r.threshold - GRASS GIS manual

NAME

r.threshold - Find optimal threshold for stream extraction

KEYWORDS

raster, hydrology, threshold

SYNOPSIS

r.threshold

r.threshold --help

r.threshold [-g] acc=acc [--help] [--verbose] [--quiet] [--ui]

Flags:

-g: Print the threshold value in shell script style
--help: Print usage summary
--verbose: Verbose module output
--quiet: Quiet module output
--ui: Force launching GUI dialog

Parameters:

acc=acc [required]: Name of accumulation raster map

DESCRIPTION
NOTES
EXAMPLE
SEE ALSO
AUTHOR

DESCRIPTION

r.threshold finds optimal threshold for stream extraction.

The module finds a first tentative value of upslope area to be used as input to extract the river network using r.stream.extract or r.watershed. Real streams depend on many factors, such as rainfall, infiltration rate, geology, climate etc. i.e. the same topography in different parts of the world yields different real stream networks. This approach provides a best guess about what makes sense when looking only at the DEM.