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A low tide value is valid if:
- There is a value are at least two timestamps within the search window both , one before and one after the extreme, where the absolute difference between the peak extreme and the value is greater than the validDifferenceExceedence. The value before the peak extreme is called firstThresholdValue firstThresholdCrossing in this method, the value after the peak is called the secondThreshold valuesecondThresholdCrossing.
- Missing values are not allowed between the peak extreme and the two threshold valuescrossings.
If a missing value is found after the minimum and before the second threshold, the peak is automatically invalid.
The transformation produces two non-equidistant output series with timestamps of the low tide extremes: one serie series holds the water level, the orther series holds the associated tide number.
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