i.spectral (1)
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] [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
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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2003-2017 GRASS Development Team, GRASS GIS 7.2.1 Reference Manual