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Read ASD FieldSpec Pro binary and ASCII files

Source: R/readASD.R
readASD.Rd

Maturing lifecycle

Read single or multiple binary and ASCII files acquired with an ASD FieldSpec Pro (ASDi, Boulder, CO) spectroradiometer

Usage

readASD(fnames, in_format, out_format)

Arguments

fnames

a character vector of the name(s) (with absolute path) of the file(s) to read.

in_format

the format of the input file: 'binary' or 'txt'.

out_format

the format of the output: 'matrix' (default) or 'list' (see below).

Value

if out_format = 'matrix', reflectance values of the input file(s) in a single matrix.

if out_format = 'list', a list of the input file(s) data consisting of a list with components:

  • Name: name of the file imported

  • datetime: date and time of acquisition in POSIXct format

  • header: list with information from the header file

  • radiance: if applicable, a numeric vector of radiance values

  • reference: if applicable, a numeric vector of radiance values of the white reference

  • reflectance: numeric vector of reflectance values

  • wavelength: numeric vector of the band positions

Note

There is a R port of the importasd.m function from the ‘FSFPostProcessing’ Matlab toolbox by Iain Robinson (University of Edinburgh), which is based on some Java code provided by Andreas Hunei (University of Zurich).

It seems that ASD file format has changed quite a lot with file versions. The function will possibly not work as expected for all versions. Please report any bugs to the package maintainer.

References

Robinson, I., and A. MacArthur. 2011. The Field Spectroscopy Facility Post Processing Toolbox User Guide. Post processing spectral data in MATLAB, University of Edinburgh, Edinburgh, UK.

Author

Antoine Stevens (R port), Iain Robinson (matlab function) & Leonardo Ramirez-Lopez (R port)