COPYGB Tool (WRF PostProcessor)

COPYGB Functionality

The COPYGB tool was developed by the NOAA Environmental Modeling Center, is distributed by the National Weather Service, Climate Prediction Center, and is also distributed as part of the WRF PostProcessor (WPP). It may be run on GRIB files to horizontally interpolate the data from one grid to another. The MET tools which compare gridded forecasts to gridded observations (Grid-Stat, MODE, and Wavelet-Stat) require that the input forecast and observation data be on the same grid. Therefore the COPYGB tool is very useful in preparing your gridded data for use in MET.

COPYGB Usage

View the usage statement for COPYGB by simply typing the following:

/wrfhelp/MET/copygb.exe

Usage: copygb
	[-g "grid [kgds]"] [-i "ip [ipopts]"] [-k "kpds"] [-v "uparms"]
	[-B mapgrib [-b mapindex] [-A "<> mapthreshold"] [-K "mapkpds"]]
	[-M "mask"/mergegrib [-m mergeindex]] [-X] [-a] [-N namelist]
	then either: grid1 index1 grib2
	or: -x grib1 grib2

COPYGB accepts many optional command line options which control its functionality. In this tutorial, we'll focus on the simplest types of horizontal interpolation using the default interpolation options. For a full description of these command line options, please see the copygb.doc COPYGB documentation file.