NAMEr.carve - Takes vector stream data, transforms it to raster and subtracts depth from the output DEM.
SYNOPSISr.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)
DESCRIPTIONr.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.
NOTEr.carve does not create a depressionless DEM because many depressions are in flat areas and not in the streams.
EXAMPLEg.region rast=elevation.10m -p r.carve rast=elevation.10m vect=streams out=carve_dem width=20 depth=5
BUGSThe 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.
REFERENCESTerrain 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 ALSOr.flow, r.fill.dir, r.watershed
AUTHORBill Brown (GMSL) GRASS 6 update: Brad Douglas Last changed: $Date: 2008-05-16 21:09:06 +0200 (Fri, 16 May 2008) $ Full index (C) 2003-2010 GRASS Development Team R.CARVE(1)