import USGS spectra
Import and download spectral data from USGS spectral library
USGS_get_available_files(url = NULL)
USGS_retrieve_files(avl = USGS_get_available_files(),
pattern = NULL, retrieve = TRUE,
loadAsSpeclib = TRUE, tol = 0.1)url |
Character passing the url of the data. If NULL, the following URL is used: 'ftp://ftpext.cr.usgs.gov/pub/cr/co/denver/speclab/pub/spectral.library/splib06.library/ASCII/' |
avl |
List of available files. Typically the result of |
pattern |
Search pattern to define a subset of all available spectra. |
retrieve |
Logical. Should the data be downloaded? |
loadAsSpeclib |
Logical. If TRUE, an object of class "Speclib" is retured |
tol |
Discrepancy of the wavelength values between different spectra. |
Lukas Lehnert
## Not run: ## Retrieve all available spectra avl <- USGS_get_available_files() ## Download all spectra matching "grass-fescue" grass_spectra <- USGS_retrieve_files(avl = avl, pattern = "grass-fescue") plot(grass_spectra) ## End(Not run)
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