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Description

This selection ensemble member by index transformation takes two inputs. One is a grid time series with different ensemble members. The other one is a scalar time series. The values of the scalar time series should be ensemble indices.  The transformation uses the time of the indeces for the output, and places the grid with the corresponding ensemble index into that time step.

The transformation has one optional parameter, matchInputAndOutputGridTimes.  Because the time of the output time series is determined by the time of the ensemble member indices, it can happen that the input grids do not have data at the given time. If matchInputAndOutputGridTimes is set to false, and the exact time step is unavailable, the first available grid data of the given ensemble member will be filled in the output. If it is set to true, output will only be filled if the data is available for the exact time.  Default value for matchInputAndOutputGridTimes is false.

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Some notes as to behaviour:

  • Missing values in the index time series result in missing values in the output time series.
  • Index values for which no matching ensemble member is found result in missing values in the output time series

    <transformation id="ensembleLookup">
          <selection>
             <gridEnsembleMemberByIndex>
                <inputEnsembleIndices>
                   <variableId>InputIndex</variableId>
                </inputEnsembleIndices>
                <inputTimeSeriesGrids>
                   <variableId>InputGrids</variableId>
                </inputTimeSeriesGrids>
                <output>
                   <variableId>Output</variableId>
                </output>
                <matchInputAndOutputGridTimes>false</matchInputAndOutputGridTimes>
             </gridEnsembleMemberByIndex>
          </selection>
       </transformation>
    </transformationModule>
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