r.shadegrass - Online in the Cloud

PROGRAM:

NAME

r.shade - Drapes a color raster over an shaded relief or aspect map.

KEYWORDS

raster, elevation, relief, hillshade, visualization

SYNOPSIS

r.shade
r.shade --help
r.shade [-c] shade=name color=name output=name [brighten=integer] [bgcolor=name]
[--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:
-c
Use colors from color tables for NULL values

--overwrite
Allow output files to overwrite existing files

--help
Print usage summary

--verbose
Verbose module output

--quiet
Quiet module output

--ui
Force launching GUI dialog

Parameters:
shade=name [required]
Name of shaded relief or aspect raster map

color=name [required]
Name of raster to drape over relief raster map
Typically, this raster is elevation or other colorful raster

output=name [required]
Name of shaded raster map

brighten=integer
Percent to brighten
Options: -99-99
Default: 0

bgcolor=name
Color to use instead of NULL values
Either a standard color name, R:G:B triplet, or "none"

DESCRIPTION

r.shade will drape a color raster map over a shaded relief map. In place of shaded
relief, any raster map can be used including aspect or slope. The color raster map is
usually an elevation raster map with colorful color table (as opposed to gray scale color
table). However, any raster map can be used including categorical raster maps. The result
is a raster map created from elevation and the shade raster.

Comparing to creating shaded relief as semi-transparent overlay on the color raster map,
this module gives result with more saturated colors.

The input for this module can be created for example using r.slope.aspect or r.relief.

NULL values are propagated by default, so if any of the two input rasters contains NULL
cell NULL will be also in the output. If -c flag is used and cell in color raster is NULL,
just shade color is used. If cell in shade raster is NULL, shading effect is not applied
and original colors are used. If bgcolor option is used, NULL value in any input raster
will be in the output replaced by the given color.

NOTES

Refer to the r.his help page for more details; r.shade is a frontend to that module with
addition of brightness support similar to one provided by d.shade. However, note that the
brightness is not implemenented in the same way as for d.shade and the results might be
different. r.shade is using method described in r.his manual page.

EXAMPLES

In this example, the aspect map in the North Carolina sample dataset location is used to
hillshade the elevation map:
g.region raster=aspect -p
r.shade shade=aspect color=elevation output=elevation_aspect_shaded
d.mon wx0
d.rast elevation_aspect_shaded
In this next example, a shaded relief raster map is created and used to create a colorized
hillshade raster map for later use:
g.region raster=elevation
r.relief input=elevation output=elevation_shaded_relief
r.shade shade=elevation_shaded_relief color=elevation \
output=elevation_relief_shaded
d.mon wx1
d.rast elevation_relief_shaded
Interesting visualizations can be created using different color tables for elevation
raster map, for example using haxby color table.

Figure: A detail of raster created by applying shading effect of shaded relief (hillshade)
to elevation raster map from North Carolina dataset elevation map

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