selmulti: Select multiple fields via GRIB1 parameters

In rcdo: Wrapper of 'CDO' Operators

Select multiple fields via GRIB1 parameters

Description

This module selects multiple fields from infile and writes them to outfile. selection-specification is a filename or in-place string with the selection specification. Each selection-specification has the following compact notation format: <type>(parameters; leveltype(s); levels) type " " sel for select or del for delete (optional) parameters" " GRIB1 parameter code number leveltype " " GRIB1 level type levels " " value of each level Examples: (1; 103; 0) (33,34; 105; 10) (11,17; 105; 2) (71,73,74,75,61,62,65,117,67,122,121,11,131,66,84,111,112; 105; 0) The following descriptive notation can also be used for selection specification from a file: SELECT/DELETE, PARAMETER=parameters, LEVTYPE=leveltye(s), LEVEL=levels Examples: SELECT, PARAMETER=1, LEVTYPE=103, LEVEL=0 SELECT, PARAMETER=33/34, LEVTYPE=105, LEVEL=10 SELECT, PARAMETER=11/17, LEVTYPE=105, LEVEL=2 SELECT, PARAMETER=71/73/74/75/61/62/65/117/67/122, LEVTYPE=105, LEVEL=0 DELETE, PARAMETER=128, LEVTYPE=109, LEVEL=* The following will convert Pressure from Pa into hPa; Temp from Kelvin to Celsius: SELECT, PARAMETER=1, LEVTYPE= 103, LEVEL=0, SCALE=0.01 SELECT, PARAMETER=11, LEVTYPE=105, LEVEL=2, OFFSET=273.15 If SCALE and/or OFFSET are defined, then the data values are scaled as SCALE*(VALUE-OFFSET).

Usage

cdo_changemulti(ifile, ofile = NULL)

cdo_delmulti(ifile, ofile = NULL)

cdo_selmulti(ifile, ofile = NULL)

Arguments

ifile	String with the path to the input file.
ofile	String with the path to the output file.

Details

selmulti     Select multiple fields
delmulti     Delete multiple fields
changemulti  Change identication of multiple fields

Value

Operators that output one or more files return a character vector to the output files.

Operators that output an indefinite number of files return a string with the basename of the files.

Operatos that don't return filenames return a character vector with the string output.

rcdo documentation built on June 8, 2025, 12:36 p.m.