grass_db: GRASS color tables
In dieghernan/tidyterra: 'tidyverse' Methods and 'ggplot2' Helpers for 'terra' Objects

grass_db

R Documentation

GRASS color tables

Description

A tibble including the color map of 51 gradient palettes. Some palettes includes also a definition of colors limits that can be used with ggplot2::scale_fill_gradientn().

Format

A tibble of 2920 rows and 6 columns. with the following fields:

pal: Name of the palette.
limit: (Optional) limit for each color.
r: Value of the red channel (RGB color mode).
g: Value of the green channel (RGB color mode).
b: Value of the blue channel (RGB color mode).
hex: Hex code of the color.

Details

Summary of palettes provided, description and recommended use:

palette	use	description	range
`aspect`	General	aspect oriented grey colors
`aspectcolr`	General	aspect oriented rainbow colors	0 to 360
`bcyr`	General	blue through cyan through yellow to red
`bgyr`	General	blue through green through yellow to red
`blues`	General	white to blue
`byg`	General	blue through yellow to green
`byr`	General	blue through yellow to red
`celsius`	General	blue to red for degree Celsius temperature	-80 to 80
`corine`	Land Cover	EU Corine land cover colors	111 to 995
`curvature`	General	for terrain curvatures	-0.1 to 0.1
`differences`	General	differences oriented colors
`elevation`	Topography	maps relative ranges of raster values to elevation color ramp
`etopo2`	Topography	colors for ETOPO2 worldwide bathymetry/topography	-11000 to 8850
`evi`	Natural	enhanced vegetative index colors	-1 to 1
`fahrenheit`	Temperature	blue to red for Fahrenheit temperature	-112 to 176
`forest_cover`	Natural	percentage of forest cover	0 to 1
`gdd`	Natural	accumulated growing degree days	0 to 6000
`grass`	General	GRASS GIS green (perceptually uniform)
`greens`	General	white to green
`grey`	General	grey scale
`gyr`	General	green through yellow to red
`haxby`	Topography	relative colors for bathymetry or topography
`inferno`	General	perceptually uniform sequential color table inferno
`kelvin`	Temperature	blue to red for temperature in Kelvin scale	193.15 to 353.15
`magma`	General	perceptually uniform sequential color table magma
`ndvi`	Natural	Normalized Difference Vegetation Index colors	-1 to 1
`ndwi`	Natural	Normalized Difference Water Index colors	-200 to 200
`nlcd`	Land Cover	US National Land Cover Dataset colors	0 to 95
`oranges`	General	white to orange
`plasma`	General	perceptually uniform sequential color table plasma
`population`	Human	color table covering human population classification breaks	0 to 1000000
`population_dens`	Human	color table covering human population density classification breaks	0 to 1000
`precipitation`	Climate	precipitation color table (0..2000mm)	0 to 7000
`precipitation_daily`	Climate	precipitation color table (0..1000mm)	0 to 100
`precipitation_monthly`	Climate	precipitation color table (0..1000mm)	0 to 1000
`rainbow`	General	rainbow color table
`ramp`	General	color ramp
`reds`	General	white to red
`roygbiv`	General
`rstcurv`	General	terrain curvature (from r.resamp.rst)	-0.1 to 0.1
`ryb`	General	red through yellow to blue
`ryg`	General	red through yellow to green
`sepia`	General	yellowish-brown through to white
`slope`	General	r.slope.aspect-type slope colors for raster values 0-90	0 to 90
`soilmoisture`	Natural	soil moisture color table (0.0-1.0)	0 to 1
`srtm`	Topography	color palette for Shuttle Radar Topography Mission elevation	-11000 to 8850
`srtm_plus`	Topography	color palette for Shuttle Radar Topography Mission elevation (with seafloor colors)	-11000 to 8850
`terrain`	Topography	global elevation color table covering -11000 to +8850m	-11000 to 8850
`viridis`	General	perceptually uniform sequential color table viridis
`water`	Natural	water depth
`wave`	General	color wave

terra equivalent

terra::map.pal()

Source

Derived from https://github.com/OSGeo/grass/tree/main/lib/gis/colors. See also r.color - GRASS GIS Manual.

References

GRASS Development Team (2024). Geographic Resources Analysis Support System (GRASS) Software, Version 8.3.2. Open Source Geospatial Foundation, USA. https://grass.osgeo.org.

Examples


data("grass_db")

grass_db
# Select a palette

srtm_plus <- grass_db %>%
  filter(pal == "srtm_plus")

f <- system.file("extdata/asia.tif", package = "tidyterra")
r <- terra::rast(f)

library(ggplot2)

p <- ggplot() +
  geom_spatraster(data = r) +
  labs(fill = "elevation")

p +
  scale_fill_gradientn(colors = srtm_plus$hex)

# Use with limits
p +
  scale_fill_gradientn(
    colors = srtm_plus$hex,
    values = scales::rescale(srtm_plus$limit),
    limit = range(srtm_plus$limit),
    na.value = "lightblue"
  )

dieghernan/tidyterra documentation built on Feb. 20, 2025, 4:18 p.m.