A simple driver that reads binary data created by the ASD Inc. portable spectrometer instruments, such as the FieldSpec (for more information, see < http://www.asdi.com/products/fieldspec-spectroradiometers>). Spectral data can be extracted from the ASD files as raw (DN), white reference, radiance, or reflectance. Additionally, the metadata information contained in the ASD file header can also be accessed.
Reading ASD Binary Files in R
This package implements a simple reader for spectroscopy data collected using ASD (now PAN Analytics, Inc.) visible near-infrared spectrometers, and stored using the ASD format (which is documented here).
The spectra can be extracted from the ASD file as raw (DN), white reference, radiance, or reflectance. Additionally, the metadata information contained in the ASD file header can also be accessed.
It's easiest to use the
devtools package to install
I haven't come around to submit this on CRAN yet.
The main function is
get_spectra. It takes one (or more) paths to
*.asd files and returns a matrix of spectra. The other potentially useful function is
get_metadata, which returns the contents of the header of a a given
*.asd file is included for testing/examples purposes. The path to this sample file can be access using the shorthand function
fn <- asd_file()s <- get_spectra(fn)plot(as.numeric(s), type = 'l')
or, for the pipe afficionados:
library(magrittr)asd_file() %>%get_spectra %>%as.numeric %>%plot(type = 'l')
This package has been developed working on
*.asd files in version 8 (that's my setup), along with some of the documentation that can be found online. In particular, reading code from @serbinsh (here) and @antoinestevens (here) proved to be helpful.
I'm sure this thing could probably become better with help from people with different setups/file format versions --- contributions welcome!