r.width.funct - GRASS GIS manual

Note: This addon document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade your GRASS GIS installation, and read the current addon manual page.

NAME

r.width.funct - Calculates the Width Function of a watershed basin.

KEYWORDS

raster, hydrology

SYNOPSIS

r.width.funct

r.width.funct --help

r.width.funct map=name image=image [--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:

map=name [required]: Distance to outlet map (from r.stream.distance)
image=image [required]: Name for output graph file (png)

DESCRIPTION
- Input
- Output
EXAMPLE
- Dependencies
SEE ALSO
REFERENCES
AUTHORS

DESCRIPTION

r.width.funct produces the Width Function of a basin. The Width Function W(x) gives the number of the cells in a basin at a flow distance x from the outlet (it is also referred as distance-area function). It is important to underline the fact that the distance is not the euclidean one, but it is measured along the flowpath towards the outlet.

g.region raster=elevation -p

# Calculate flow direction
r.stream.extract elevation=elevation threshold=1000 \
direction=direction 

# Create outlet point 
echo "637304.924954,218617.100523" | v.in.ascii input=- sep=',' out=outlet

# Convert outlet point to raster
v.to.rast input=outlet type=point output=outlet use=cat

# Calculate distance to outlet map
r.stream.distance -o stream_rast=outlet \
direction=direction distance=dist2out

# Calculate width function
r.width.funct map=dist2out image=/tmp/my_basin

Dependencies

Matplotlib

REFERENCES

Rodriguez-Iturbe I., Rinaldo A. — Fractal River Basins, Chance and Self-Organization. Cambridge Press (2001)
In Italian: Di Leo M., Di Stefano M., Claps P., Sole A. — Caratterizzazione morfometrica del bacino idrografico in GRASS GIS (Morphometric characterization of the catchment in GRASS GIS environment), Geomatics Workbooks, n. 9 (2010)

AUTHORS

Margherita Di Leo (grass-dev AT lists DOT osgeo DOT org), Massimo Di Stefano, Francesco Di Stefano

SOURCE CODE

Available at: r.width.funct source code (history)

Latest change: Mon Jun 28 07:54:09 2021 in commit: 1cfc0af029a35a5d6c7dae5ca7204d0eb85dbc55