gap.fill: Gap filling by linear interpolation

In TREXr: Tree Sap Flow Extractor

Description

Fills gaps by linear interpolation between observations. This function provides the option to define the minimum window under which gaps should be filled, using linear interpolation.

Usage

gap.fill(input, max.gap = 60, decimals = 10, df = FALSE)

Arguments

input	an is.trex-compliant object.
max.gap	Numeric value providing the maximum size of a gap in minutes, which can be filled by performing a linear interpolation.
decimals	Integer value defining the number of decimals of the output (default = 10).
df	Logical; if TRUE, output is provided in a data.frame format with a timestamp and a value (Δ T or Δ V) column. If FALSE, output is provided as a zoo object (default = FALSE).

Value

A zoo object or data.frame in the appropriate format for further processing.

Examples

# fill two hour gaps
raw   <- example.data(type = "doy")
input <-
  is.trex(
    raw,
    tz = "GMT",
    time.format = "%H:%M",
    solar.time = TRUE,
    long.deg = 7.7459,
    ref.add = FALSE,
    df = FALSE)

# create gaps in data
input[which(input < 0.4 | input > 0.82)] <- NA
fill_120 <- gap.fill(
  input = input,
  max.gap = 120,
  decimals = 10,
  df = FALSE)
fill_15 <- gap.fill(
  input = input,
  max.gap = 15,
  decimals = 10,
  df = FALSE)
  

TREXr documentation built on March 24, 2021, 5:06 p.m.