Plot or add points using a color scale

Custon plot for SpatRaster (terra R-package) object based on terra package

Usage

overlay(
  p,
  z,
  col,
  lim = range(z, na.rm = TRUE),
  symmetry = TRUE,
  pch = 19,
  cex = 1,
  outside = TRUE,
  add = TRUE,
  plg = list(tic = "none", shrink = 1),
  pax = list(),
  expand = 1.15,
  ...
)

Arguments

p: SpatVector points
z: column name or a vector of values to plot
col: color
lim: range of values for scale
symmetry: calculate symmetrical scale
pch: type of point
cex: character expansion for the points
outside: to include values outside range
add: add to existing plot
plg: list of parameters passed to terra::add_legend
pax: list of parameters passed to graphics::axis
expand: to expand the plot region
...: arguments to be passing to terra::plot

Examples

sp<- terra::vect(paste0(system.file("extdata",package="eva3dm"),"/masp.shp"))
BR<- terra::vect(paste0(system.file("extdata",package="eva3dm"),"/BR.shp"))

p    <- readRDS(paste0(system.file("extdata",package="eva3dm"),"/sites_AQ_BR.Rds"))
p$id      <- row.names(p)
point     <- terra::vect(p)
point$NMB <- 1:45 - 20 # some values to plot

terra::plot(BR, main = 'add points',xlim = c(-52,-37),ylim = c(-25,-18))
terra::lines(BR)
terra::lines(sp, col = 'gray')
overlay(point,point$NMB,cex = 1.4)


overlay(point,point$NMB,cex = 1.4, add = FALSE, main = 'new plot')
terra::lines(BR)
terra::lines(sp, col = 'gray')