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Display lows below value & Display peaks above value
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Shows all peak heights or dip depths and duration above or below a reference level. This level is set by default but can be altered in the toolbar. After adjusting, press the apply button to recalculate the peaks or dips. . From now on we will only mention the peaks and how values are above a level, but this functionality is symmetrical for the valleys and values being below a level. The default value for the reference level is set by determining the 'low' areas according to the maximum available value of the input time series array.
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<statisticalFunction function="showLowsBelow"/> <statisticalFunction function="showPeaksAbove"/> |
Display lows below value & Display peaks above value (per year and season)
(Since 2016.02) The same as the function above but then with the extension of selecting multiple different years and seasons, plus a choice of how the different seasons and years should be uniquely colored.
Unique color per season
Unique color per year:
Unique color per year and season:
Normalize duration
(Since 2016.02) for the peaks above/below functions a checkbox is added to normalize over duration. This changes The y-axis from Normalized difference to Max difference and the X-axis from (total) duration the Normalized duration.
The differences between normalization can best be shown in a pictures
Normalized difference:
Normalized duration:
Split peaks
(Since 2016.02) for the peaks above/below functions a possibility is added to split the peaks when they have multiple local maxima.
No split:
Split when local maxima have a low between them with a value difference of at least 0,001. As can be seen this results in a lot more separate peaks.
For the value difference the measure Prominence is used, which is an official measure for determining separate peaks.
Source: https://en.wikipedia.org/wiki/Topographic_prominence
Double Mass curve
Isused in the study of the consistency and long-term trend test of hydrometeo--rological data. This method was first used to analyze the consistency of precipitation data in Susquehanna watershed United States by Merriam at 1937 (Merriam, 1937), and Searcy made a theoretical explanation
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