RStoolbox: writeSLI – R documentation

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writeSLI

Write ENVI spectral libraries

Description

Writes binary ENVI spectral library files (sli) with accompanying header (.sli.hdr) files OR ASCII spectral library files in ENVI format.

Usage

writeSLI(x, path, wavl.units = "Micrometers", scaleF = 1,
  mode = "bin", endian = .Platform$endian)

Arguments

`x`	data.frame with first column containing wavelengths and all other columns containing spectra.
`path`	path to spectral library file to be created.
`wavl.units`	wavelength units. Defaults to Micrometers. Nanometers is another typical option.
`scaleF`	optional reflectance scaling factor. Defaults to 1.
`mode`	character string specifying output file type. Must be one of `"bin"` for binary .sli files or `"ASCII"` for ASCII ENVI plot files.
`endian`	character. Optional. By default the endian is determined based on the platform, but can be forced manually by setting it to either "little" or "big".

Details

ENVI spectral libraries with ending .sli are binary arrays with spectra saved in rows.

Examples

## Example data
sliFile <- system.file("external/vegSpec.sli", package="RStoolbox")
sliTmpFile <- paste0(tempdir(),"/vegetationSpectra.sli") 

## Read spectral library
sli <- readSLI(sliFile)
head(sli)
plot(sli[,1:2], col = "orange", type = "l")
lines(sli[,c(1,3)], col = "green")
 
## Write to binary spectral library
writeSLI(sli, path = sliTmpFile)

RStoolbox

Tools for Remote Sensing Data Analysis

v0.2.6

GPL (>= 3)

Authors

Benjamin Leutner [cre, aut], Ned Horning [aut], Jakob Schwalb-Willmann [aut], Robert J. Hijmans [ctb]

Initial release