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 (valid for -g flag)

       -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 is valid for -g (or text file for -t flag)

       format=string
           Graphics format for output file (valid for -g flag)
           Options: png, eps, svg
           Default: png

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

SOURCE CODE

       Available at: i.spectral source code (history)

       Accessed: Mon Jun 13 15:11:02 2022

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       © 2003-2022 GRASS Development Team, GRASS GIS 8.2.0 Reference Manual