readZAMGGRIB: Read a GRIB-1 file using wgrib

In freysimon/ZAMGR: Collection of functions for reading and writing ZAMG raster products

Read a GRIB-1 file using wgrib

Description

Read a GRIB-1 file provided by the ZAMG using wgrib and extract a specific raster set.

Usage

readZAMGGRIB(
  gribfile,
  ex = NULL,
  crs = NULL,
  wgrib = NULL,
  recnr = NULL,
  variable = NULL,
  remove = FALSE
)

Arguments

gribfile	Absolute path to a gribfile
ex	Either an extent object, NULL, 'alaro', 'arome', or 'ecmwf'.
crs	Either a crs string, NULL, 'alaro', 'arome', or 'ecmwf'.
wgrib	Absolute path to the executable of wgrib. If NULL, wgrib must be installed properly on the system.
recnr	numeric giving the record number of the respective variable within GRIB file
variable	character string giving the abbreviated variable within the GRIB file.
remove	either TRUE/FALSE for removing / not removing the gribfile after reading or ”success'/fail' for only removing files that have / haven't been successfully read.

Details

If ex and/or crs are supplied, the returned raster will be projected. If ex and/or crs are specified as "alaro", "arome", or "ecmwf" the respective extent and crs are used.

Either recnr or variable must be specified to extract the information of interest. If both are given the latter is ignored.

This function relies on the package TigR, which is available on Github

Note that wgrib (64Bit) must be installed on the machine. It can be downloaded from http://www.cpc.ncep.noaa.gov/products/wesley/wgrib.html

ZAMG per default flips their rasters by "y", so the output will be flipped back that the raster is projected correctly.

Value

A (projected) raster with the extracted information

Author(s)

Simon Frey

See Also

For reading INCA files, see readINCABIL

freysimon/ZAMGR documentation built on Nov. 3, 2023, 9:44 p.m.