Consecutive dry days index per time period

Let infile be a time series of the daily precipitation amount RR, then the largest number of consecutive days where RR is less than R is counted. R is an optional parameter with default R = 1 mm. A further output variable is the number of dry periods of more than N days. Parameter is a comma-separated list of "key=values" pairs.

Usage

cdo_eca_cdd(ifile, R = NULL, N = NULL, freq = NULL, ofile = NULL)

cdo_etccdi_cdd(ifile, R = NULL, N = NULL, freq = NULL, ofile = NULL)

Arguments

ifile

String with the path to the input file.

R

FLOAT - Precipitation threshold (unit: mm; default: R = 1 mm)

N

INTEGER - Minimum number of days exceeded (default: N = 5)

freq

STRING - Output frequency (year, month)

ofile

String with the path to the output file.

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.

Details

eca_cdd     Consecutive dry days index per time period
            The operator counts over the entire time series.
            The date information of a timestep in outfile is the date of
            the last contributing timestep in infile.
etccdi_cdd  Consecutive dry days index per time period
            The default output frequency is yearly.
            Periods within overlapping years are accounted for the first year.
            The date information of a timestep in outfile is the mid of
            the frequency interval.