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)
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.
Distance to outlet map: Input map, required. It is obtained
by r.stream.distance (with the option: distance to outlet, flag -o).
Output plot: Path and name of the plot.
It provides the quantiles of the area - distance distribution and
the plot of the Width Function. In x axis is reported the distance
and in y axis is the area.
North Carolina sample dataset example:
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
r.stream.distance,
r.basin,
- 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)
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: Tuesday Nov 05 09:35:47 2024 in commit: f00067506253c89598cffadc3c7fa07cff7233fd
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GRASS Development Team,
GRASS GIS 8.4.1dev Reference Manual