cdfextract {clim.pact}R Documentation

Extract a subfield from a netCDF file.

Description

A slow routine that extraxcts a subfield. This routine is suitable for reading subsections of large data files that are too big for retrieve.nc.

Usage

cdfextract(filename,varname,x.rng=NULL,y.rng=NULL,t.rng=NULL,
                  greenwich=TRUE,x.nam="lon",y.nam="lat",t.nam="tim",
                       plot=FALSE,l.scale=TRUE)

Arguments

filename name of netCDF file.
varname name ov variable.
x.rng X-range (in degrees East): c(min,max).
y.rng Y-range (in degrees North): c(min,max).
t.rng T-range (in units stored in 'tim'): c(min,max).
greenwich TRUE: longitude runs from -180E to 180E.
x.nam name of X-dimension.
y.nam name of Y-dimension.
t.nam name of T-dimension.
plot TRUE for plotting.
l.scale scale field by offset and scaling-factor.

Value

a field object. Also see retrieve.nc. Saves the extracted data in a netCDF file called "cdfextract.nc" under current working directory (see r2cdf).

Author(s)

R.E. Benestad

Examples


slp <- cdfextract("data/nmc_slp.nc","slp",x.rng=c(-80,40),y.rng=c(20,75),
                  t.rng=c(times[is],times[is]+499),plot=FALSE)
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