USGS: import USGS spectra

In hsdar: Manage, Analyse and Simulate Hyperspectral Data

import USGS spectra

Description

Import and download spectral data from USGS spectral library

Usage

USGS_get_available_files(url = NULL)

USGS_retrieve_files(avl = USGS_get_available_files(), 
                    pattern = NULL, retrieve = TRUE, 
                    loadAsSpeclib = TRUE, tol = 0.1)

Arguments

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 USGS_get_available_files.
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.

Author(s)

Lukas Lehnert

Examples

## 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)

hsdar documentation built on March 18, 2022, 6:35 p.m.