IRG

Wrapper function for one step IRG calculation. Only defaults.

irg(DT)

Arguments

DT	data.table of NDVI time series

Value

Extended data.table 'irg' column of instantaneous rate of green-up calculated for each day of the year, for each individual and year.

Details

data.table must have columns:

• 'id' - individual identifier

• 'yr' - year of observation

• 'NDVI' - NDVI value

• 'DayOfYear' - day of year/julian day of observation

• 'SummaryQA' - summary quality value for each sample (provided by MODIS)

See also

Other irg: calc_irg

Examples

# Load data.table
library(data.table)

# Read in example data
ndvi <- fread(system.file("extdata", "ndvi.csv", package = "irg"))

# Calculate IRG for each day of the year and individual
out <- irg(ndvi)
#> Warning: NAs found in DT, IRG will be set to NA.
#> Warning: no non-missing arguments to min; returning Inf
#> Warning: no non-missing arguments to max; returning -Inf
#> Warning: no non-missing arguments to min; returning Inf
#> Warning: no non-missing arguments to min; returning Inf
#> Warning: no non-missing arguments to max; returning -Inf
#> Warning: no non-missing arguments to min; returning Inf
#> Warning: no non-missing arguments to min; returning Inf
#> Warning: no non-missing arguments to max; returning -Inf
#> Warning: no non-missing arguments to min; returning Inf
#> Warning: no non-missing arguments to min; returning Inf
#> Warning: no non-missing arguments to max; returning -Inf
#> Warning: no non-missing arguments to min; returning Inf
#> Warning: no non-missing arguments to min; returning Inf
#> Warning: no non-missing arguments to max; returning -Inf
#> Warning: no non-missing arguments to min; returning Inf
#> Warning: no non-missing arguments to min; returning Inf
#> Warning: no non-missing arguments to max; returning -Inf
#> Warning: no non-missing arguments to min; returning Inf