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            [-cg]             [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

       --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

       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 00:50:11 +0100 (Sat, 27 Dec 2014) $

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       © 2003-2016 GRASS Development Team, GRASS GIS 7.0.3 Reference Manual