retrieve: Retrieve field data from a netcdf file.

In metno/esd.test: Climate analysis and empirical-statistical downscaling (ESD) package for monthly and daily data.

Description

Retrieve data from a netcdf file and return a zoo field object with attributes. retrieve.

Usage

retrieve.default(ncfile,...)
retrieve.ncdf(ncfile = ncfile, path = path , param = "auto",
               lon = NULL, lat = NULL, lev = NULL, time = NULL,
               miss2na = TRUE, greenwich = TRUE , ncdf.check = TRUE,
               verbose = FALSE , plot = TRUE)
retrieve.ncdf4(ncfile = ncfile, path = path , param = "auto",
               lon = NULL, lat = NULL, lev = NULL, time = NULL,
               miss2na = TRUE, greenwich = TRUE , ncdf.check = TRUE,
               verbose = FALSE , plot = TRUE) 

summary.ncdf4(ncfile, verbose=FALSE)

check.ncdf4(ncid = ncid, param = "auto" , verbose = FALSE)
check.ncdf(ncid = ncid, param = "auto" , verbose = FALSE)

Arguments

ncfile	A character string of full path netcdf file name (include the path if necessary) or any object of class 'ncdf' or 'ncdf4'.
ncid	An object of class 'ncdf' or 'ncdf4'.
lon	Numeric value of longitude for the reference point (in decimal degrees East) or a vector containing the range of longitude values in the form of c(lon.min,lon.max)
lat	Numeric value of latitude for the reference point (in decimal degrees North) or a vector containing the range of latitude values in the form of c(lat.min,lat.max)
lev	Numeric value of pressure levels or a vector containing the range of pressure level values in the form of c(lev.min,lev.max)
time	Numerical year values or date values of time or a vector containing the range of values in the form of c(time.min,time.max). Date format should be in the form of "YYYY-MM-DD".
param	Parameter or element type. There are several core parameters or elements as well as a number of additional parameters. The parameters or elements are: auto = automatic selection. prcp, pr = Precipitation (mm) tas, tavg = 2m-surface temperature (in degrees Celcius) tmax, tasmax = Maximum temperature (in degrees Celcius) tmin, tasmin = Minimum temperature (in degrees Celcius)
plot	Logical value. if, TRUE provides a map.
greenwich	Logical value. If FALSE, convert longitudes to -180E/180E or centre maps on Greenwhich meridian (0 deg E).
ncdf.check	Logical value. If TRUE, performs a quick check of the ncfile contents
miss2na	Logical value. If TRUE missing values are converted to "NA"
verbose	Logical value defaulting to FALSE. If FALSE, do not display comments (silent mode). If TRUE, displays extra information on progress.

Value

A "zoo" "field" object with additional attributes used for further processing.

Author(s)

A. Mezghani

See Also

test.retrieve.ncdf4.

Examples

#\dontrun{
# Download air surface temperature (tas) for the 'NorESM1-ME' model
# output prepared for 'CMIP5 RCP4.5' and for run 'r1i1p1' from the climate
# explorer web portal (http://climexp.knmi.nl) and store the file into the temporary folder '/tmp' (Size ~96Mb)
download.file(url="http://climexp.knmi.nl/CMIP5/monthly/tas/tas_Amon_NorESM1-ME_rcp45_000.nc",
 destfile="/tmp/tas_Amon_NorESM1-ME_rcp45_000.nc", method = "auto", quiet = FALSE,mode = "w",cacheOK = TRUE)
# Retrieve the data into "gcm" object
gcm <-retrieve.ncdf4(ncfile="/tmp/tas_Amon_NorESM1-ME_rcp45_000.nc",param="tas",plot=TRUE)
# Download the air surface temperature (tas) for RCP 4.5 scenarios and
# NorESM1-ME model from the climate explorer and store it in destfile. 
# Compute the anomalies
gcm.a <- as.anomaly(gcm,ref=c(1960:2001))
map(gcm.a,projection="sphere")
#}

metno/esd.test documentation built on May 22, 2019, 7:49 p.m.