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]          [subgroup=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

       subgroup=name
           Name of input imagery subgroup

       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

SOURCE CODE

       Available at: i.spectral source code (history)

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       © 2003-2019 GRASS Development Team, GRASS GIS 7.8.2 Reference Manual