i.spectral.1grass man page

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 [-cg] [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
--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
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 00:50:11 +0100 (Sat, 27 Dec 2014) $

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