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

9       raster
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SYNOPSIS

12       r.water.outlet
13       r.water.outlet help
14       r.water.outlet   drainage=string   basin=string   easting=x  northing=y
15       [--overwrite]
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17   Flags:
18       --overwrite
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20   Parameters:
21       drainage=string
22           Name of input raster map
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24       basin=string
25           Name of raster map to contain results
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27       easting=x
28           The map E  grid coordinates
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30       northing=y
31           The map N grid coordinates
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DESCRIPTION

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

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

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

69       Charles Ehlschlaeger, U.S. Army Construction Engineering Research Labo‐
70       ratory
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72       Last changed: $Date: 2003/05/06 16:30:09 $
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74       Full index
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78GRASS 6.2.2                                                  r.water.outlet(1)