Vegetation Imaging Spectroscopy Analyzer

Provides easy-to-use tools for data analysis and visualization for hyperspectral remote sensing (also known as imaging spectroscopy), with a particular focus on vegetation hyperspectral data analysis. It consists of a set of functions, ranging from the organization of hyperspectral data in the proper data structure for spectral feature selection, calculation of vegetation index, multivariate analysis, as well as to the visualization of spectra and results of analysis in the 'ggplot2' style.

visa

This R package is to facilitate Vegetation Imaging Spectroscopy Analysis (VISA). For more details of this package, you can browseVignettes("visa").

Installation

install the released version from CRAN:

The very first version of visa (0.1.0) is on CRAN.

install.packages("visa")

You might encounter problem of package dependencies, such as some functions depend on ggplot2, ggpmisc. In such cases, you would have to install all the dependencies.

install the dev-version from GitHub:

The current version on GitHub is v1.0.0.

if (!require("devtools")) install.packages("devtools")
devtools::install_github("kang-yu/visa")

The v1.0.0 requires support for interactive plotting. Installation on Max OS may cause error X11 library is missing.

Usage

library(visa)
data(NSpec.DF)
x <- NSpec.DF$N # nitrogen
S <- NSpec.DF$spectra[, seq(1, ncol(NSpec.DF$spectra), 10)] # resampled to 10 nm steps
cm.nsr(S, x, cm.plot = TRUE)