---
name: "r.usler"
section: "1grass"
platform: "linux"
package: "grass-doc"
version: "8.4.1-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/r.usler"
---

# r.usler(1grass)

Computes USLE R factor, Rainfall erosivity index.

## 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: Monday Feb 24 17:50:56 2025

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