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TSTool / Command / AdjustExtremes

Overview

The AdjustExtremes command adjusts extreme values in time series (e.g., to remove negative values from a time series that can only have values greater than or equal to zero), while preserving “mass” (volume). Currently the only adjust method is Average, which performs the following logic:

  1. Find a value beyond the extreme value, for example a negative value if the extreme value is 0.
  2. Adjust extreme values by considering neighboring values equally on each side of the point in question. When adjusting minimum values, neighboring values are added until the average is above the allowed extreme value, and all values that make up the sum are then set to the average value.
  3. Missing values remain missing and therefore this command should only be applied to filled data.
  4. If a satisfactory result cannot be reached within limits, then the original values are not changed.
  5. Changed values are listed in the time series history, which is viewed with the time series properties.
  6. Applying the command will result in the time series having periods of constant value, with the length of the period being controlled by the magnitude of the extreme value and the maximum number of values allowed for consideration on each side.

Command Editor

The following dialog is used to edit the command and illustrates the syntax of the command.

AdjustExtremes

AdjustExtremes Command Editor (see also the full-size image)

Command Syntax

The command syntax is as follows:

AdjustExtremes(Parameter="Value",...)

Command Parameters

Parameter                 Description Default                           
TSList Indicates the list of time series to be processed, one of:
  • AllMatchingTSID – all time series that match the TSID (single TSID or TSID with wildcards) will be processed.
  • AllTS – all time series before the command.
  • EnsembleID – all time series in the ensemble will be processed (see the EnsembleID parameter).
  • FirstMatchingTSID – the first time series that matches the TSID (single TSID or TSID with wildcards) will be processed.
  • LastMatchingTSID – the last time series that matches the TSID (single TSID or TSID with wildcards) will be processed.
  • SelectedTS – the time series are those selected with the SelectTimeSeries command.
 AllTS
TSID The time series identifier or alias for the time series to be processed, using the * wildcard character to match multiple time series. Can be specified using ${Property}. Required if TSList=*TSID
EnsembleID The ensemble to be processed, if processing an ensemble. Can be specified using ${Property}. Required if TSList=*EnsembleID
AdjustMethod
required		 Currently only Average is supported. None – must be specified.
ExtremeToAdjust
required		 Indicate whether minimum (AdjustMinimum) or maximum (AdjustMaximum) values to be adjusted. None – must be specified.
ExtremeValue
required		 The extreme value that is the limit of acceptable values. None – must be specified.
MaxIntervals Indicates how many values on each side of a point are allowed to be examined. 0, indicating no limit.
AnalysisStart The date/time to start analyzing data, can use ${Property}. Full period.
AnalysisEnd The date/time to end analyzing data, can use ${Property}. Full period.

Examples

See the automated tests.

The following example shows results using the above command editor values (adjusted on left, original on right):

AdjustExtremes Table

Results from AdjustExtremes Command

Troubleshooting

See Also