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r.shade(1grass)


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

SEE ALSO

    r.his, d.his, d.shade, g.pnmcomp, r.slope.aspect, r.relief

AUTHORS

   Hamish Bowman
   Vaclav Petras, NCSU OSGeoREL
   Inspired by d.shade and manual for r.his.

   Last changed: $Date: 2015-09-02 13:01:34 +0200 (Wed, 02 Sep 2015) $

SOURCE CODE

   Available at: r.shade source code (history)

   Main index | Raster index | Topics index | Keywords index  |  Graphical
   index | Full index

    2003-2016 GRASS Development Team, GRASS GIS 7.2.0 Reference Manual



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