r.slopeunits.create - GRASS GIS manual

NAME

r.slopeunits.create - Create a raster layer of slope units

KEYWORDS

SYNOPSIS

r.slopeunits.create

r.slopeunits.create --help

r.slopeunits.create [-gs] demmap=name [plainsmap=name] slumap=name [slumapvect=name] [circvarmap=name] [areamap=name] thresh=float areamin=float [areamax=float] cvmin=float rf=integer maxiteration=integer [generalize_treshold=float] [convergence=integer] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

-g: Generalize Slope Units vector layer
-s: SFD (D8) flow in r.watershed (default is MFD); SFD: single flow direction, MFD: multiple flow direction
--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:

demmap=name [required]: Input digital elevation model
plainsmap=name: Input raster map of alluvial plains
slumap=name [required]: Output Slope Units layer (the main output)
slumapvect=name: Output Slope Units layer as vector layer
circvarmap=name: Output Circular Variance layer
areamap=name: Output Area layer; values in square meters
thresh=float [required]: Initial threshold (m^2).
areamin=float [required]: Minimum area (m^2) below which the slope unit is not further segmented
areamax=float: Maximum area (m^2) above which the slope unit is segmented irrespective of aspect
cvmin=float [required]: Minimum value of the circular variance (0.0-1.0) below which the slope unit is not further segmented
rf=integer [required]: Factor used to iterativelly reduce initial threshold: newthresh=thresh-thresh/reductionfactor
maxiteration=integer [required]: maximum number of iteration to do before the procedure is in any case stopped
generalize_treshold=float: Threshold for maximal tolerance value for v.generalize; Options: 0-1000000000; Default: 20
convergence=integer: Convergence factor for MFD in r.watershed (1-10); 1 = most diverging flow, 10 = most converging flow. Recommended: 5; Default: 5

DESCRIPTION
NOTES
EXAMPLE
SEE ALSO
AUTHORS

DESCRIPTION

r.slopeunits.create creates a raster layer of slope units. Optionally, a vector map can be created.

NOTES

EXAMPLE

r.slopeunits.create \
    demmap=dem_italia_isolegrandi@su_test \
    plainsmap=flat \
    slumap=su_tmp \
    thresh=250000 \
    areamin=200000 \
    cvmin=0.25 \
    rf=2 \
    maxiteration=50

AUTHORS

Main authors: Ivan Marchesini, Massimiliano Alvioli, CNR-IRPI
Markus Metz (refactoring), mundialis

SOURCE CODE

Available at: r.slopeunits.create source code (history)

Latest change: Wednesday Jan 22 09:08:05 2025 in commit: 716d827ce825ef48b41cedc17e8801b5973bd05c