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Configuration guide for an IDMA display
An IDMA display shows the difference between accumulated values of an observed time series and average accumulation of a number of time series from a base group of locations. If the observed time series has missing values, values from an estimated time series can be used.
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Example 4 shows an IDMA display. The blue, green, and red lines each correspond to accumulation differences for three different time series from three different locations, namely: ALCOVE DAM, ALBANT INTL AP, and ALBANY NVVFO UNIV DORSET 2 SET, PERU, and DALTON. The blue line is thicker than the rest because it corresponds to the location (ALCOVE DAMDORSET 2 SET) which is selected in the location drop down. The white dots gray lines show calculations with estimated values, wherever observation values were not available.
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Example 4: an IDMA display
Applying modifiers
As the display in Example 4 shows, the slope of the accumulated differences changes at different places. Therefore it is possible to apply a modifier wherever a slope change is observed to make corrections. To apply a modifier, a start time, end time, and a correction factor need to be specified. On the IDMA plot, two yellow orange markers correspond to the specified start and end times. Once a modifier is applied, it is possible to choose to see the raw values to be able to compare them with the modified values. The raw values will be shown with the same color, but different line style and line width, to indicate the differencepossible differences.
Example 5 shows the display after a modifier was applied. In this case, the specified factor is 2. The dashed blue line shows the raw estimates before the modifier was applied.
Example 5: an IDMA display,
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before a modifier is applied
