## DESCRIPTION

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

## NOTES

This script requires the launch of one of the supported monitors (cairo, png, ps) or gnuplot to be installed.

## EXAMPLE

Analysis of LANDSAT TM7 channels (North Carolina dataset):

    g.region raster=lsat7_2002_10 -p
    i.spectral -g raster=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=","`
    d.mon start=cairo output=plot.png
    i.spectral raster=$LIST coordinates=637502.25,221744.25
    d.mon stop=cairo

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, Cairo driver, PNG driver, PS driver (Postscript)

## AUTHORS

Markus Neteler
Francesco Pirotti