marmap (version 0.9.4)

etopo: Etopo colours

Description

Various ways to access the colours or on the etopo colour scale

Usage

etopo.colors(n)
scale_fill_etopo(...)
scale_colour_etopo(...)

Arguments

n

number of colours to get from the scale. Those are evenly spaced within the scale.

...

passed to scale_fill_gradientn or scale_colour_gradientn

Details

etopo.colors is equivalent to all usual colours in R (heat.colors, cm.colors).

scale_fill/contour_etopo are meant to be used with ggplot2. They allow consistent plots in various subregions by setting the limits of the scale explicitly.

See Also

autoplot.bathy, palette.bathy

Examples

# load NW Atlantic data and convert to class bathy
	data(nw.atlantic)
	atl <- as.bathy(nw.atlantic)

  library("ggplot2")
  head(fortify(atl))

  # one can now use bathy objects with ggplot directly
  ggplot(atl) + geom_contour(aes(x=x, y=y, z=z))
  
  # which allows complete plot configuration
  atl.df <- fortify(atl)
  ggplot(atl.df, aes(x=x, y=y)) +
    geom_raster(aes(fill=z), data=atl.df[atl.df$z <= 0,]) +
    geom_contour(aes(z=z),
      breaks=c(-100, -200, -500, -1000, -2000, -4000),
      colour="white", size=0.1
    )