i.spectral(1grass)

Usage

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]

Keywords

imagery, querying, raster, multispectral

Overview

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.

Examples

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.

Source code

Available at: i.spectral source code (history)

Accessed: Monday Feb 24 17:51:44 2025

Releases

10 releases since Debian 4.0 (Etch); the text changed 9 times.

4.0
5.0
6.0
7
8
9
10
11
12
13