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v.colors(1) Grass User's Manual v.colors(1)

v.colors - Creates/modifies the color table associated with a vector map.

vector, color table

v.colors --help
v.colors [-rwlngac] map=name [layer=string] use=string [column=name] [ range=min,max] [color=style] [ raster=name] [raster_3d=name] [ rules=name] [rgb_column=name] [--help] [--verbose] [--quiet] [-- ui]

Remove existing color table
Only write new color table if it does not already exist
List available rules then exit
Invert colors
Logarithmic scaling
Logarithmic-absolute scaling
Convert color rules from RGB values to color table
Option ’rgb_column’ with valid RGB values required
Print usage summary
Verbose module output
Quiet module output
Force launching GUI dialog

map=name [required]
Name of vector map
Or data source for direct OGR access
Layer number or name
Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.
Default: 1
use=string [required]
Source values
Options: attr, cat, z
Default: cat
attr: read values from attribute table (requires <column> option)
cat: use category values
z: use z coordinate (3D points or centroids only)
Name of column containing numeric data
Required for use=attr
Manually set range (refers to ’column’ option)
Ignored when ’rules’ given
Name of color table
Options: aspect, aspect.bak, aspectcolr, aspectcolr.bak, bcyr, bcyr.bak, bgyr, bgyr.bak, blues, blues.bak, byg, byg.bak, byr, byr.bak, celsius, celsius.bak, corine, corine.bak, curvature, curvature.bak, differences, differences.bak, elevation, elevation.bak, etopo2, etopo2.bak, evi, evi.bak, fahrenheit, fahrenheit.bak, gdd, gdd.bak, grass, grass.bak, greens, greens.bak, grey, grey.bak, grey.eq, grey.log, grey1.0, grey1.0.bak, grey255, grey255.bak, gyr, gyr.bak, haxby, haxby.bak, kelvin, kelvin.bak, ndvi, ndvi.bak, ndwi, ndwi.bak, oranges, oranges.bak, population, population.bak, population_dens, population_dens.bak, precipitation, precipitation.bak, precipitation_daily, precipitation_daily.bak, precipitation_monthly, precipitation_monthly.bak, rainbow, rainbow.bak, ramp, ramp.bak, random, reds, reds.bak, roygbiv, roygbiv.bak, rstcurv, rstcurv.bak, ryb, ryb.bak, ryg, ryg.bak, sepia, sepia.bak, slope, slope.bak, soilmoisture, soilmoisture.bak, srtm, srtm.bak, srtm_plus, srtm_plus.bak, terrain, terrain.bak, viridis, viridis.bak, water, water.bak, wave, wave.bak
aspect: aspect oriented grey colors
aspect.bak: no description
aspectcolr: aspect oriented rainbow colors
aspectcolr.bak: no description
bcyr: blue through cyan through yellow to red
bcyr.bak: no description
bgyr: blue through green through yellow to red
bgyr.bak: no description
blues: white to blue
blues.bak: no description
byg: blue through yellow to green
byg.bak: no description
byr: blue through yellow to red
byr.bak: no description
celsius: blue to red for degree Celsius temperature
celsius.bak: no description
corine: EU Corine land cover colors
corine.bak: no description
curvature: for terrain curvatures (from and r.slope.aspect)
curvature.bak: no description
differences: differences oriented colors
differences.bak: no description
elevation: maps relative ranges of raster values to elevation color ramp
elevation.bak: no description
etopo2: colors for ETOPO2 worldwide bathymetry/topography
etopo2.bak: no description
evi: enhanced vegetative index colors
evi.bak: no description
fahrenheit: blue to red for Fahrenheit temperature
fahrenheit.bak: no description
gdd: accumulated growing degree days
gdd.bak: no description
grass: GRASS GIS green (perceptually uniform)
grass.bak: no description
greens: white to green
greens.bak: no description
grey: grey scale
grey.bak: no description
grey.eq: histogram-equalized grey scale
grey.log: histogram logarithmic transformed grey scale
grey1.0: grey scale for raster values between 0.0-1.0
grey1.0.bak: no description
grey255: grey scale for raster values between 0-255
grey255.bak: no description
gyr: green through yellow to red
gyr.bak: no description
haxby: relative colors for bathymetry or topography
haxby.bak: no description
kelvin: blue to red for temperature in Kelvin scale
kelvin.bak: no description
ndvi: Normalized Difference Vegetation Index colors
ndvi.bak: no description
ndwi: Normalized Difference Water Index colors
ndwi.bak: no description
oranges: white to orange
oranges.bak: no description
population: color table covering human population classification breaks
population.bak: no description
population_dens: color table covering human population density classification breaks
population_dens.bak: no description
precipitation: precipitation color table (0..2000mm)
precipitation.bak: no description
precipitation_daily: precipitation color table (0..1000mm)
precipitation_daily.bak: no description
precipitation_monthly: precipitation color table (0..1000mm)
precipitation_monthly.bak: no description
rainbow: rainbow color table
rainbow.bak: no description
ramp: color ramp
ramp.bak: no description
random: random color table
reds: white to red
reds.bak: no description
roygbiv: no description
roygbiv.bak: no description
rstcurv: terrain curvature (from r.resamp.rst)
rstcurv.bak: no description
ryb: red through yellow to blue
ryb.bak: no description
ryg: red through yellow to green
ryg.bak: no description
sepia: yellowish-brown through to white
sepia.bak: no description
slope: r.slope.aspect-type slope colors for raster values 0-90
slope.bak: no description
soilmoisture: soilmoisture color table (0.0-1.0)
soilmoisture.bak: no description
srtm: color palette for Shuttle Radar Topography Mission elevation
srtm.bak: no description
srtm_plus: color palette for Shuttle Radar Topography Mission elevation (with seafloor colors)
srtm_plus.bak: no description
terrain: global elevation color table covering -11000 to +8850m
terrain.bak: no description
viridis: perceptually uniform sequential color table viridis
viridis.bak: no description
water: water depth
water.bak: no description
wave: color wave
wave.bak: no description
Raster map from which to copy color table
3D raster map from which to copy color table
Path to rules file
Name of color column to populate RGB values
If not given writes color table

