1r.water.outlet(1)             Grass User's Manual            r.water.outlet(1)
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NAME

6       r.water.outlet  - Watershed basin creation program.
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KEYWORDS

SYNOPSIS

10       r.water.outlet
11       r.water.outlet help
12       r.water.outlet   drainage=string   basin=string   easting=x  northing=y
13       [--overwrite]  [--verbose]  [--quiet]
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15   Flags:
16       --overwrite
17           Allow output files to overwrite existing files
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19       --verbose
20           Verbose module output
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22       --quiet
23           Quiet module output
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25   Parameters:
26       drainage=string
27           Name of input raster map
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29       basin=string
30           Name of raster map to contain results
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32       easting=x
33           The map E grid coordinates
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35       northing=y
36           The map N grid coordinates
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DESCRIPTION

39       r.water.outlet generates a watershed basin from  a  drainage  direction
40       map (from r.watershed) and a set of coordinates representing the outlet
41       point of watershed.
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43   Selected Parameters
44       drainage=name
45              Input map: drainage direction. Indicates the "aspect"  for  each
46              cell.  Multiplying positive values by 45 will give the direction
47              in degrees that the surface runoff will travel from  that  cell.
48              The  value  -1  indicates  that  the  cell is a depression area.
49              Other negative values indicate that surface  runoff  is  leaving
50              the  boundaries  of  the current geographic region. The absolute
51              value of these negative cells indicates the direction  of  flow.
52              This map is generated from r.watershed.
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54       basin=name
55              Output map: Values of one (1) indicate the watershed basin. Val‐
56              ues of zero are not in the watershed basin.
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58       easting=value
59              Input value: Easting value of outlet point.
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61       northing=value
62              Input value: Northing value of outlet point.
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NOTES

65       In the context of  this  program,  a  watershed  basin  is  the  region
66       upstream  of an outlet point. Thus, if the user chooses an outlet point
67       on a hill slope, the resulting map will be a thin silver of land repre‐
68       senting the overland slope uphill of the point.
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SEE ALSO

71        d.where, r.watershed, r.topidx
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AUTHOR

74       Charles Ehlschlaeger, U.S. Army Construction Engineering Research Labo‐
75       ratory
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77       Last changed: $Date: 2003-05-06 18:32:01 +0200 (Tue, 06 May 2003) $
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79       Full index
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81       © 2003-2008 GRASS Development Team
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85GRASS 6.3.0                                                  r.water.outlet(1)