Process meteorological and atmospheric data — process

The process_merra2() function imports and cleans raw atmospheric composition data, returning a single SpatRaster object.

Usage

process_merra2(
  date = c("2018-01-01", "2018-01-10"),
  variable = NULL,
  path = NULL,
  extent = NULL,
  ...
)

Arguments

date: character(1 or 2). Date (1) or start and end dates (2). Format YYYY-MM-DD (ex. September 1, 2023 = "2023-09-01").
variable: character(1). MERRA2 variable name(s).
path: character(1). Directory with downloaded netCDF (.nc4) files.
extent: numeric(4) or SpatExtent giving the extent of the raster if NULL (default), the entire raster is loaded
...: Placeholders.

Value

a SpatRaster object;

Note

Layer names of the returned SpatRaster object contain the variable, pressure level, date, and hour. Pressure level values utilized for layer names are taken directly from raw data and are not edited to retain pressure level information.

Author

Mitchell Manware

Examples

## NOTE: Example is wrapped in `\dontrun{}` as function requires a large
##       amount of data which is not included in the package.
if (FALSE) { # \dontrun{
merra2 <- process_merra2(
  date = c("2024-01-01", "2024-01-10"),
  variable = "CPT",
  path = "./data/inst1_2d_int_Nx"
)
} # }