readASD: Read ASD FieldSpec Pro binary and ASCII files

In prospectr: Miscellaneous Functions for Processing and Sample Selection of Spectroscopic Data

Read ASD FieldSpec Pro binary and ASCII files

Description

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.

Author(s)

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

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.

prospectr documentation built on Aug. 31, 2022, 5:05 p.m.