i.lmf - GRASS GIS manual

NAME

i.lmf - Performs Temporal Local Maximum Fitting of vegetation indices, works also for surface reflectance data.

KEYWORDS

imagery, LMF, Vegetation Indices, Atmospheric correction, Temporal

SYNOPSIS

i.lmf

i.lmf --help

i.lmf input=name[,name,...] ndate=integer output=name [--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[,name,...] [required]: Names of input layers
ndate=integer [required]: Number of map layers per year
output=name [required]: Name of the output layer

DESCRIPTION
NOTES
TODO
SEE ALSO
AUTHOR

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.

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.

AUTHOR

Yann Chemin, International Rice Research Institute, The Philippines

SOURCE CODE

Available at: i.lmf source code (history)

Latest change: Monday Jan 30 19:49:11 2023 in commit: 5fb6b1a969e72db28df78483d3360b15a17f0c68