i.lmf
Performs Temporal Local Maximum Fitting of vegetation indices, works also for surface reflectance data.
i.lmf input=name [,name,...] ndate=integer output=name [--overwrite] [--verbose] [--quiet] [--qq] [--ui]
Example:
i.lmf input=name ndate=0 output=name
grass.script.run_command("i.lmf", input, ndate, output, overwrite=None, verbose=None, quiet=None, superquiet=None)
Example:
gs.run_command("i.lmf", input="name", ndate=0, output="name")
grass.tools.Tools.i_lmf(input, ndate, output, overwrite=None, verbose=None, quiet=None, superquiet=None)
Example:
tools = Tools()
tools.i_lmf(input="name", ndate=0, output="name")
This grass.tools API is experimental in version 8.5 and expected to be stable in version 8.6.
Parameters
input=name [,name,...] [required]
Names of input layers
ndate=integer [required]
Number of map layers per year
output=name [required]
Name of the output layer
--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 | list[str], required
Names of input layers
Used as: input, raster, name
ndate : int, required
Number of map layers per year
Used as: Atmospheric correction
output : str, required
Name of the output layer
Used as: output, raster, name
overwrite : bool, optional
Allow output files to overwrite existing files
Default: None
verbose : bool, optional
Verbose module output
Default: None
quiet : bool, optional
Quiet module output
Default: None
superquiet : bool, optional
Very quiet module output
Default: None
input : str | list[str], required
Names of input layers
Used as: input, raster, name
ndate : int, required
Number of map layers per year
Used as: Atmospheric correction
output : str | type(np.ndarray) | type(np.array) | type(gs.array.array), required
Name of the output layer
Used as: output, raster, name
overwrite : bool, optional
Allow output files to overwrite existing files
Default: None
verbose : bool, optional
Verbose module output
Default: None
quiet : bool, optional
Quiet module output
Default: None
superquiet : bool, optional
Very quiet module output
Default: None
Returns:
result : grass.tools.support.ToolResult | np.ndarray | tuple[np.ndarray] | None
If the tool produces text as standard output, a ToolResult object will be returned. Otherwise, None
will be returned. If an array type (e.g., np.ndarray) is used for one of the raster outputs, the result will be an array and will have the shape corresponding to the computational region. If an array type is used for more than one raster output, the result will be a tuple of arrays.
DESCRIPTION
i.lmf calculates the Local maximum fitting of a temporal image series, intially for vegetation indices, it also works for surface reflectance.
This is a first level port, only a fast fitting is done, see TODO.
The number of bands is potentially several years, nfiles and ndates are respectively the number of pixels and the number of pixels in a year.
NOTES
Original links are found here SAWADA, 2001: http://www.affrc.go.jp/ANDES/sawady/index.html NAGATANI et al., 2002: http://www.gisdevelopment.net/aars/acrs/2002/pos2/184.pdf Yann Chemin and Kiyoshi Honda repaired it and ported it from SGI/OpenMP to Linux. http://www.rsgis.ait.ac.th/\~honda/lmf/lmf.html
TODO
Port the full detailed algorithm from Fortran, and vastly unemcomber/clean it. It will make the algorithm must slower though, gaining only a marginal fitting strength, for my actual experience with VIs curves.
SEE ALSO
AUTHOR
Yann Chemin, International Rice Research Institute, The Philippines
SOURCE CODE
Available at: i.lmf source code
(history)
Latest change: Thursday Feb 20 13:02:26 2025 in commit 53de819