v.colors allows creating or modifying color table associated with a vector map similarly to r.colors for raster maps.
Color rules are built from features category values ( use=cat) or numeric data column ( use=attr) defined by column option. For 3D vector maps is allowed to define color rules based on points or centroids z-coordinate ( use=z). 3D vector lines are not supported.
The raster option allows user to specify a raster map from which to copy the color table, similarly raster_3d option for 3D raster map.
The rules color table type will cause v.colors to read color table specifications from given file and will build the color table accordingly. See r.colors manual page for details.
If the user specifies the -w flag, the current color table file for the input map will not be overwritten. This means that the color table is created only if the vector map does not already have a color table. If this option is not specified, the color table will be created if one does not exist, or modified if it does.
Alternatively the color rules can be stored in a string column ( rgb_column) by saving the RRR:GGG:BBB values suitable for use with d.vect.

For vector maps with a large number of features it’s more convenient to store color rules in an attribute column (given by rgb_column) rather then in a color table file. Reading color tables with more then 1000 items is slow.

Define color table wave based on categories from layer 1
v.colors map=soils_general layer=1 color=wave

Define color table ryg based on values from attribute column AREA. Attribute table is linked to layer 1. map=soils_general layer=1 option=area column=AREA
v.colors map=soils_general layer=1 color=wave use=attr column=AREA

Write color values to the attribute table (column GRASSRGB) instead of creating color table.
v.colors map=soils_general layer=1 color=wave use=attr column=AREA rgb_column=GRASSRGB
# See some GRASSRGB values: map=soils_general where="cat < 4"

Convert existing RGB values to color table rules.
v.colors -c map=soils_general rgb_column=GRASSRGB
Note that in this case the vector map has a proper color table assigned (check by v.colors.out) together with GRASSRGB attribute column. Also note that color table is preferred over RGB values stored in attribute table.

Existing color table can be removed by -r flag.
v.colors -r map=soils_general
Before removing color table you can store color rules to the file by v.colors.out and later to assign by rules option.
v.colors.out map=soils_general rules=soils.colr
v.colors map=soils_general rules=soils.colr
To drop RGB column use v.db.dropcolumn.
v.db.dropcolumn map=soils_general column=GRASSRGB

d.vect, r.colors, r.colors.out, r3.colors, r3.colors.out, v.colors.out
See also wiki page Color tables (from GRASS User Wiki)
ColorBrewer is an online tool designed to help people select good color schemes for maps and other graphics.

Martin Landa, OSGeoREL, Czech Technical University in Prague, Czech Republic
Last changed: $Date: 2015-02-13 16:14:07 +0100 (Fri, 13 Feb 2015) $

Available at: v.colors source code (history)
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© 2003-2018 GRASS Development Team, GRASS GIS 7.4.3 Reference Manual
GRASS 7.4.3

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