Performs minimum time step standardization,
gap filling and start/end time selection. This function
provides the option to select the minimum temporal step size of an
is.trex object. Additionally, the user can define the
start and end time of the series and select the minimum size under
which gaps should be filled, using linear interpolation.
Time series have different temporal resolutions. This function provides the option to standardize the minimum time step by either performing a linear interpolation when the requested time step is smaller than the minimum time step of the series or average values when the requested time step is larger than the minimum time step of the series. Before this process, the entire time series is converted to a one-minute time step by applying a linear interpolation (excluding gap \(periods > \code{max.gap}\)).
dt.steps(input, start,
end, time.int = 10, max.gap = 60,
decimals = 10, df = FALSE)An is.trex-compliant (output) object
Character string providing the start time for the series. Format has to be provided in "UTC" (e.g., "2012-05-28 00:00" or Year-Month-Day Hour:Minute). Starting time should not be earlier than the start of the series.
Character string providing the start time for the series. Format has to be provided in "UTC" (e.g., "2012-06-28 00:50" or Year-Month-Day Hour:Minute). End time should be earlier than the end time and not later than that of the series.
Numeric value providing the number of minutes for the
minimum time step. When time.int is smaller than the minimum time step
of the series, a linear interpolation is applied. If time.int is
larger than the minimum time step of the series values are averaged to the chosen
value of time.int (after performing a linear interpolation
to obtain a one-minute resolution).
Numeric value providing the maximum size of a gap in minutes, which can be filled by performing a linear interpolation.
Integer value defining the number of decimals of the output (default = 10).
Logical; if TRUE, output is provided in a data.frame
format with a timestamp and a value (\(\Delta T\) or \(\Delta V\)) column.
If FALSE, output is provided as a zoo object (default = FALSE).
A zoo object or data.frame in the appropriate
format for further processing.
if (FALSE) {
input <- is.trex(example.data(type="doy"),
tz="GMT",time.format="%H:%M", solar.time=TRUE,
long.deg=7.7459,ref.add=FALSE)
in.ts <- dt.steps(input=input,start='2012-06-28 00:00',end='2012-07-28 00:00',
time.int=60,max.gap=120,decimals=6,df=FALSE)
plot(in.ts)
head(in.ts)
}