R: Create colors suitable for density fields

oceColorsDensity {oce} | R Documentation

## Create colors suitable for density fields

### Description

Create a set of colors for displaying density values, based on the scheme devised by Thyng et al. (2016) and presented in a python package by Thyng (2019). The color specifications were transliterated from python to R on 2015-09-29, but have not been adjusted since, even though the python source has changed. This is to prevent breaking old `oce` code. To get the latest versions of these colours or other colours, use the cmocean R package (Thyng, Richards, and Krylov, 2019) directly, as is illustrated (with the "matter" scheme) in Example 2. Note that the cmocean core functions provide a way to select between various versions of the colour schemes. It is also worth considering the palettes provided by the viridis package, as illustrated (with the "inferno" scheme) in Example 3.

### Usage

    oceColorsDensity(n)

### Arguments

`n` | number of colors to create.

### Value

A vector of color specifications.

### Author(s)

Krysten M. Thyng (Python version), Dan Kelley (R transliteration)

### References

- Thyng, Kristen, Chad Greene, Robert Hetland, Heather Zimmerle, and Steven DiMarco. “True Colors of Oceanography: Guidelines for Effective and Accurate Colormap Selection.” Oceanography 29, no. 3 (September 1, 2016): 9–13. doi: 10.5670/oceanog.2016.66

- Thyng, Kristen. Kthyng/Cmocean. Python, 2019. https://github.com/kthyng/cmocean.

- Thyng, Kristen, Clark Richards, and Ivan Krylov. Cmocean: Beautiful Colour Maps for Oceanography (version 0.2), 2019. https://CRAN.R-project.org/package=cmocean.

The following references provide information on choosing colour schemes, that are suitable for viewers who have colour deficiencies.

Light, Adam, and Patrick J. Bartlein. "The End of the Rainbow? Color Schemes for Improved Data Graphics." Eos, Transactions American Geophysical Union 85, no. 40 (2004): 385. DOI: 10.1029/2004EO400002

Stephenson, David B. "Comment on 'Color Schemes for Improved Data Graphics', by A Light and P.J. Bartlein." Eos, Transactions American Geophysical Union 86, no. 20 (2005): 196. DOI: 10.1029/2005EO200005

Light, Adam, and Patrick J. Bartlein. "Reply to 'Comment on Color Schemes for Improved Data Graphics,' by A. Light and P.J. Bartlein'." Eos, Transactions American Geophysical Union 86, no. 20 (2005): 196–196. DOI: 10.1029/2005EO200006

### See Also

Other things related to colors: `colormapGMT()`, `colormap()`, `oceColors9B()`, `oceColorsCDOM()`, `oceColorsChlorophyll()`, `oceColorsClosure()`, `oceColorsFreesurface()`, `oceColorsGebco()`, `oceColorsJet()`, `oceColorsOxygen()`, `oceColorsPAR()`, `oceColorsPalette()`, `oceColorsPhase()`, `oceColorsSalinity()`, `oceColorsTemperature()`, `oceColorsTurbidity()`, `oceColorsTurbo()`, `oceColorsTwo()`, `oceColorsVelocity()`, `oceColorsViridis()`, `oceColorsVorticity()`, `ocecolors`

### Examples

    library(oce)

    # Example 1
    imagep(volcano, col=oceColorsDensity(128),
           zlab="oceColorsDensity")
    ## Not run:
    # Example 2 (requires the cmocean package)
    imagep(volcano, col=cmocean::cmocean("matter"),
           zlab='cmocean::cmocean("matter")')
    ## End(Not run)

    ## Not run:
    # Example 3 (requires the viridis package)
    imagep(volcano, col=viridis::inferno,
           zlab='viridis::inferno')
    ## End(Not run)

[Package oce version 1.7-2 Index]