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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

Table of contents

DESCRIPTION

r.threshold finds optimal threshold for stream extraction.

NOTES

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.

EXAMPLE

r.threshold acc=accumulation_map

SEE ALSO

r.stream.extract, r.watershed

AUTHOR

Margherita Di Leo (dileomargherita AT gmail DOT com)

Last changed: $Date: 2012-04-10 20:51:23 +0200 (Tue, 10 Apr 2012) $

SOURCE CODE

Available at: r.threshold source code (history)

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© 2003-2018 GRASS Development Team, GRASS GIS 7.4.1svn Reference Manual