Note: A new GRASS GIS stable version has been released: GRASS GIS 7.6, available here.
Updated manual page: here
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] [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
- 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
i.spectral displays spectral response at user specified
locations in images.
This script needs gnuplot to be installed.
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.
d.where,
r.what
Markus Neteler
Francesco Pirotti
Last changed: $Date: 2014-12-26 15:33:06 -0800 (Fri, 26 Dec 2014) $
SOURCE CODE
Available at: i.spectral source code (history)
Note: A new GRASS GIS stable version has been released: GRASS GIS 7.6, available here.
Updated manual page: here
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GRASS Development Team,
GRASS GIS 7.2.4svn Reference Manual