r2dRue (version 1.0.3)

rgf.create: Functions to read and write raster group files.

Description

Raster group files are essential elements for managing information on time-series in r2dRue. They are simply text lists containing the names of the files of a given time-series. Because names in such lists follow many times regular and sequential patterns, these functions may facilitate their creation.

Usage

rgf.read(inFl)
rgf.create(prefix,suffix='',ini,fin=ini,monthini=1,output)

Arguments

inFl

Filename of the raster group file to be read.

prefix

Prefix for the output filenames.

suffix

Suffix for the output filenames.

ini

Start year.

fin

End year.

monthini

Number-order of the start month (integer in the 1 to 12 range).

output

Filename to be written to disk.

Value

• Rgf.read returns a character vector with the filenames in the rgf file. Rgf.create returns a character vector. If an output file name parameter is specified, then the list is writen to disc.

Details

rgf.read reads a raster group file and returns a character vector with the read values. rgf.create is useful to generate sequences of file names that contain an indicator of the month and year. For example, take the sequence: Ndvi199001.tif, Ndvi199002.tif ... Ndvi199012.tif, Ndvi199101.tif, Ndvi199102.tif ... In it, a prefix ("Ndvi") is concatenated to a sequence of years (1990,1991) and months (01,02,...,12), and it ends with a suffix (".tif").

Examples

rgf.create('ndvi','.rst',1970,1975,output='ndvi.rgf')
ndvifiles=rgf.read('ndvi.rgf')