oce (version 0.9-17)

oce.colors: Create a palette of colours

Description

Create a palette of colours

Usage

oce.colorsPalette(n, which=1)
oce.colorsGebco(n=9, region=c("water", "land", "both"),
	type=c("fill","line"))
oce.colorsJet(n)
oce.colors9A(n)
oce.colors9B(n)
oce.colorsTwo(n, low=2/3, high=0, smax=1, alpha = 1)

Arguments

n

the number of colors ($\ge 1$) to be in the palette.

which

an identifier for the palette (see Details).

region

the region characteristic, for oce.colorsGebco.

type

the type of item drawn, for oce.colorsGebco.

low

the hue, in [0,1], for the low end of a oce.colorsTwo scale.

high

the hue, in [0,1], for the high end of a oce.colorsTwo scale.

smax

the maximum saturation, in [0,1], for the colors of oce.colorsTwo.

alpha

the alpha value, in [0,1], for the colors of oce.colorsTwo.

Details

oce.colorsPalette provides a variety of pre-defined palettes. which=1 yields the ColorBrewer diverging red/blue scheme while which=2 yields the ColorBrewer diverging RYB scheme. (Each is interpolated from the 11-class schemes provided on this site.)

A family of nine-color schemes is as follows: which="jet" (or which="9A" or which=9.01 for the Jet scheme; which="9B" or which=9.02 for a scheme similar to Jet but omitting the green, and somewhat desaturating the yellow and cyane.

oce.colorsGebco provides palettes that mimic the GEBCO altas colours, with shades of blue for water and of brown for land. The blue values go from dark to light, and the brown ones from light to dark; in this way, topographic images have light values near sea-level, and get darker in either deeper water or higher terrain.

oce.colorsJet provides a palette similar to the Matlab jet palette.

oce.colorsTwo provides a two-tone palette that fades to white at central values.

References

Color Brewer. http://colorbrewer2.org/

Light, A., and P. J. Bartlein, 2004. The End of the Rainbow? Color Schemes for Improved Data Graphics. Eos Trans. AGU, 85(40), doi:10.1029/2004EO400002.

Martin Jakobsson, Ron Macnab, and Members of the Editorial Board, IBCAO. Selective comparisons of GEBCO (1979) and IBCAO (2000) maps. http://www.ngdc.noaa.gov/mgg/bathymetry/arctic/ibcao_gebco_comp.html

Stephenson, David B., 2005. Comment on ``Color schemes for improved data graphics,'' by A. Light and P. J. Bartlein. Eos Trans. AGU, 86(20). (See also http://geography.uoregon.edu/datagraphics/color_scales.htm)

Examples

library(oce)
opar <- par(no.readonly = TRUE)
x <- array(1:1000, dim=c(1,1000))
par(mfrow=c(1,4))
image(x, col=oce.colorsTwo(200), main="oce.colorsTwo")
image(x, col=oce.colorsJet(200), main="oce.colorsJet")
image(x, col=oce.colorsGebco(200), main="oce.colorsGebco")
image(x, col=oce.colorsPalette(200), main="oce.colorsPalette")
par(opar)

# real-world example, with acoustic-doppler profiler data
data(adp)
par(mfrow=c(3,1))
plot(adp, which='u1')
plot(adp, which='u1', col=oce.colorsJet)
plot(adp, which='u1', col=oce.colors9B)