i.sar.speckle

Remove speckle from SAR image

i.sar.speckle input=name output=name method=string size=integer [--overwrite] [--verbose] [--quiet] [--qq] [--ui]

Example:

i.sar.speckle input=name output=name method=lee size=11

grass.script.run_command("i.sar.speckle", input, output, method="lee", size=11, overwrite=False, verbose=False, quiet=False, superquiet=False)

Example:

gs.run_command("i.sar.speckle", input="name", output="name", method="lee", size=11)

Parameters

Command linePython (grass.script)

input=name [required]
    Name of input image
output=name [required]
    Name of output image
method=string [required]
    Method for speckle removal
    Allowed values: lee
    Default: lee
size=integer [required]
    Size of neighborhood
    Default: 11
--overwrite
    Allow output files to overwrite existing files
--help
    Print usage summary
--verbose
    Verbose module output
--quiet
    Quiet module output
--qq
    Very quiet module output
--ui
    Force launching GUI dialog

input : str, required
    Name of input image
    Used as: input, raster, name
output : str, required
    Name of output image
    Used as: output, raster, name
method : str, required
    Method for speckle removal
    Allowed values: lee
    Default: lee
size : int, required
    Size of neighborhood
    Default: 11
overwrite: bool, optional
    Allow output files to overwrite existing files
    Default: False
verbose: bool, optional
    Verbose module output
    Default: False
quiet: bool, optional
    Quiet module output
    Default: False
superquiet: bool, optional
    Very quiet module output
    Default: False

DESCRIPTION

A simple procedure to reduce speckle noise in SAR images.

So far, the only algorithm implemented is the Lee filter. So, the method parameter is set to lee by default.

The size parameter is the one used in r.neighbors and is used to calculate local mean and local square mean. It must be odd.

REFERENCES

Lee, J. S. (1986). Speckle suppression and analysis for synthetic aperture radar images. Optical engineering, 25(5), 255636.

AUTHOR

Margherita Di Leo

SOURCE CODE

Available at: i.sar.speckle source code (history)
Latest change: Thursday Feb 20 13:02:26 2025 in commit 53de819