r.usler - GRASS GIS manual
Author: GRASS Development Team
Description: r.usler: Computes USLE R factor, Rainfall erosivity index.
Keywords: raster, hydrology, rainfall, soil, erosion

## NAME

r.usler - Computes USLE R factor, Rainfall erosivity index.

## KEYWORDS

raster, hydrology, rainfall, soil, erosion

## SYNOPSIS

r.usler
r.usler --help
r.usler input=name output=name method=string [--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:

input=name [required]
  Name of annual precipitation raster map [mm/year]
output=name [required]
  Name for output USLE R raster map [MJ.mm/ha.hr.year]
method=string [required]
  Name of USLE R equation
  Options: roose, morgan, foster, elswaify
  Default: morgan
  roose: Roosle (1975)
  morgan: Morgan (1974)
  foster: Foster (1981)
  elswaify: El-Swaify (1985)

## DESCRIPTION

r.usler calculates USLE R factor for Rainfall erosivity. It enables several empirical equations: Roosle (1975), Morgan (1974), Foster(1981) and El-Swaify (1985).

## NOTES

r.watershed provides for USLE L, S, LS factors.

## EXAMPLE

TBD.

## SEE ALSO

r.uslek, r.watershed

## AUTHORS

Natialia Medvedeva, SIC-ISDC, Ashgabat, Turkmenistan
Yann Chemin, SIC-ISDC, Ashgabat, Turkmenistan

## SOURCE CODE

Available at: r.usler source code (history)

Accessed: Thursday Jun 04 03:31:05 2026

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