i.spec.sam

Performs Spectral angle mapping on satellite/aerial images

i.spec.sam group=name input=name result=string [--verbose] [--quiet] [--qq] [--ui]

Example:

i.spec.sam group=name input=name result=string

grass.script.run_command("i.spec.sam", group, input, result, verbose=False, quiet=False, superquiet=False)

Example:

gs.run_command("i.spec.sam", group="name", input="name", result="string")

Parameters

Command linePython (grass.script)

group=name [required]
    Name of input imagery group
input=name [required]
    Matrix file containing spectral signatures
result=string [required]
    Raster map prefix to hold spectral angles
--help
    Print usage summary
--verbose
    Verbose module output
--quiet
    Quiet module output
--qq
    Very quiet module output
--ui
    Force launching GUI dialog

group : str, required
    Name of input imagery group
    Used as: input, group, name
input : str, required
    Matrix file containing spectral signatures
    Used as: input, file, name
result : str, required
    Raster map prefix to hold spectral angles
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.spec.sam is used to perform Spectral Angle Mapping.

Input matrix of signatures # Channels: r g b i1 i2 i3 # Enter spectra linewise! # 1. Sagebrush # 2. Saltbush # 3. Soil # 4. Dry grass # Matrix: 4 by 6 row0: 8.87 13.14 11.71 35.85 28.26 10.54 row1: 13.59 20.12 19.61 70.66 34.82 16.35 row2: 28.26 34.82 38.27 40.1 38.27 23.7 row3: 10.54 16.35 23.7 38.98 40.1 38.98

REFERENCES

Neteler, M., 1999: Spectral Mixture Analysis von Satellitendaten zur Bestimmung von Bodenbedeckungsgraden im Hinblick auf die Erosionsmodellierung. M.Sc. thesis, University of Hannover, Germany.
Neteler, M., D. Grasso, I. Michelazzi, L. Miori, S. Merler, and C. Furlanello, 2004. New image processing tools for GRASS. - In Proc. Free/Libre and Open Source Software for Geoinformatics: GIS-GRASS Users Conference, 12-14 Sep 2004, Bangkok, Thailand.
Neteler, M., D. Grasso, I. Michelazzi, L. Miori, S. Merler, and C. Furlanello, 2005. An integrated toolbox for image registration, fusion and classification. International Journal of Geoinformatics, 1(1), pp. 51-61. (PDF)

AUTHORS

Markus Neteler, University of Hannover, 1999
Updated to GRASS GIS 7: Yann Chemin, 2015

SOURCE CODE

Available at: i.spec.sam source code (history)
Latest change: Thursday Mar 20 21:36:57 2025 in commit 7286ecf