PCP-Combine Tool: General

PCP-Combine Functionality

The PCP-Combine tool is used (if needed) to add, subtract, or sum accumulated precipitation from several GRIB files into a single NetCDF file containing the desired accumulation period. It's NetCDF output may be used as input to the Point-Stat, Grid-Stat, Wavelet-Stat, Ensemble-Stat, and MODE tools. PCP-Combine may be used to sum any GRIB code you like by using the -gc command line option. The GRIB files being combined must have already been placed on a common grid on which the user would like to verify. The copygb utility is recommended for re-gridding GRIB files. In addition, the PCP-Combine tool will only sum model files with the same initialization time unless it is indicated to ignore the initialization time.

PCP-Combine Usage

View the usage statement for PCP-Combine by simply typing the following:

bin/pcp_combine

Usage: pcp_combine
	[[-sum] sum_args] | [-add add_args] | [-subtract subtract_args] (Note: "|" means "or")
	[[-sum] sum_args]	Accumulations from multiple files should be summed up using the arguments provided.
	[-add add_args]	Accumulations from two files should be added together using the arguments provided.
	[-subtract subtract_args]	Accumulations from two files should be subtracted using the arguments provided.
	[-gc code]	Overrides the default GRIB code (61) to be used (optional).
	[-ptv number]	Overrides the default GRIB parameter table version number (2) to be used (optional).
	[-log file]	Outputs log messages to the specified file
	[-v level]	Level of logging

Use the -sum, -add, or -subtract command line option to indicate the operation to be performed. Each operation has its own set of required arguments.