i.spectral(1grass) GRASS GIS 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 (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: unknown
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GRASS 7.8.7 i.spectral(1grass)
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