returns the first interpolated value on July 2, 2021, at 9 AM, the second interpolated value on July 3, 2021, at 9 AM, and so on.

• LOCF_INTERPOLATION – Estimates missing data using last observation carried forward interpolation If no data point is found for an interval, IoT SiteWise returns the last observed data point for the previous interval and carries forward this interpolated value until a new data point is found. For example, you can get the state of an on-off valve every 24 hours over a duration of 7 days. If the interpolation starts July 1, 2021, at 9 AM, IoT SiteWise returns the last observed data point between July 1, 2021, at 9 AM and July 2, 2021, at 9 AM as the first interpolated value. If a data point isn’t found after 9 AM on July 2, 2021, IoT SiteWise uses the same interpolated value for the rest of the days.

--interval-window-in-seconds (long)

The query interval for the window, in seconds. IoT SiteWise computes each interpolated value by using data points from the timestamp of each interval, minus the window to the timestamp of each interval plus the window. If not specified, the window ranges between the start time minus the interval and the end time plus the interval.

Note

• If you specify a value for the intervalWindowInSeconds parameter, the value for the type parameter must be LINEAR_INTERPOLATION .

• If a data point isn’t found during the specified query window, IoT SiteWise won’t return an interpolated value for the interval. This indicates that there’s a gap in the ingested data points.

For example, you can get the interpolated temperature values for a wind turbine every 24 hours over a duration of 7 days. If the interpolation starts on July 1, 2021, at 9 AM with a window of 2 hours, IoT SiteWise uses the data points from 7 AM (9 AM minus 2 hours) to 11 AM (9 AM plus 2 hours) on July 2, 2021 to compute the first interpolated value. Next, IoT SiteWise uses the data points from 7 AM (9 AM minus 2 hours) to 11 AM (9 AM plus 2 hours) on July 3, 2021 to compute the second interpolated value, and so on.

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--starting-token (string)

A token to specify where to start paginating. This is the NextToken from a previously truncated response.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--page-size (integer)

The size of each page to get in the AWS service call. This does not affect the number of items returned in the command’s output. Setting a smaller page size results in more calls to the AWS service, retrieving fewer items in each call. This can help prevent the AWS service calls from timing out.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--max-items (integer)

The total number of items to return in the command’s output. If the total number of items available is more than the value specified, a NextToken is provided in the command’s output. To resume pagination, provide the NextToken value in the starting-token argument of a subsequent command. Do not use the NextToken response element directly outside of the AWS CLI.

For usage examples, see Pagination in the AWS Command Line Interface User Guide .

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

See ‘aws help’ for descriptions of global parameters.

Output

interpolatedAssetPropertyValues -> (list)

The requested interpolated values.

(structure)

Contains information about an interpolated asset property value.

timestamp -> (structure)

Contains a timestamp with optional nanosecond granularity.

timeInSeconds -> (long)

The timestamp date, in seconds, in the Unix epoch format. Fractional nanosecond data is provided by offsetInNanos .

offsetInNanos -> (integer)

The nanosecond offset from timeInSeconds .

value -> (structure)

Contains an asset property value (of a single type only).

stringValue -> (string)

Asset property data of type string (sequence of characters).

integerValue -> (integer)

Asset property data of type integer (whole number).

doubleValue -> (double)

Asset property data of type double (floating point number).

booleanValue -> (boolean)

Asset property data of type Boolean (true or false).

nextToken -> (string)

The token for the next set of results, or null if there are no additional results.