daily.data {dendRoAnalyst}

Calculation of daily statistics for dendrometer data

Description

This function calculates various statistics of dendrometer data on a daily basis. The daily statistics includes the daily maximum and minimum with their corresponding times and daily amplitude (difference between daily maximum and minimum). See King et al. (2013) for details.

Usage

daily.data(df, TreeNum)

Arguments

df

dataframe with first column containing date and time in the format yyyy-mm-dd HH:MM:SS and the dendrometer data in following columns.

TreeNum

numerical value indicating the tree to be analysed. E.g. '1' refers to the first dendrometer data column in df.

Value

A dataframe with the daily statistics of the dendrometer data that contains:

Columns		Description
DATE		The day of year in "yyyy-mm-dd".
Min		The minimum value record for the corresponding day.
Time_min		The time when minimum value recorded for the corresponding day.
Max		The maximum value record for the corresponding day.
Time_max		The time when maximum value recorded for the corresponding day.
mean		The daily average value of the dendrometer reading.
median		The daily median value of the dendrometer reading.
amplitude		The difference between daily maximum and daily minimum.
Remarks		"*" if Time_max > Time_min otherwise "".

References

King G, Fonti P, Nievergelt D, Büntgen U, Frank D (2013) Climatic drivers of hourly to yearly tree radius variations along a 6°C natural warming gradient. Agricultural and Forest Meteorology 168:36–46. doi:10.1016/j.agrformet.2012.08.002

Examples

library(dendRoAnalyst)
data(nepa17)
daily_stats<-daily.data(df=nepa17, TreeNum=1)
head(daily_stats,10)