i.wavelet

Decompostion/Recomposition in temporal dimension using wavelets

Command linePython (grass.script)

i.wavelet [-iHD] [input_group_to_decompose=name] [output_lp1_from_decomposition=name] [output_lp2_from_decomposition=name] [output_hp1_from_decomposition=name] [output_hp2_from_decomposition=name] [input_lp2_group_for_recomposition=name] [input_hp1_group_for_recomposition=name] [input_hp2_group_for_recomposition=name] [output_from_recomposition=name] [wavelet_sample_rate=integer] [--overwrite] [--verbose] [--quiet] [--qq] [--ui]

Example:

i.wavelet

grass.script.run_command("i.wavelet", input_group_to_decompose=None, output_lp1_from_decomposition=None, output_lp2_from_decomposition=None, output_hp1_from_decomposition=None, output_hp2_from_decomposition=None, input_lp2_group_for_recomposition=None, input_hp1_group_for_recomposition=None, input_hp2_group_for_recomposition=None, output_from_recomposition=None, wavelet_sample_rate=None, flags=None, overwrite=False, verbose=False, quiet=False, superquiet=False)

Example:

gs.run_command("i.wavelet")

Parameters

Command linePython (grass.script)

input_group_to_decompose=name
    Name of input imagery group
output_lp1_from_decomposition=name
    Name for output raster map
output_lp2_from_decomposition=name
    Name for output raster map
output_hp1_from_decomposition=name
    Name for output raster map
output_hp2_from_decomposition=name
    Name for output raster map
input_lp2_group_for_recomposition=name
    Name of input imagery group
input_hp1_group_for_recomposition=name
    Name of input imagery group
input_hp2_group_for_recomposition=name
    Name of input imagery group
output_from_recomposition=name
    Name of input raster map
wavelet_sample_rate=integer
    4,6,8,10,12,14,16,18,20
-i
    Recomposition (Default: Decomposition)
-H
    Use Haar wavelets
-D
    Use Daubechies wavelets (specify resolution=4,6,8,10,12,14,16,18,20
--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_group_to_decompose : str, optional
    Name of input imagery group
    Used as: input, group, name
output_lp1_from_decomposition : str, optional
    Name for output raster map
    Used as: output, raster, name
output_lp2_from_decomposition : str, optional
    Name for output raster map
    Used as: output, raster, name
output_hp1_from_decomposition : str, optional
    Name for output raster map
    Used as: output, raster, name
output_hp2_from_decomposition : str, optional
    Name for output raster map
    Used as: output, raster, name
input_lp2_group_for_recomposition : str, optional
    Name of input imagery group
    Used as: input, group, name
input_hp1_group_for_recomposition : str, optional
    Name of input imagery group
    Used as: input, group, name
input_hp2_group_for_recomposition : str, optional
    Name of input imagery group
    Used as: input, group, name
output_from_recomposition : str, optional
    Name of input raster map
    Used as: input, raster, name
wavelet_sample_rate : int, optional
    4,6,8,10,12,14,16,18,20
    Used as: integer
flags : str, optional
    Allowed values: i, H, D
    i
        Recomposition (Default: Decomposition)
    H
        Use Haar wavelets
    D
        Use Daubechies wavelets (specify resolution=4,6,8,10,12,14,16,18,20
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

i.wavelet Decomposes the time-series with the requested wavelet. The output will have 4 components, High-Pass Level 1 and 2, Low-Pass Level 1 and 2. Low Pass Level 1 can be recomposed using HP2 and LP2 using the recomposition mode.
This module is designed to make a temporal fusion from multi-sources.

NOTES

TODO

More wavelet families to be included.

SEE ALSO

r.hants, i.lmf

AUTHOR

Yann Chemin, International Water Management Institute

SOURCE CODE

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