GRASS logo

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.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)

SOURCE CODE

Available at: r.threshold source code (history)

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


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.

Main index | Raster index | Topics index | Keywords index | Graphical index | Full index

© 2003-2022 GRASS Development Team, GRASS GIS 7.8.8dev Reference Manual