Note: A new GRASS GIS stable version has been released: GRASS GIS 7, available here. And see the new manual page here
r.carve - Generates stream channels.
Takes vector stream data, transforms it to raster and subtracts depth from the output DEM.
r.carve [-nq] rast=name vect=name output=name [points=name] [width=float] [depth=float] [--overwrite] [--verbose] [--quiet]
- No flat areas allowed in flow direction
- Run quietly
- Allow output files to overwrite existing files
- Verbose module output
- Quiet module output
- Name of input raster elevation map
- Name of input vector map containing stream(s)
- Name for output raster map
- Name for output vector map for adjusted stream points
- Stream width (in meters)
- Default is raster cell width
- Additional stream depth (in meters)
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.
r.carve does not create a depressionless DEM because many
depressions are in flat areas and not in the streams.
g.region rast=elevation.10m -p
r.carve rast=elevation.10m vect=streams out=carve_dem width=20 depth=5
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.
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)
Bill Brown (GMSL)
GRASS 6 update: Brad Douglas
Last changed: $Date: 2014-03-15 07:28:47 -0700 (Sat, 15 Mar 2014) $
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