NAME
r.width.funct - Calculates the Width Function of a watershed basin.KEYWORDS
raster, hydrologySYNOPSIS
r.width.funct
r.width.funct --helpr.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)
Table of contents
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.Input
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.
Output
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.EXAMPLE
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
Dependencies
- Matplotlib
SEE ALSO
r.stream.distance, r.basin,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 StefanoLast changed: $Date: 2017-08-10 09:17:10 +0200 (Thu, 10 Aug 2017) $
SOURCE CODE
Available at: r.width.funct source code (history)
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