extractDate: Extract dates from (MODIS) files

In aubreyd/modis4rwrfhydro: MODIS acquisition and processing

Description

This function helps to extract dates in a vector of files

Usage

extractDate(files,pos1=10,pos2=16,asDate=FALSE,format='%Y%j')

Arguments

files	vector of filenames where from extract the dates. Can include also the filepath!
pos1	Start position of date in the filename. You have to count, sorry!
pos2	End position of date in the filename. You have to count, sorry!
asDate	Logical, default is FALSE. If TRUE the result is converted to a Date object
format	Used only if asDate=TRUE, MODIS dates are normally formatted as "%Y%j" (Year and julian day) See: as.Date for modifications.

Value

Vector with character, if asDate=FALSE or vector of "Date"'s if TRUE, extracted from filenames

Author(s)

Matteo Mattiuzzi

Examples

## Not run: 
# example on HDF files
files <- c("MOD13Q1.A2010209.h18v03.005.2010239071130.hdf",
"MOD13Q1.A2010225.h18v03.005.2010254043849.hdf")
extractDate(files)
extractDate(files,asDate=TRUE)

# on any other file 
files <- c("Myfile_20010101.XXX","Myfile_20010115.XXX","Myfile_20010204.XXX")
extractDate(files,pos1=8,pos2=15)
extractDate(files,pos1=8,pos2=15,asDate=TRUE,format="%Y%m%d")

## End(Not run)

aubreyd/modis4rwrfhydro documentation built on May 10, 2019, 2:13 p.m.