r.basins.fill(1)

NAME
r.basins.fill - Generates watershed subbasins raster map.

KEYWORDS
raster, hydrology, watershed

SYNOPSIS
r.basins.fill
r.basins.fill --help
r.basins.fill cnetwork=name tnetwork=name output=name number=integer [--overwrite] [--help] [--verbose] [--quiet] [--ui]

  Flags:

--overwrite
    Allow output files to overwrite existing files

--help
    Print usage summary

--verbose
    Verbose module output

--quiet
    Quiet module output

--ui
    Force launching GUI dialog

  Parameters:

cnetwork=name [required]
    Name of input coded stream network raster map

tnetwork=name [required]
    Name of input thinned ridge network raster map

output=name [required]
    Name for output raster map

number=integer [required]
    Number of passes through the dataset

DESCRIPTION
r.basins.fill generates a raster map layer depicting subbasins, based on input raster map layers for the coded stream network (where each channel segment has been "coded" with a unique category value) and for the ridges within a given watershed. The raster map layer depicting ridges should include the ridge which defines the perimeter of the watershed. The coded stream network can be generated as part of the r.watershed program, but the map layer of ridges will need to be created by hand (for example, through digitizing done in wxGUI vector digitizer).

The resulting output raster map layer will code the subbasins with category values matching those of the channel segments passing through them. A user-supplied number of passes through the data is made in an attempt to fill in these subbasins. If the resulting map layer from this program appears to have holes within a subbasin, the program should be rerun with a higher number of passes.

NOTES
The current geographic region setting is ignored. Instead, the geographic region for the entire input stream’s map layer is used.

SEE ALSO
See Appendix A of the GRASS Tutorial: r.watershed for further details on the combined use of r.basins.fill and r.watershed.

r.water.outlet, r.watershed, wxGUI vector digitizer

AUTHORS
Dale White, Dept. of Geography, Pennsylvania State University
Larry Band, Dept. of Geography, University of Toronto, Canada

SOURCE CODE

Available at: r.basins.fill source code (history)

Accessed: Sunday Jun 21 00:53:56 2026

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