i.spectral.1grass - Man Page

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

Source Code

Available at: i.spectral source code (history)

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© 2003-2020 GRASS Development Team, GRASS GIS 7.8.5 Reference Manual

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