## NAME

r.basins.fill - Generates a raster map layer showing watershed subbasins.
(GRASS Raster Program)

## SYNOPSIS

r.basins.fill
r.basins.fill help
r.basins.fill number=value c_map=name t_map=name result=name

## 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, either through digitizing done in v.digit, or through the on-screen digitizing option accessible within d.display.

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 user can run r.basins.fill either interactively or non-interactively. If the user simply types r.basins.fill without other arguments on the command line, the program will prompt the user for the needed parameters using the standard GRASS parser interface.

If the user wishes to run the program non-interactively, the following parameter values must be specified on the command line:

### Parameters:

number=value
  The number of passes to be made through the dataset.
c_map=name
  The coded stream network file name.
t_map=name
  The thinned ridge network file name.
result=name
  The resultant watershed partition file name.

## 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.

d.display
r.watershed
v.digit
parser

## AUTHORS

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

Last changed: $Date: 2002/01/25 05:45:34 $