NAME

       r.carve   - Takes vector stream data, transforms it to raster and subtracts depth from the
       output DEM.

KEYWORDS

       raster, hydrology

SYNOPSIS

       r.carve
       r.carve help
       r.carve   [-nq]   rast=name   vect=name   output=name     [points=name]      [width=float]
       [depth=float]   [--overwrite]  [--verbose]  [--quiet]

   Flags:
       -n
           No flat areas allowed in flow direction

       -q
           Run quietly

       --overwrite
           Allow output files to overwrite existing files

       --verbose
           Verbose module output

       --quiet
           Quiet module output

   Parameters:
       rast=name
           Name of input raster elevation map

       vect=name
           Name of vector input map containing stream(s)

       output=name
           Name for output raster map

       points=name
           Name for output vector map for adjusted stream points

       width=float
           Stream width (in meters). Default is raster cell width

       depth=float
           Additional stream depth (in meters)

DESCRIPTION

       r.carve  accepts  vector  stream data as input, transforms them to raster, and subtracts a
       defaultdepth+additionaldepth from a DEM. If the given width is more than 1 cell,  it  will
       carve the stream with the given width. With the -n flag it should eliminate all flat cells
       within the stream, so when and if the water gets into the stream it will flow. The  points
       option  generates  x,y,z for points which define the stream with the z-value of the bottom
       of the carved-in stream. These points can then be combined with contours to interpolate  a
       new DEM with better representation of valleys.

NOTE

       r.carve  does  not  create a depressionless DEM because many depressions are in flat areas
       and not in the streams.

EXAMPLE

       g.region rast=elevation.10m -p
       r.carve rast=elevation.10m vect=streams out=carve_dem width=20 depth=5

BUGS

       The module does not  operate  yet  in  latitude-longitude  locations.   It  has  not  been
       thoroughly tested, so not all options may work properly - but this was the intention.

REFERENCES

       Terrain  modeling  and Soil Erosion Simulations for Fort Hood and Fort Polk test areas, by
       Helena Mitasova, Lubos Mitas, William M. Brown, Douglas M.   Johnston,  GMSL  (Report  for
       CERL 1999)

SEE ALSO

       r.flow, r.fill.dir, r.watershed

AUTHOR

       Bill Brown (GMSL)
       GRASS 6 update: Brad Douglas

       Last changed: $Date: 2008-05-16 12:09:06 -0700 (Fri, 16 May 2008) $

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