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