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i.spectral(1grass) Grass User's Manual i.spectral(1grass)

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

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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© 2003-2019 GRASS Development Team, GRASS GIS 7.6.0 Reference Manual

GRASS 7.6.0