NAMEr.water.outlet - Watershed basin creation program.
SYNOPSISr.water.outlet r.water.outlet help r.water.outlet drainage=string basin=string easting=x northing=y [--overwrite] [--verbose] [--quiet] Flags: --overwrite Allow output files to overwrite existing files --verbose Verbose module output --quiet Quiet module output Parameters: drainage=string Name of input raster map basin=string Name of raster map to contain results easting=x The map E grid coordinates northing=y The map N grid coordinates
DESCRIPTIONr.water.outlet generates a watershed basin from a drainage direction map (from r.watershed) and a set of coordinates representing the outlet point of watershed. Selected Parameters drainage=name Input map: drainage direction. Indicates the "aspect" for each cell. Multiplying positive values by 45 will give the direction in degrees that the surface runoff will travel from that cell. The value -1 indicates that the cell is a depression area. Other negative values indicate that surface runoff is leaving the boundaries of the current geographic region. The absolute value of these negative cells indicates the direction of flow. This map is generated from r.watershed. basin=name Output map: Values of one (1) indicate the watershed basin. Values of zero are not in the watershed basin. easting=value Input value: Easting value of outlet point. northing=value Input value: Northing value of outlet point.
NOTESIn the context of this program, a watershed basin is the region upstream of an outlet point. Thus, if the user chooses an outlet point on a hill slope, the resulting map will be a thin silver of land representing the overland slope uphill of the point.
SEE ALSOd.where, r.watershed, r.topidx
AUTHORCharles Ehlschlaeger, U.S. Army Construction Engineering Research Laboratory Last changed: $Date: 2008-05-16 21:09:06 +0200 (Fri, 16 May 2008) $ Full index (C) 2003-2010 GRASS Development Team R.WATER.OUTLET(1)