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r.basins.fill(1grass) GRASS GIS User's Manual r.basins.fill(1grass)


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


raster, hydrology, watershed


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


Allow output files to overwrite existing files

Print usage summary

Verbose module output

Quiet module output

Force launching GUI dialog


Name of input coded stream network raster map

Name of input thinned ridge network raster map

Name for output raster map

Number of passes through the dataset


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.


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


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


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


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

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© 2003-2020 GRASS Development Team, GRASS GIS 7.8.5 Reference Manual

GRASS 7.8.5