i.spectral(1)

NAME
i.spectral - Displays spectral response at user specified locations in group or images.

KEYWORDS
imagery, querying, raster, multispectral

SYNOPSIS
i.spectral
i.spectral --help
i.spectral [-cgt] [group=name] [raster=name[,name,...]] coordinates=east,north[,east,north,...] [output=name] [format=string] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

  Flags:

-c
    Show sampling coordinates instead of numbering in the legend

-g
    Use gnuplot for display

-t
    output to text file

--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:

group=name
    Name of input imagery group

raster=name[,name,...]
    Name of input raster map(s)

coordinates=east,north[,east,north,...] [required]
    Coordinates

output=name
    Name for output image (or text file for -t)

format=string
    Graphics format for output file
    Options: png, eps, svg
    Default: png

DESCRIPTION
i.spectral displays spectral response at user specified locations in images.

NOTES
This script needs gnuplot to be installed.

EXAMPLE
Analysis of LANDSAT TM7 channels (North Carolina dataset):

g.region raster=lsat7_2002_10 -p
i.spectral -g input=lsat7_2002_10,lsat7_2002_20,lsat7_2002_30,lsat7_2002_40,lsat7_2002_50,lsat7_2002_70 \
           coordinates=636069,215440,637958,223393,633277,223605

Spectral plot of 3 different land cover types: (1) water, (2) green vegetation, and (3) highway

North Carolina sample dataset:

g.region raster=lsat7_2002_10 -p
LIST=`g.list type=raster pattern="lsat7_2002_[1-5,7]0" separator=","`
i.spectral input=$LIST coordinates=637502.25,221744.25

This will search all LANDSAT map for 2002 but select only the B, G, R, NIR, and MIR channels.

SEE ALSO
d.where, r.what

AUTHOR
Markus Neteler
Francesco Pirotti

Last changed: $Date: 2014-12-27 00:33:06 +0100 (Sat, 27 Dec 2014) $

SOURCE CODE

Available at: i.spectral source code (history)

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© 2003-2016 GRASS Development Team, GRASS GIS 7.2.0 Reference Manual