twd.maxima

This function detects the TWD phases, including their beginning (TWDb), using the phase.zg function. Then it calculates the number, time of occurance (Tm) and value of every local maximum within each TWD phase. In addition it calculates the time difference between 'TWDb' and each 'Tm' within each TWD phase.

There are various functions for managing and cleaning data before the application of different approaches. This includes identifying and erasing sudden jumps in dendrometer data not related to environmental change, identifying the time gaps of recordings, and changing the temporal resolution of data to different frequencies. Furthermore, the package calculates daily statistics of dendrometer data, including the daily amplitude of tree growth. Various approaches can be applied to separate radial growth from daily cyclic shrinkage and expansion due to uptake and loss of stem water. In addition, it identifies periods of consecutive days with user-defined climatic conditions in daily meteorological data, then check what trees are doing during that period.

Sugam Aryal

dendRoAnalyst

A Tool for Processing and Analyzing Dendrometer Data

Martin Häusser

Jussi Grießinger

Ze-Xin Fan

Achim Bräuning

twd.maxima function

<dl><dt>df</dt>
<dd>data frame with first column containing date and time in the format <code>yyyy-mm-dd HH:MM:SS</code>. It should contain data with constant temporal resolution for best results.</dd>
<dt>TreeNum</dt>
<dd>numerical value indicating the tree to be analysed. E.g. '1' refers to the first dendrometer data column in df.</dd>
<dt>smoothing</dt>
<dd>numerical value from 1 to 12 which indicates the length of the smoothing spline, i.e. 1 = 1 hour and 12 = 12 hours. Default is 5.</dd></dl>

Arguments

Locating the maxima of TWD periods — twd.maxima

<dl>

<dt>df</dt>
<dd>data frame with first column containing date and time in the format <code>yyyy-mm-dd HH:MM:SS</code>. It should contain data with constant temporal resolution for best results.</dd>


<dt>TreeNum</dt>
<dd>numerical value indicating the tree to be analysed. E.g. '1' refers to the first dendrometer data column in df.</dd>


<dt>smoothing</dt>
<dd>numerical value from 1 to 12 which indicates the length of the smoothing spline, i.e. 1 = 1 hour and 12 = 12 hours. Default is 5.</dd>

</dl>

twd.maxima: Locating the maxima of TWD periods

Description

Usage

Value

Arguments

Examples