This is the command i.spectralgrass that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
PROGRAM:
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 [-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.
Use i.spectralgrass online using onworks.net services
