Extract RGB metrics — extract_rgbValues • managecrownsdata

The function extracts RGB metrics (red, green, blue, sumrgb, rcc, gcc, bcc, gndvi, gli) for each crown at each date. It first compute the metrics for the whole mosaics and then extracts the value at the crown scale using the exactextractr::exact_extract function. The mean and / or the variance can be extracted (see 'fun' parameter).

Usage

extract_rgbValues(
  path_in,
  path_crowns,
  out_dir_path,
  ncor = 1,
  sites = NULL,
  dates = NULL
)

Arguments

path_crowns: chr. Path to the crown file
out_dir_path: chr. The path to the directory use to stored the result.
ncor: num. Number of cores
sites: chr. name of the site, p.e 'Mbalmayo'.
dates: chr. vector of dates (format should be 'yyyy_mm_dd', p.e '2022_09_25'). The order of the dates should match with the order of the path_images !
path_images: a list with the full paths to the RGB rasters.