Plot spectra as discrete points at Sentinel band positions

Like plotspectra, but plots each spectrum as discrete points with the x-axis labeled by band name (e.g. Sentinel-2 band names) instead of a continuous wavelength line — for cases where the input columns are individual sensor bands rather than a continuous spectrum.

Usage

plotspectra_SE(
  df,
  x = 1,
  y = 2,
  cols = y,
  xlim = range(df[, x], na.rm = T),
  ylim = range(df[, y], na.rm = T),
  main = "",
  xlab = "",
  ylab = "",
  ...
)

Arguments

df

data.frame. Table with one column per sensor band plus a values column, following the layout produced by plotspectra_image.

x

integer or character. Column index or name in df whose column names are used as x-axis band labels. Default 1.

y

integer or character vector. Column index(es) or name(s) in df to plot as points on the y-axis. Default 2.

cols

vector. Point colors, one per element of y. Defaults to y itself.

xlim

numeric vector of length 2. X-axis plot limits. Defaults to the data range of column x.

ylim

numeric vector of length 2. Y-axis plot limits. Defaults to the data range of columns y.

main

character. Plot title.

xlab

character. X-axis label.

ylab

character. Y-axis label.

...

additional graphical parameters passed to the underlying points() call.

Value

a plot