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


install the released version from CRAN:

# install.packages() # does not work currently

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

install the dev-version from GitHub:

if (!require("devtools")) install.packages("devtools")
# devtools::install_github("kang-yu/visa") # install without vignettes
devtools::install_github("kang-yu/visa", build_opts = c("--no-resave-data", "--no-manual"))

You might encounter this problem of install_github(), and in this case, you could try update the {remotes} devtools::install_github("r-lib/remotes").


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)

Bug report contributions welcome

You can report your issues of using visa here. Don’t know how to report a bug? Check RStudio’s Instructions on Writing Good Bug Reports.

You might find useful information by checking the issues reported by others.